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Grainger SA, Henry JD, Alister M, Bourdaniotis XE, Mead J, Bailey TG, Coombes JS, Vear N. Cardiorespiratory Fitness and Muscular Strength Do Not Predict Social Cognitive Capacity in Older Age. J Gerontol B Psychol Sci Soc Sci 2023; 78:1824-1833. [PMID: 37480568 PMCID: PMC10645310 DOI: 10.1093/geronb/gbad101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Indexed: 07/24/2023] Open
Abstract
OBJECTIVES Social cognitive function often declines in older age but the mechanisms underlying these declines are not completely clear. Cardiorespiratory fitness (CRF) and muscular strength are positively associated with broader cognitive function in older adults, yet surprisingly, no study has examined whether a similar relationship exists between CRF or muscular strength and social cognition in older age. METHODS We assessed whether higher CRF and muscular strength were associated with enhanced social cognitive function in a sample of fifty older adults (Mage = 70.08, standard deviation = 3.93). Participants completed a gold-standard cardiopulmonary exercise test to assess CRF, an isometric handgrip strength test to index muscular strength, and validated measures of social cognition to index emotion perception and theory of mind (ToM). RESULTS The results showed that CRF and muscular strength did not explain any unique variance in older adults' social cognitive performance. Bayesian analyses confirmed that the evidence for the null hypothesis was moderate for all tested relationships, except for the relationship between CRF and cognitive ToM where the evidence for the null was anecdotal. DISCUSSION This study has provided the first evidence to suggest that CRF and muscular strength-two important modifiable lifestyle factors-are not associated with social cognition in healthy older adults. However, replication studies are now needed to cross-validate these findings and to clarify whether any moderating variables may be important for understanding the relationship between fitness and social cognition in older age.
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Affiliation(s)
- Sarah A Grainger
- School of Psychology, University of Queensland, St Lucia, Queensland, Australia
| | - Julie D Henry
- School of Psychology, University of Queensland, St Lucia, Queensland, Australia
| | - Manikya Alister
- School of Psychological Sciences, University of Melbourne, Melbourne, Victoria, Australia
| | | | - Jessica Mead
- School of Psychology, University of Queensland, St Lucia, Queensland, Australia
| | - Tom G Bailey
- School of Human Movement and Nutrition Sciences, University of Queensland, St Lucia, Queensland, Australia
- School of Nursing, Midwifery and Social Work, University of Queensland, St Lucia, Queensland, Australia
| | - Jeff S Coombes
- School of Human Movement and Nutrition Sciences, University of Queensland, St Lucia, Queensland, Australia
| | - Natalie Vear
- School of Nursing, Midwifery and Social Work, University of Queensland, St Lucia, Queensland, Australia
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2
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Kern KL, McMains SA, Storer TW, Moffat SD, Schon K. Cardiorespiratory fitness is associated with fMRI signal in right cerebellum lobule VIIa Crus I and II during spatial navigation in older adult women. Front Aging Neurosci 2022; 14:979741. [PMID: 36506472 PMCID: PMC9727394 DOI: 10.3389/fnagi.2022.979741] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 11/04/2022] [Indexed: 11/25/2022] Open
Abstract
Spatial navigation is a cognitive skill critical for accomplishing daily goal-directed behavior in a complex environment; however, older adults exhibit marked decline in navigation performance with age. Neuroprotective interventions that enhance the functional integrity of navigation-linked brain regions, such as those in the medial temporal lobe memory system, may preserve spatial navigation performance in older adults. Importantly, a well-established body of literature suggests that cardiorespiratory fitness has measurable effects on neurobiological integrity in the medial temporal lobes, as well as in other brain areas implicated in spatial navigation, such as the precuneus and cerebellum. However, whether cardiorespiratory fitness modulates brain activity in these regions during navigation in older adults remains unknown. Thus, the primary objective of the current study was to examine cardiorespiratory fitness as a modulator of fMRI activity in navigation-linked brain regions in cognitively healthy older adults. To accomplish this objective, cognitively intact participants (N = 22, aged 60-80 years) underwent cardiorespiratory fitness testing to estimate maximal oxygen uptake ( V · O2max) and underwent whole-brain high-resolution fMRI while performing a virtual reality navigation task. Our older adult sample demonstrated significant fMRI signal in the right and left retrosplenial cortex, right precuneus, right and left inferior parietal cortex, right and left cerebellum lobule VIIa Crus I and II, right fusiform gyrus, right parahippocampal cortex, right lingual gyrus, and right hippocampus during encoding of a virtual environment. Most importantly, in women but not men (N = 16), cardiorespiratory fitness was positively associated with fMRI activity in the right cerebellum lobule VIIa Crus I and II, but not other navigation-linked brain areas. These findings suggest that the influence of cardiorespiratory fitness on brain function extends beyond the hippocampus, as observed in other work, to the cerebellum lobule VIIa Crus I and II, a component of the cerebellum that has recently been linked to cognition and more specifically, spatial processing.
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Affiliation(s)
- Kathryn L. Kern
- Department of Anatomy & Neurobiology, Boston University Aram V. Chobanian & Edward Avedisian School of Medicine, Boston, MA, United States,Center for Systems Neuroscience, Boston University, Boston, MA, United States,Center for Memory and Brain, Boston University, Boston, MA, United States,*Correspondence: Kathryn L. Kern,
| | | | - Thomas W. Storer
- Men’s Health, Aging, and Metabolism Unit, Brigham and Women’s Hospital, Boston, MA, United States
| | - Scott D. Moffat
- School of Psychology, Georgia Institute of Technology, Atlanta, GA, United States
| | - Karin Schon
- Department of Anatomy & Neurobiology, Boston University Aram V. Chobanian & Edward Avedisian School of Medicine, Boston, MA, United States,Center for Systems Neuroscience, Boston University, Boston, MA, United States,Center for Memory and Brain, Boston University, Boston, MA, United States,Cognitive Neuroimaging Center, Boston University, Boston, MA, United States,Department of Psychological and Brain Sciences, Boston University, Boston, MA, United States
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3
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Eisenstein T, Giladi N, Hendler T, Havakuk O, Lerner Y. Neural Synchrony During Naturalistic Information Processing Is Associated With Aerobically Active Lifestyle and Cardiorespiratory Fitness in Cognitively Intact Older Adults. Front Hum Neurosci 2022; 16:906099. [PMID: 35874153 PMCID: PMC9300901 DOI: 10.3389/fnhum.2022.906099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 06/06/2022] [Indexed: 12/03/2022] Open
Abstract
The functional neural mechanisms underlying the cognitive benefits of aerobic exercise have been a subject of ongoing research in recent years. However, while most neuroimaging studies to date which examined functional neural correlates of aerobic exercise have used simple stimuli in highly controlled and artificial experimental conditions, our everyday life experiences require a much more complex and dynamic neurocognitive processing. Therefore, we have used a naturalistic complex information processing fMRI paradigm of story comprehension to investigate the role of an aerobically active lifestyle in the processing of real-life cognitive-demanding situations. By employing the inter-subject correlation (inter-SC) approach, we have identified differences in reliable stimulus-induced neural responses between groups of aerobically active (n = 27) and non-active (n = 22) cognitively intact older adults (age 65–80). Since cardiorespiratory fitness has previously been suggested to play a key role in the neuroprotective potential of aerobic exercise, we have investigated its dose-response relationship with regional inter-subject neural responses. We found that aerobically active lifestyle and cardiorespiratory fitness were associated with more synchronized inter-subject neural responses during story comprehension in higher order cognitive and linguistic brain regions in the prefrontal and temporo-parietal cortices. In addition, while higher regional inter-SC values were associated with higher performance on a post-listening memory task, this was not translated to a significant between-group difference in task performance. We, therefore, suggest that the modulatory potential of aerobic exercise and cardiorespiratory fitness on cognitive processing may extend beyond simple and highly controlled stimuli to situations in which the brain faces continuous real-life complex information. Additional studies incorporating other aspects of real-life situations such as naturalistic visual stimuli, everyday life decision making, and motor responses in these situations are desired to further validate the observed relationship between aerobic exercise, cardiorespiratory fitness, and complex naturalistic information processing.
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Affiliation(s)
- Tamir Eisenstein
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
- Sagol Brain Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
- *Correspondence: Tamir Eisenstein Yulia Lerner
| | - Nir Giladi
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
- Department of Neurology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Talma Hendler
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
- Sagol Brain Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
- School of Psychological Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Ofer Havakuk
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
- Department of Cardiology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Yulia Lerner
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
- Sagol Brain Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
- *Correspondence: Tamir Eisenstein Yulia Lerner
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4
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Yogev-Seligmann G, Eisenstein T, Ash E, Giladi N, Sharon H, Nachman S, Bregman N, Kodesh E, Hendler T, Lerner Y. Neurocognitive Plasticity Is Associated with Cardiorespiratory Fitness Following Physical Exercise in Older Adults with Amnestic Mild Cognitive Impairment. J Alzheimers Dis 2021; 81:91-112. [PMID: 33720893 DOI: 10.3233/jad-201429] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Aerobic training has been shown to promote structural and functional neurocognitive plasticity in cognitively intact older adults. However, little is known about the neuroplastic potential of aerobic exercise in individuals at risk of Alzheimer's disease (AD) and dementia. OBJECTIVE We aimed to explore the effect of aerobic exercise intervention and cardiorespiratory fitness improvement on brain and cognitive functions in older adults with amnestic mild cognitive impairment (aMCI). METHODS 27 participants with aMCI were randomized to either aerobic training (n = 13) or balance and toning (BAT) control group (n = 14) for a 16-week intervention. Pre- and post-assessments included functional MRI experiments of brain activation during associative memory encoding and neural synchronization during complex information processing, cognitive evaluation using neuropsychological tests, and cardiorespiratory fitness assessment. RESULTS The aerobic group demonstrated increased frontal activity during memory encoding and increased neural synchronization in higher-order cognitive regions such as the frontal cortex and temporo-parietal junction (TPJ) following the intervention. In contrast, the BAT control group demonstrated decreased brain activity during memory encoding, primarily in occipital, temporal, and parietal areas. Increases in cardiorespiratory fitness were associated with increases in brain activationin both the left inferior frontal and precentral gyri. Furthermore, changes in cardiorespiratory fitness were also correlated with changes in performance on several neuropsychological tests. CONCLUSION Aerobic exercise training may result in functional plasticity of high-order cognitive areas, especially, frontal regions, among older adults at risk of AD and dementia. Furthermore, cardiorespiratory fitness may be an important mediating factor of the observed changes in neurocognitive functions.
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Affiliation(s)
- Galit Yogev-Seligmann
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Sagol Brain Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Tamir Eisenstein
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Sagol Brain Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Elissa Ash
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Department of Neurology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Nir Giladi
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Department of Neurology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel.,Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Haggai Sharon
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Sagol Brain Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel.,Pain Management & Neuromodulation Centre, Guy's & St Thomas' NHS Foundation Trust, London, UK.,Institute of Pain Medicine, Department of Anesthesiology and Critical Care Medicine, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Shikma Nachman
- Sagol Brain Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Noa Bregman
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Department of Neurology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Einat Kodesh
- Department of Physical Therapy Faculty of Social Welfare & Health Sciences, University of Haifa, Haifa, Israel
| | - Talma Hendler
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Sagol Brain Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel.,Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel.,School of Psychological Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Yulia Lerner
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Sagol Brain Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel.,Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
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5
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Lambertus M, Øverberg LT, Andersson KA, Hjelden MS, Hadzic A, Haugen ØP, Storm‐Mathisen J, Bergersen LH, Geiseler S, Morland C. L-lactate induces neurogenesis in the mouse ventricular-subventricular zone via the lactate receptor HCA 1. Acta Physiol (Oxf) 2021; 231:e13587. [PMID: 33244894 DOI: 10.1111/apha.13587] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 11/21/2020] [Accepted: 11/23/2020] [Indexed: 12/17/2022]
Abstract
AIM Adult neurogenesis occurs in two major niches in the brain: the subgranular zone of the hippocampal formation and the ventricular-subventricular zone. Neurogenesis in both niches is reduced in ageing and neurological disease involving dementia. Exercise can rescue memory by enhancing hippocampal neurogenesis, but whether exercise affects adult neurogenesis in the ventricular-subventricular zone remains unresolved. Previously, we reported that exercise induces angiogenesis through activation of the lactate receptor HCA1. The aim of the present study is to investigate HCA1 -dependent effects on neurogenesis in the two main neurogenic niches. METHODS Wild-type and HCA1 knock-out mice received high intensity interval exercise, subcutaneous injections of L-lactate, or saline injections, five days per week for seven weeks. Well-established markers for proliferating cells (Ki-67) and immature neurons (doublecortin), were used to investigate neurogenesis in the subgranular zone and the ventricular-subventricular zone. RESULTS We demonstrated that neurogenesis in the ventricular-subventricular zone is enhanced by HCA1 activation: Treatment with exercise or lactate resulted in increased neurogenesis in wild-type, but not in HCA1 knock-out mice. In the subgranular zone, neurogenesis was induced by exercise in both genotypes, but unaffected by lactate treatment. CONCLUSION Our study demonstrates that neurogenesis in the two main neurogenic niches in the brain is regulated differently: Neurogenesis in both niches was induced by exercise, but only in the ventricular-subventricular zone was neurogenesis induced by lactate through HCA1 activation. This opens for a role of HCA1 in the physiological control of neurogenesis, and potentially in counteracting age-related cognitive decline.
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Affiliation(s)
- Marvin Lambertus
- Section for Pharmacology and Pharmaceutical Biosciences Department of Pharmacy The Faculty of Mathematics and Natural Sciences University of Oslo Oslo Norway
| | - Linda Thøring Øverberg
- Section for Pharmacology and Pharmaceutical Biosciences Department of Pharmacy The Faculty of Mathematics and Natural Sciences University of Oslo Oslo Norway
- Institute for Behavioural Sciences Faculty of Health Sciences OsloMet—Oslo Metropolitan University Oslo Norway
| | - Krister A. Andersson
- The Brain and Muscle Energy Group, Electron Microscopy Laboratory Institute of Oral Biology Faculty of Dentistry University of Oslo Oslo Norway
- Division of Anatomy Department of Molecular Medicine Institute of Basic Medical Sciences University of Oslo Oslo Norway
| | - Malin S. Hjelden
- Section for Pharmacology and Pharmaceutical Biosciences Department of Pharmacy The Faculty of Mathematics and Natural Sciences University of Oslo Oslo Norway
| | - Alena Hadzic
- Section for Pharmacology and Pharmaceutical Biosciences Department of Pharmacy The Faculty of Mathematics and Natural Sciences University of Oslo Oslo Norway
| | - Øyvind P. Haugen
- The Brain and Muscle Energy Group, Electron Microscopy Laboratory Institute of Oral Biology Faculty of Dentistry University of Oslo Oslo Norway
| | - Jon Storm‐Mathisen
- Division of Anatomy Department of Molecular Medicine Institute of Basic Medical Sciences University of Oslo Oslo Norway
| | - Linda Hildegard Bergersen
- The Brain and Muscle Energy Group, Electron Microscopy Laboratory Institute of Oral Biology Faculty of Dentistry University of Oslo Oslo Norway
- Center for Healthy Aging Department of Neuroscience and Pharmacology Faculty of Health Sciences University of Copenhagen Copenhagen Denmark
| | - Samuel Geiseler
- Section for Pharmacology and Pharmaceutical Biosciences Department of Pharmacy The Faculty of Mathematics and Natural Sciences University of Oslo Oslo Norway
| | - Cecilie Morland
- Section for Pharmacology and Pharmaceutical Biosciences Department of Pharmacy The Faculty of Mathematics and Natural Sciences University of Oslo Oslo Norway
- Institute for Behavioural Sciences Faculty of Health Sciences OsloMet—Oslo Metropolitan University Oslo Norway
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6
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Eisenstein T, Yogev-Seligmann G, Ash E, Giladi N, Sharon H, Shapira-Lichter I, Nachman S, Hendler T, Lerner Y. Maximal aerobic capacity is associated with hippocampal cognitive reserve in older adults with amnestic mild cognitive impairment. Hippocampus 2020; 31:305-320. [PMID: 33314497 DOI: 10.1002/hipo.23290] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 09/03/2020] [Accepted: 11/28/2020] [Indexed: 01/03/2023]
Abstract
Maximal aerobic capacity (MAC) has been associated with preserved neural tissue or brain maintenance (BM) in healthy older adults, including the hippocampus. Amnestic mild cognitive impairment (aMCI) is considered a prodromal stage of Alzheimer's disease. While aMCI is characterized by hippocampal deterioration, the MAC-hippocampal relationship in these patients is not well understood. In contrast to healthy individuals, neurocognitive protective effects in neurodegenerative populations have been associated with mechanisms of cognitive reserve (CR) altering the neuropathology-cognition relationship. We investigated the MAC-hippocampal relationship in aMCI (n = 29) from the perspectives of BM and CR mechanistic models with structural MRI and a memory fMRI paradigm using both group-level (higher-fit patients vs. lower-fit patients) and individual level (continuous correlation) approaches. While MAC was associated with smaller hippocampal volume, contradicting the BM model, higher-fit patients demonstrated statistically significant lower correlation between hippocampal volume and memory performance compared with the lower-fit patients, supporting the model of CR. In addition, while there was no difference in brain activity between the groups during low cognitive demand (encoding of familiar stimuli), higher MAC level was associated with increased cortical and sub-cortical activation during increased cognitive demand (encoding of novel stimuli) and also with bilateral hippocampal activity even when controlling for hippocampal volume, suggesting for an independent effect of MAC. Our results suggest that MAC may be associated with hippocampal-related cognitive reserve in aMCI through altering the relationship between hippocampal-related structural deterioration and cognitive function. In addition, MAC was found to be associated with increased capacity to recruit neural resources during increased cognitive demands.
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Affiliation(s)
- Tamir Eisenstein
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Sagol Brain Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Galit Yogev-Seligmann
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Sagol Brain Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Elissa Ash
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Department of Neurology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Nir Giladi
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Department of Neurology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel.,Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Haggai Sharon
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Sagol Brain Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel.,Pain Management & Neuromodulation Centre, Guy's & St Thomas' NHS Foundation Trust, London, UK.,Institute of Pain Medicine, Department of Anesthesiology and Critical Care Medicine, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Irit Shapira-Lichter
- Functional MRI Center, Beilinson Hospital, Rabin Medical Center, Petah Tikva, Israel
| | - Shikma Nachman
- Sagol Brain Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Talma Hendler
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Sagol Brain Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel.,Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel.,School of Psychological Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Yulia Lerner
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Sagol Brain Institute, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel.,Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
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7
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Chandler MC, McGowan AL, Burles F, Mathewson KE, Scavuzzo CJ, Pontifex MB. Aerobic Fitness Unrelated to Acquisition of Spatial Relational Memory in College-Aged Adults. JOURNAL OF SPORT & EXERCISE PSYCHOLOGY 2020; 42:472-479. [PMID: 33176274 DOI: 10.1123/jsep.2020-0004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 06/17/2020] [Accepted: 06/22/2020] [Indexed: 06/11/2023]
Abstract
While compelling evidence indicates that poorer aerobic fitness relates to impairments in retrieving information from hippocampal-dependent memory, there is a paucity of research on how aerobic fitness relates to the acquisition of such relational information. Accordingly, the present investigation examined the association between aerobic fitness and the rate of encoding spatial relational memory-assessed using a maximal oxygen consumption test and a spatial configuration task-in a sample of 152 college-aged adults. The findings from this investigation revealed no association between aerobic fitness and the acquisition of spatial relational memory. These findings have implications for how aerobic fitness is characterized with regard to memory, such that aerobic fitness does not appear to relate to the rate of learning spatial-relational information; however, given previously reported evidence, aerobic fitness may be associated with a greater ability to recall relational information from memory.
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8
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McDonough IM, Festini SB, Wood MM. Risk for Alzheimer's disease: A review of long-term episodic memory encoding and retrieval fMRI studies. Ageing Res Rev 2020; 62:101133. [PMID: 32717407 DOI: 10.1016/j.arr.2020.101133] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 05/21/2020] [Accepted: 07/18/2020] [Indexed: 02/06/2023]
Abstract
Many risk factors have been identified that predict future progression to Alzheimer's disease (AD). However, clear links have yet to be made between these risk factors and how they affect brain functioning in early stages of AD. We conducted a narrative review and a quantitative analysis to better understand the relationship between nine categories of AD risk (i.e., brain pathology, genetics/family history, vascular health, head trauma, cognitive decline, engagement in daily life, late-life depression, sex/gender, and ethnoracial group) and task-evoked fMRI activity during episodic memory in cognitively-normal older adults. Our narrative review revealed widespread regional alterations of both greater and lower brain activity with AD risk. Nevertheless, our quantitative analysis revealed that a subset of studies converged on two patterns: AD risk was associated with (1) greater brain activity in frontal and parietal regions, but (2) reduced brain activity in hippocampal and occipital regions. The brain regions affected depended on the assessed memory stage (encoding or retrieval). Although the results clearly indicate that AD risks impact brain activity, we caution against using fMRI as a diagnostic tool for AD at the current time because the above consistencies were present among much variability, even among the same risk factor.
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Affiliation(s)
- Ian M McDonough
- Department of Psychology, The University of Alabama, BOX 870348, Tuscaloosa, AL 35487, USA.
| | - Sara B Festini
- Department of Psychology, University of Tampa, 401 W Kennedy Blvd. Tampa, FL 33606, USA
| | - Meagan M Wood
- Department of Psychology, Valdosta State University, 1500 N. Patterson Street, Valdosta, GA 31698, USA
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9
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Nauer RK, Dunne MF, Stern CE, Storer TW, Schon K. Improving fitness increases dentate gyrus/CA3 volume in the hippocampal head and enhances memory in young adults. Hippocampus 2019; 30:488-504. [PMID: 31588607 DOI: 10.1002/hipo.23166] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 08/30/2019] [Accepted: 09/06/2019] [Indexed: 12/25/2022]
Abstract
Converging evidence suggests a relationship between aerobic exercise and hippocampal neuroplasticity that interactively impacts hippocampally dependent memory. The majority of human studies have focused on the potential for exercise to reduce brain atrophy and attenuate cognitive decline in older adults, whereas animal studies often center on exercise-induced neurogenesis and hippocampal plasticity in the dentate gyrus (DG) of young adult animals. In the present study, initially sedentary young adults (18-35 years) participated in a moderate-intensity randomized controlled exercise intervention trial (ClinicalTrials.gov; NCT02057354) for a duration of 12 weeks. The aims of the study were to investigate the relationship between change in cardiorespiratory fitness (CRF) as determined by estimated V ˙ O 2 MAX , hippocampally dependent mnemonic discrimination, and change in hippocampal subfield volume. Results show that improving CRF after exercise training is associated with an increased volume in the left DG/CA3 subregion in young adults. Consistent with previous studies that found exercise-induced increases in anterior hippocampus in older adults, this result was specific to the hippocampal head, or most anterior portion, of the subregion. Our results also demonstrate a positive relationship between change in CRF and change in corrected accuracy for trials requiring the highest level of discrimination on a putative behavioral pattern separation task. This relationship was observed in individuals who were initially lower-fit, suggesting that individuals who show greater improvement in their CRF may receive greater cognitive benefit. This work extends animal models by providing evidence for exercise-induced neuroplasticity specific to the neurogenic zone of the human hippocampus.
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Affiliation(s)
- Rachel K Nauer
- Department of Psychological and Brain Sciences, Boston University, Boston, Massachusetts.,Center for Memory and Brain, Boston University, Boston, Massachusetts.,Center for Systems Neuroscience, Boston University, Boston, Massachusetts.,Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, Massachusetts
| | - Matthew F Dunne
- Center for Systems Neuroscience, Boston University, Boston, Massachusetts.,Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, Massachusetts
| | - Chantal E Stern
- Department of Psychological and Brain Sciences, Boston University, Boston, Massachusetts.,Center for Memory and Brain, Boston University, Boston, Massachusetts.,Center for Systems Neuroscience, Boston University, Boston, Massachusetts
| | - Thomas W Storer
- Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Karin Schon
- Department of Psychological and Brain Sciences, Boston University, Boston, Massachusetts.,Center for Memory and Brain, Boston University, Boston, Massachusetts.,Center for Systems Neuroscience, Boston University, Boston, Massachusetts.,Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, Massachusetts
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10
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Chen FT, Chen YP, Schneider S, Kao SC, Huang CM, Chang YK. Effects of Exercise Modes on Neural Processing of Working Memory in Late Middle-Aged Adults: An fMRI Study. Front Aging Neurosci 2019; 11:224. [PMID: 31551752 PMCID: PMC6737283 DOI: 10.3389/fnagi.2019.00224] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Accepted: 08/08/2019] [Indexed: 11/13/2022] Open
Abstract
Recent studies have highlighted the importance of regular exercise on cognitive function in aging populations, with aerobic exercise and cardiovascular fitness having received the largest amount of research attention. However, the relationship between exercise mode and cognitive function underlying behavioral modification and neural activation remains unknown. The present study, therefore, sought to examine the associations between different exercise modes and the working memory (WM) aspect of executive function as well as its task-evoked brain activation in the late middle-aged population. Seventy late middle-aged adults were classified into open-skill, closed-skill, or irregular exercise groups based on their participation in exercise activities prior to the study and then performed a spatial working memory (SWM) task while undergoing functional magnetic resonance imaging (fMRI) scanning. The results revealed that exercise groups, regardless of exercise modes, showed better SWM and physical fitness performance. Additionally, the open-skill group exhibited greater brain activation in the prefrontal lobe, anterior cingulate cortex/supplementary motor area (ACC/SMA), and hippocampus than those in the closed-skill group, suggesting a mode-sensitive compensatory mechanism in late middle-aged adults. These findings indicate that exercise promotes cognitive health, improves WM, and enhances neurocognitive scaffolding in late middle-aged adults and further suggest that various exercise modes can effectively modulate frontal and hippocampal function in the face of age-related neurocognitive declines, implications that may inform the development of exercise programs for the elderly.
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Affiliation(s)
- Feng-Tzu Chen
- Department of Physical Education, National Taiwan Normal University, Taipei, Taiwan
| | - Ya-Ping Chen
- Centre for Cognitive Neuroscience, University of Salzburg, Salzburg, Austria
| | - Stefan Schneider
- Institute of Movement and Neurosciences, German Sport University Cologne, Cologne, Germany
| | - Shih-Chun Kao
- Department of Health and Kinesiology, Purdue University, West Lafayette, IN, United States
| | - Chih-Mao Huang
- Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan.,Cognitive Neuroscience Laboratory, Institute of Linguistics, Academia Sinica, Taipei, Taiwan
| | - Yu-Kai Chang
- Department of Physical Education, National Taiwan Normal University, Taipei, Taiwan.,Institute for Research Excellence in Learning Science, National Taiwan Normal University, Taipei, Taiwan
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11
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Cole RC, Hazeltine E, Weng TB, Wharff C, DuBose LE, Schmid P, Sigurdsson G, Magnotta VA, Pierce GL, Voss MW. Cardiorespiratory fitness and hippocampal volume predict faster episodic associative learning in older adults. Hippocampus 2019; 30:143-155. [PMID: 31461198 DOI: 10.1002/hipo.23151] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 08/06/2019] [Accepted: 08/09/2019] [Indexed: 01/05/2023]
Abstract
Declining episodic memory is common among otherwise healthy older adults, in part due to negative effects of aging on hippocampal circuits. However, there is significant variability between individuals in severity of aging effects on the hippocampus and subsequent memory decline. Importantly, variability may be influenced by modifiable protective physiological factors such as cardiorespiratory fitness (CRF). More research is needed to better understand which aspects of cognition that decline with aging benefit most from CRF. The current study evaluated the relation of CRF with learning rate on the episodic associative learning (EAL) task, a task designed specifically to target hippocampal-dependent relational binding and to evaluate learning with repeated occurrences. Results show higher CRF was associated with faster learning rate. Larger hippocampal volume was also associated with faster learning rate, though hippocampal volume did not mediate the relationship between CRF and learning rate. Furthermore, to support the distinction between learning item relations and learning higher-order sequences, which declines with aging but is largely reliant on extra-hippocampal learning systems, we found learning rate on the EAL task was not related to motor sequence learning on the alternating serial reaction time task. Motor sequence learning was also not correlated with hippocampal volume. Thus, for the first time, we show that both higher CRF and larger hippocampal volume in healthy older adults are related to enhanced rate of relational memory acquisition.
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Affiliation(s)
- Rachel C Cole
- Department of Neurology, University of Iowa, Iowa City, Iowa
| | - Eliot Hazeltine
- Interdisciplinary Graduate Program in Neuroscience, University of Iowa, Iowa City, Iowa.,Department of Psychological and Brain Sciences, University of Iowa, Iowa City, Iowa
| | - Timothy B Weng
- Department of Psychological and Brain Sciences, University of Iowa, Iowa City, Iowa
| | - Conner Wharff
- Department of Psychological and Brain Sciences, University of Iowa, Iowa City, Iowa
| | - Lyndsey E DuBose
- Department of Health and Human Physiology, University of Iowa, Iowa City, Iowa
| | - Phillip Schmid
- Department of Internal Medicine, University of Iowa Hospitals and Clinics, Iowa City, Iowa
| | - Gardar Sigurdsson
- Department of Internal Medicine, University of Iowa Hospitals and Clinics, Iowa City, Iowa
| | - Vincent A Magnotta
- Interdisciplinary Graduate Program in Neuroscience, University of Iowa, Iowa City, Iowa.,Department of Radiology, University of Iowa Carver College of Medicine, Iowa City, Iowa
| | - Gary L Pierce
- Department of Health and Human Physiology, University of Iowa, Iowa City, Iowa
| | - Michelle W Voss
- Interdisciplinary Graduate Program in Neuroscience, University of Iowa, Iowa City, Iowa.,Department of Psychological and Brain Sciences, University of Iowa, Iowa City, Iowa
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12
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The Association of Cardiorespiratory Fitness on Memory Function: Systematic Review. ACTA ACUST UNITED AC 2019; 55:medicina55050127. [PMID: 31075908 PMCID: PMC6572478 DOI: 10.3390/medicina55050127] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 04/27/2019] [Accepted: 05/07/2019] [Indexed: 01/02/2023]
Abstract
Background and Objectives: Cardiorespiratory fitness is an important predictor of cardiovascular and cardiometabolic health. To extend our knowledge on the health effects associated with cardiorespiratory fitness, the objective of this study was to evaluate the association of cardiorespiratory fitness on memory function. Materials and Methods: Embase/PubMed, Web of Science, Google Scholar, Sports Discus, and PsychInfo databases were searched. Inclusionary criteria included: (1) were conducted among adult humans (18+ years), (2) evaluated cardiorespiratory fitness as the independent variable, (3) measured cardiorespiratory fitness with an objective device (e.g., indirect calorimetry), (4) evaluated memory function (any type) as the outcome measure, and (5) included either a cross-sectional, prospective, or experimental-study design. Information on the participant’s characteristics, study design, cardiorespiratory fitness assessment, memory type, whether the study statistically controlled for exercise behavior, and study results were extracted. The relationship between cardiorespiratory fitness and memory was synthesized while considering the data extraction parameters. Results: In total, 17 articles met the inclusionary criteria, including two prospective cohort studies and 15 cross-sectional studies. The main findings of this review are twofold: (1) across the 17 evaluated studies, 15 (88.2%) studies demonstrated some evidence of a positive association between cardiorespiratory fitness (CRF) and memory function, and (2) none of these 17 studies statistically controlled for physical activity behavior. Conclusion: CRF appears to be positively associated with memory function, however, it is uncertain as to whether this association occurs independently of physical activity or is mediated via physical activity behavior.
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13
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Voss MW, Soto C, Yoo S, Sodoma M, Vivar C, van Praag H. Exercise and Hippocampal Memory Systems. Trends Cogn Sci 2019; 23:318-333. [PMID: 30777641 PMCID: PMC6422697 DOI: 10.1016/j.tics.2019.01.006] [Citation(s) in RCA: 122] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 01/11/2019] [Accepted: 01/16/2019] [Indexed: 01/17/2023]
Abstract
No medications prevent or reverse age-related cognitive decline. Physical activity (PA) enhances memory in rodents, but findings are mixed in human studies. As a result, exercise guidelines specific for brain health are absent. Here, we re-examine results from human studies, and suggest the use of more sensitive tasks to evaluate PA effects on age-related changes in the hippocampus, such as relational memory and mnemonic discrimination. We discuss recent advances from rodent and human studies into the underlying mechanisms at both the central and peripheral levels, including neurotrophins and myokines that could contribute to improved memory. Finally, we suggest guidelines for future research to help expedite well-founded PA recommendations for the public.
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Affiliation(s)
- Michelle W Voss
- Department of Psychological and Brain Sciences, University of Iowa, Iowa City, IA, USA.
| | - Carmen Soto
- Laboratory of Neurogenesis and Neuroplasticity, Department of Physiology, Biophysics and Neuroscience, Center for Research and Advanced Studies of the National Polytechnic Institute, Mexico City, Mexico
| | - Seungwoo Yoo
- Department of Biomedical Science, Charles E. Schmidt College of Medicine, and Brain Institute, Florida Atlantic University, Jupiter, FL 33458, USA
| | - Matthew Sodoma
- Department of Psychological and Brain Sciences, University of Iowa, Iowa City, IA, USA
| | - Carmen Vivar
- Laboratory of Neurogenesis and Neuroplasticity, Department of Physiology, Biophysics and Neuroscience, Center for Research and Advanced Studies of the National Polytechnic Institute, Mexico City, Mexico
| | - Henriette van Praag
- Department of Biomedical Science, Charles E. Schmidt College of Medicine, and Brain Institute, Florida Atlantic University, Jupiter, FL 33458, USA
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14
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Hegberg NJ, Hayes JP, Hayes SM. Exercise Intervention in PTSD: A Narrative Review and Rationale for Implementation. Front Psychiatry 2019; 10:133. [PMID: 30949075 PMCID: PMC6437073 DOI: 10.3389/fpsyt.2019.00133] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 02/25/2019] [Indexed: 12/11/2022] Open
Abstract
Posttraumatic stress disorder (PTSD) is a prominent mental health problem in veteran and community populations. There is accumulating evidence to suggest that aerobic exercise may serve as an effective treatment option for individuals with PTSD. The purpose of this review is to summarize the existing literature exploring aerobic exercise and PTSD and briefly discuss potential mechanisms of PTSD symptom reduction. A search of electronic databases and reference sections of relevant articles published through October 1, 2018 revealed 19 relevant studies that examined aerobic exercise and PTSD symptomatology. A narrative review of extant studies provides encouraging evidence that aerobic exercise interventions alone or as an adjunct to standard treatment may positively impact PTSD symptoms. Potential mechanisms by which aerobic exercise could exert a positive impact in PTSD include exposure and desensitization to internal arousal cues, enhanced cognitive function, exercise-induced neuroplasticity, normalization of hypothalamic pituitary axis (HPA) function, and reductions in inflammatory markers. Randomized clinical trials and translational neuroscience approaches are required to clarify the efficacy of exercise intervention for PTSD and elucidate potential mechanisms of exercise-induced PTSD symptom reduction.
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Affiliation(s)
- Nicole J. Hegberg
- VA Boston Healthcare System, Memory Disorders Research Center, Boston University School of Medicine, Boston, MA, United States
| | - Jasmeet P. Hayes
- Department of Psychology, The Ohio State University, Columbus, OH, United States
- Chronic Brain Injury Initiative, The Ohio State University, Columbus, OH, United States
| | - Scott M. Hayes
- VA Boston Healthcare System, Memory Disorders Research Center, Boston University School of Medicine, Boston, MA, United States
- Department of Psychology, The Ohio State University, Columbus, OH, United States
- Chronic Brain Injury Initiative, The Ohio State University, Columbus, OH, United States
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15
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Dougherty RJ, Lindheimer JB, Stegner AJ, Van Riper S, Okonkwo OC, Cook DB. An Objective Method to Accurately Measure Cardiorespiratory Fitness in Older Adults Who Cannot Satisfy Widely Used Oxygen Consumption Criteria. J Alzheimers Dis 2019; 61:601-611. [PMID: 29226867 DOI: 10.3233/jad-170576] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Cardiorespiratory fitness (CRF) is routinely investigated in older adults; however, the most appropriate CRF measure to use for this population has received inadequate attention. This study aimed to 1) evaluate the reliability and validity of the oxygen uptake efficiency slope (OUES) as a sub-maximal measurement of CRF; 2) examine demographic, risk-factor, and exercise testing differences in older adults who satisfied standardized criteria for a peak oxygen consumption (V̇O2peak) test compared to those who did not; and 3) determine the difference between directly measured V̇O2peak values and OUES-predicted V̇O2peak values. One hundred ten enrollees from the Wisconsin Registry for Alzheimer's Prevention participated in this study. Participants performed a graded maximal exercise test and wore an accelerometer for 7 days. For each participant, the OUES was calculated at 75%, 90%, and 100% of exercise duration. V̇O2peak was recorded at peak effort, and one week of physical activity behavior was measured. OUES values calculated at separate relative exercise durations displayed excellent reliability (ICC = 0.995; p < 0.001), and were strongly correlated with V̇O2peak (rrange = 0.801-0.909; p < 0.001). As hypothesized, participants who did not satisfy V̇O2peak criteria were significantly older than those who satisfied criteria (p = 0.049) and attained a directly measured V̇O2peak that was 2.31 mL·kg·min-1 less than the value that was predicted by OUES V̇O2peak (p = 0.003). Older adults are less likely to satisfy V̇O2peak criteria, which results in an underestimation of their CRF. Without adhering to standardized criteria, V̇O2peak measurement error may lead to misinterpretation of CRF and age-related associations. Here, we conclude that OUES is a reliable, valid measurement of CRF which does not require achievement of standardized criteria.
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Affiliation(s)
- Ryan J Dougherty
- William S. Middleton Memorial Veterans Hospital, Madison, WI, USA.,Department of Kinesiology, University of Wisconsin School of Education, Madison, WI, USA.,Wisconsin Alzheimer's Disease Research Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Jacob B Lindheimer
- William S. Middleton Memorial Veterans Hospital, Madison, WI, USA.,Department of Kinesiology, University of Wisconsin School of Education, Madison, WI, USA.,Department of Veterans Affairs, New Jersey Healthcare System, War Related Illness and Injury Study Center, East Orange, NJ, USA
| | - Aaron J Stegner
- William S. Middleton Memorial Veterans Hospital, Madison, WI, USA.,Department of Kinesiology, University of Wisconsin School of Education, Madison, WI, USA
| | - Stephanie Van Riper
- William S. Middleton Memorial Veterans Hospital, Madison, WI, USA.,Department of Kinesiology, University of Wisconsin School of Education, Madison, WI, USA
| | - Ozioma C Okonkwo
- Wisconsin Alzheimer's Disease Research Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA.,Geriatric Research Education and Clinical Center, William S. Middleton Memorial Veterans Hospital, Madison, WI, USA.,Wisconsin Alzheimer's Institute, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Dane B Cook
- William S. Middleton Memorial Veterans Hospital, Madison, WI, USA.,Department of Kinesiology, University of Wisconsin School of Education, Madison, WI, USA
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16
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Ahlskog JE. Aerobic Exercise: Evidence for a Direct Brain Effect to Slow Parkinson Disease Progression. Mayo Clin Proc 2018; 93:360-372. [PMID: 29502566 DOI: 10.1016/j.mayocp.2017.12.015] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 11/01/2017] [Accepted: 12/18/2017] [Indexed: 12/21/2022]
Abstract
No medications are proven to slow the progression of Parkinson disease (PD). Of special concern with longer-standing PD is cognitive decline, as well as motor symptoms unresponsive to dopamine replacement therapy. Not fully recognized is the substantial accumulating evidence that long-term aerobic exercise may attenuate PD progression. Randomized controlled trial proof will not be forthcoming due to many complicating methodological factors. However, extensive and diverse avenues of scientific investigation converge to argue that aerobic exercise and cardiovascular fitness directly influence cerebral mechanisms mediating PD progression. To objectively assess the evidence for a PD exercise benefit, a comprehensive PubMed literature search was conducted, with an unbiased focus on exercise influences on parkinsonism, cognition, brain structure, and brain function. This aggregate literature provides a compelling argument for regular aerobic-type exercise and cardiovascular fitness attenuating PD progression.
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17
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Mitchell KJ, MacPherson SE. The cognitive neuroscience of source memory: Moving the ball forward. Cortex 2017; 91:1-8. [PMID: 28495025 DOI: 10.1016/j.cortex.2017.04.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 04/12/2017] [Indexed: 02/02/2023]
Affiliation(s)
- Karen J Mitchell
- Department of Psychology, West Chester University of Pennsylvania, USA.
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18
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Memel M, Ryan L. Visual integration enhances associative memory equally for young and older adults without reducing hippocampal encoding activation. Neuropsychologia 2017; 100:195-206. [PMID: 28456521 DOI: 10.1016/j.neuropsychologia.2017.04.031] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 04/16/2017] [Accepted: 04/26/2017] [Indexed: 01/10/2023]
Abstract
The ability to remember associations between previously unrelated pieces of information is often impaired in older adults (Naveh-Benjamin, 2000). Unitization, the process of creating a perceptually or semantically integrated representation that includes both items in an associative pair, attenuates age-related associative deficits (Bastin et al., 2013; Ahmad et al., 2015; Zheng et al., 2015). Compared to non-unitized pairs, unitized pairs may rely less on hippocampally-mediated binding associated with recollection, and more on familiarity-based processes mediated by perirhinal cortex (PRC) and parahippocampal cortex (PHC). While unitization of verbal materials improves associative memory in older adults, less is known about the impact of visual integration. The present study determined whether visual integration improves associative memory in older adults by minimizing the need for hippocampal (HC) recruitment and shifting encoding to non-hippocampal medial temporal structures, such as the PRC and PHC. Young and older adults were presented with a series of objects paired with naturalistic scenes while undergoing fMRI scanning, and were later given an associative memory test. Visual integration was varied by presenting the object either next to the scene (Separated condition) or visually integrated within the scene (Combined condition). Visual integration improved associative memory among young and older adults to a similar degree by increasing the hit rate for intact pairs, but without increasing false alarms for recombined pairs, suggesting enhanced recollection rather than increased reliance on familiarity. Also contrary to expectations, visual integration resulted in increased hippocampal activation in both age groups, along with increases in PRC and PHC activation. Activation in all three MTL regions predicted discrimination performance during the Separated condition in young adults, while only a marginal relationship between PRC activation and performance was observed during the Combined condition. Older adults showed less overall activation in MTL regions compared to young adults, and associative memory performance was most strongly predicted by prefrontal, rather than MTL, activation. We suggest that visual integration benefits both young and older adults similarly, and provides a special case of unitization that may be mediated by recollective, rather than familiarity-based encoding processes.
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Affiliation(s)
- Molly Memel
- Department of Psychology, University of Arizona, 1503 E. University Blvd, Bldg #68, Rm 312, Tucson, AZ 85721, USA.
| | - Lee Ryan
- Department of Psychology, University of Arizona, 1503 E. University Blvd, Bldg #68, Rm 312, Tucson, AZ 85721, USA.
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