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Russell MT, Hajdúk M, Springfield CR, Klein HS, Bass EL, Mittal VA, Williams TF, O’Toole AJ, Pinkham AE. Identity recognition from faces and bodies in schizophrenia spectrum disorders. Schizophr Res Cogn 2024; 36:100307. [PMID: 38486791 PMCID: PMC10937230 DOI: 10.1016/j.scog.2024.100307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 03/04/2024] [Accepted: 03/04/2024] [Indexed: 03/17/2024]
Abstract
Deficits in facial identity recognition and its association with poor social functioning are well documented in schizophrenia, but none of these studies have assessed the role of the body in these processes. Recent research in healthy populations shows that the body is also an important source of information in identity recognition, and the current study aimed to thoroughly examine identity recognition from both faces and bodies in schizophrenia. Sixty-five individuals with schizophrenia and forty-nine healthy controls completed three conditions of an identity matching task in which they attempted to match unidentified persons in unedited photos of faces and bodies, edited photos showing faces only, or edited photos showing bodies only. Results revealed global deficits in identity recognition in individuals with schizophrenia (ηp2 = 0.068), but both groups showed better recognition from bodies alone as compared to faces alone (ηp2 = 0.573), suggesting that the ability to extract useful information from bodies when identifying persons may remain partially preserved in schizophrenia. Further research is necessary to understand the relationship between face/body processing, identity recognition, and functional outcomes in individuals with schizophrenia-spectrum disorders.
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Affiliation(s)
- Madisen T. Russell
- Department of Psychology, University of Texas at Dallas, 800 W. Campbell Rd., Richardson, TX 75080, USA
- Department of Psychology, Indiana University-Purdue University Indianapolis, 402 N. Blackford St., LD 124, Indianapolis, IN 46202, USA
| | - Michal Hajdúk
- Department of Psychology, Comenius University in Bratislava, Gondova 2, 811 02 Bratislava 1, Slovak Republic
- Department of Psychiatry, Comenius University in Bratislava, Mickiewiczova 13, 813 69 Bratislava, Slovak Republic
- The Center for Psychiatric Disorders Research, Science Park, Comenius University in Bratislava, Ilkovicova 8, 841 04 Bratislava 4, Slovak Republic
| | - Cassi R. Springfield
- Department of Psychology, University of Texas at Dallas, 800 W. Campbell Rd., Richardson, TX 75080, USA
| | - Hans S. Klein
- Department of Psychology, University of Texas at Dallas, 800 W. Campbell Rd., Richardson, TX 75080, USA
| | - Emily L. Bass
- Department of Psychology, University of Texas at Dallas, 800 W. Campbell Rd., Richardson, TX 75080, USA
| | - Vijay A. Mittal
- Department of Psychology, Northwestern University, 2029 Sheridan Rd., 102 Swift Hall, Evanston, IL 60208, USA
- Department of Psychiatry, Northwestern University, 676 N. St. Clair St., Chicago, IL 60611, USA
| | - Trevor F. Williams
- Department of Psychology, Northwestern University, 2029 Sheridan Rd., 102 Swift Hall, Evanston, IL 60208, USA
| | - Alice J. O’Toole
- Department of Psychology, University of Texas at Dallas, 800 W. Campbell Rd., Richardson, TX 75080, USA
| | - Amy E. Pinkham
- Department of Psychology, University of Texas at Dallas, 800 W. Campbell Rd., Richardson, TX 75080, USA
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Klein HS, Vanneste S, Pinkham AE. The limited effect of neural stimulation on visual attention and social cognition in individuals with schizophrenia. Neuropsychologia 2021; 157:107880. [PMID: 33961863 DOI: 10.1016/j.neuropsychologia.2021.107880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 04/15/2021] [Accepted: 04/29/2021] [Indexed: 12/24/2022]
Abstract
BACKGROUND Research demonstrates a relationship between faulty visual attention and poorer social cognition in schizophrenia. One potential explanatory model suggests abnormal neuromodulation in specific neural networks may result in reduced attention to socially important cues, leading to poorer understanding of another's emotional state or intentions. OBJECTIVE The current study experimentally manipulated neural networks using tDCS to examine this potential causal mechanism. The primary aim was to determine whether stimulation to the right temporoparietal junction (rTPJ) improves visual attention, and secondary aims were to determine whether 1) stimulation improves social cognitive performance and 2) visual attention moderates this improved performance. METHOD Using a double-blind crossover design, 69 individuals with schizophrenia underwent both active and sham stimulation to either the rTPJ of the ventral attention network (n = 36) or the dorsomedial prefrontal cortex of the social brain network (dmPFC; n = 33). Following stimulation, participants completed tasks assessing emotion recognition and mentalizing. Concurrent eye tracking assessed visual attention, measuring proportion of time spent attending to areas of interest. RESULTS For emotion recognition, stimulation failed to impact either visual attention or social cognitive task accuracy. Similarly, neurostimulation failed to affect visual attention on the mentalizing task. However, exploratory analyses demonstrated that mentalizing accuracy significantly improved after stimulation to the active comparator, dmPFC, with no improvement after stimulation to rTPJ. CONCLUSION Results demonstrate limited effect of a single stimulation session on visual attention and emotion recognition accuracy but provide initial support for an alternate neural mechanism for mentalizing, highlighting the importance of executive functions over visual attention.
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Affiliation(s)
- Hans S Klein
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA.
| | - Sven Vanneste
- Trinity College Institute for Neuroscience, Trinity College Dublin, Ireland
| | - Amy E Pinkham
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA; Department of Psychiatry, University of Texas Southwestern Medical School, Dallas, TX,, USA
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Klein HS, Springfield CR, Bass E, Ludwig K, Penn DL, Harvey PD, Pinkham AE. Measuring mentalizing: A comparison of scoring methods for the hinting task. Int J Methods Psychiatr Res 2020; 29:e1827. [PMID: 32385868 PMCID: PMC7301277 DOI: 10.1002/mpr.1827] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Revised: 02/19/2020] [Accepted: 04/12/2020] [Indexed: 11/29/2022] Open
Abstract
OBJECTIVE The Social Cognition Psychometric Evaluation (SCOPE) study supported the utility and practicality of the Hinting task as a measure of social cognition/mentalizing in clinical trials, specifically with the SCOPE authors' stringent scoring system. However, it remains unclear whether the SCOPE scoring system is necessary for the task to be judged as psychometrically sound. METHOD Independent raters rescored data from the three phases of SCOPE using the Hinting task's original scoring criteria. Psychometric properties of the task when scored with the original criteria versus more stringent SCOPE criteria were compared in a large sample of individuals with chronic schizophrenia (n = 397) and matched controls (n = 300) as well as a smaller sample of individuals with early psychosis (n = 38) and controls (n = 39). RESULTS In both samples, SCOPE criteria resulted in lowered average scores and reduced ceiling effects. Further, revised scoring resulted in strengthened relationships between the hinting task and outcome measures in the chronic sample, and better differentiated early psychosis patients from controls. Conversely, test-retest reliability and internal consistency estimates were not improved using revised scoring and remained suboptimal, particularly for healthy controls. CONCLUSION Overall, SCOPE scoring criteria improved some psychometric properties and clinical utility, suggesting that these criteria should be considered for implementation.
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Affiliation(s)
- Hans S Klein
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, Texas, USA
| | - Cassi R Springfield
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, Texas, USA
| | - Emily Bass
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, Texas, USA.,Department of Psychology, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana, USA
| | - Kelsey Ludwig
- Department of Psychology and Neuroscience, University of North Carolina-Chapel Hill, Chapel Hill, North Carolina, USA
| | - David L Penn
- Department of Psychology and Neuroscience, University of North Carolina-Chapel Hill, Chapel Hill, North Carolina, USA.,School of Behavioural and Health Sciences, Australian Catholic University, Melbourne, Victoria, Australia
| | - Philip D Harvey
- Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, Florida, USA.,Research Service, Miami VA Healthcare System, Miami, Florida, USA
| | - Amy E Pinkham
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, Texas, USA.,Department of Psychiatry, University of Texas Southwestern Medical School, Dallas, Texas, USA
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Abstract
INTRODUCTION Disturbed emotion processing is well documented in schizophrenia, but the majority of studies evaluate processing of emotion only from facial expressions. Social cues are also communicated via body posture, and they are similarly relevant for successful social interactions. The aim of the current study was to thoroughly examine body perception abilities in individuals with schizophrenia. METHODS Fifty-nine patients with schizophrenia and 37 healthy controls completed two tasks of body processing. The first, which was based on the Affect Misattribution Procedure, evaluated implicit processing of bodily emotions, and the second utilised a traditional emotion identification paradigm to assess explicit emotion recognition. RESULTS Results revealed aberrant implicit processing, but more normative explicit processing, in individuals with schizophrenia. Moderate associations were found between processing of bodies and symptoms of paranoia. Performance on the tasks was not related to cognitive functioning but was associated with clinician-rated social functioning. CONCLUSIONS Collectively, these results provide information about disturbed processing of bodily emotions in schizophrenia and suggest that these disturbances are associated with the severity of positive symptoms and predict difficulties in everyday social activities and interpersonal relationships.
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Affiliation(s)
- Michal Hajdúk
- Department of Psychology, Faculty of Arts, Comenius University Bratislava, Slovak Republic.,Clinic of Psychiatry, Faculty of Medicine, Comenius University, Bratislava, Slovak Republic.,Center for Psychiatric Disorders Research - UK, Science Park, Comenius University in Bratislava, Slovak Republic
| | - Hans S Klein
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA
| | - Emily L Bass
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA
| | - Cassi R Springfield
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA
| | - Amy E Pinkham
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA.,Department of Psychiatry, University of Texas Southwestern Medical School, Dallas, TX, USA
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Pinkham AE, Klein HS, Hardaway GB, Kemp KC, Harvey PD. Neural correlates of social cognitive introspective accuracy in schizophrenia. Schizophr Res 2018; 202:166-172. [PMID: 30077432 DOI: 10.1016/j.schres.2018.07.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Revised: 06/24/2018] [Accepted: 07/01/2018] [Indexed: 10/28/2022]
Abstract
Introspective accuracy (IA) refers to the ability to accurately assess one's own skills and capabilities. Recent work provides evidence of IA deficits in schizophrenia that are predictive of everyday functioning. Thus, IA deficits are an important target to understand mechanistically. The current study used fMRI to assess neural activation in 32 healthy controls and 31 individuals with schizophrenia as they completed IA and control versions of a social cognitive task (i.e., emotion recognition). Analyses revealed different areas of IA-specific neural activity between groups including activations of rostrolateral prefrontal cortex (rlPFC) and dorsal anterior cingulate cortex in healthy individuals that were absent in patients. Direct group comparisons revealed greater IA-specific activation for healthy individuals in right rlPFC, a region thought to be critical for successful IA. For healthy individuals only, activation in rlPFC was positively correlated with IA ability, but no association was observed for patients. Further, among individuals with schizophrenia, increased activation of rlPFC during judgments of IA was positively correlated with better informant-reported interpersonal functioning. These results suggest that reduced specialization of IA-related neural activation may contribute to impaired IA in schizophrenia and also highlight IA as a potential target for remediation programs aimed at improving real-world functioning.
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Affiliation(s)
- Amy E Pinkham
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA; Department of Psychiatry, University of Texas Southwestern Medical School, Dallas, TX, USA.
| | - Hans S Klein
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA
| | - Grant B Hardaway
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA
| | - Kathryn C Kemp
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA
| | - Philip D Harvey
- Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, FL, USA; Research Service, Miami VA Healthcare System, USA
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Klein HS, Pinkham AE. Examining reasoning biases in schizophrenia using a modified "Jumping to Conclusions" probabilistic reasoning task. Psychiatry Res 2018; 270:180-186. [PMID: 30261407 DOI: 10.1016/j.psychres.2018.09.020] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 06/15/2018] [Accepted: 09/12/2018] [Indexed: 01/05/2023]
Abstract
Although the Jumping To Conclusion (JTC) bias has been extensively studied in relation to schizophrenia and persecutory delusions, the relationship between JTC and other reasoning biases implicated in delusional ideation is not fully understood. We modified the traditional JTC task to assess co-occurrence of reasoning biases in decision making. Forty-six patients with schizophrenia and 46 healthy controls completed two versions [neutral colored beads and salient comments] of the modified task. We replicated previous findings indicating that patients showed a greater JTC bias, and in both groups, the JTC bias was more pronounced for the salient task. However, we observed a significant effect for non-Bayesian judgments, indicating that patients showed greater difficulty in probabilistic reasoning. When controlling for probabilistic reasoning ability, the observed JTC bias effects were diminished. Our findings that faulty probability assessment accounts for the JTC bias indicates that the traditional JTC bias task may not represent an inherent hasty decision-making bias, but rather an inability to fully understand and execute the stated goals of the task. These results call into question the current understanding of the JTC bias and the independence of this bias apart from the cognitive demands of the task.
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Affiliation(s)
- Hans S Klein
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA.
| | - Amy E Pinkham
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA; Department of Psychiatry, University of Texas Southwestern Medical School, Dallas, TX, USA
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Hajdúk M, Klein HS, Harvey PD, Penn DL, Pinkham AE. Paranoia and interpersonal functioning across the continuum from healthy to pathological - Network analysis. Br J Clin Psychol 2018; 58:19-34. [PMID: 30028025 DOI: 10.1111/bjc.12199] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Indexed: 02/06/2023]
Abstract
OBJECTIVE Previous research has suggested that paranoia is associated with impaired social functioning in patients with schizophrenia and healthy individuals with high levels of paranoid ideation. This study analysed the relationship between paranoia and interpersonal functioning across the paranoia continuum using network analysis. METHOD Levels of paranoid ideation and interpersonal functioning were measured in a non-clinical sample (N = 853) and in patients with schizophrenia spectrum disorders (N = 226). Network analyses were used to examine the nature of paranoia's relation to interpersonal functioning in both populations. RESULTS Although the most central characteristic of paranoia in both samples was the feeling of being talked about behind one's back, across samples, individual characteristics were differentially related to various aspects of interpersonal functioning. Among clinical individuals, difficulties in interpersonal functioning were related to perceived previous experiences of being treated poorly by others, whereas among the non-clinical sample, interpersonal functioning was related to negative beliefs about others. CONCLUSIONS The current results support previous findings linking paranoid ideation to interpersonal functioning in both clinical and non-clinical samples. Patterns of these relationships differed slightly across groups. Results in general support a continuum model of paranoia. PRACTITIONER POINTS Network analyses were used to identify central aspects of persecutory ideation in both clinical and non-clinical samples. Qualitative assessment of clinical and non-clinical networks revealed similar central symptoms and supported a continuum model of paranoia. Central aspects of paranoia, that is, feeling that others have talked about oneself behind one's back, being disappointed by others, and having distressing feelings of being watched by others, were associated with deficits in interpersonal functioning in both samples. Central aspects of paranoia may be beneficial targets for psychosocial interventions aimed at reducing paranoid ideation and improving interpersonal functioning. Demographic characteristics for this study differed between samples which may limit generalization of findings. Future research is needed to explore temporal associations and moment-to-moment dynamics between paranoid ideation and problems in interpersonal functioning.
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Affiliation(s)
- Michal Hajdúk
- Department of Psychology, Faculty of Arts, Comenius University, Bratislava, Slovakia.,Department of Psychiatry, Faculty of Medicine, Comenius University, Bratislava, Slovakia
| | - Hans S Klein
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, Texas, USA
| | - Philip D Harvey
- Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Florida, USA.,Research Service, Miami VA Healthcare System, Florida, USA
| | - David L Penn
- Department of Psychology, University of North Carolina, Chapel Hill, North Carolina, USA.,School of Psychology, Australian Catholic University, Melbourne, Victoria, Australia
| | - Amy E Pinkham
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, Texas, USA.,Department of Psychiatry, University of Texas Southwestern Medical School, Dallas, Texas, USA
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Klein HS, Kelsven S, Pinkham AE. Increased social cognitive bias in subclinical paranoia. Schizophr Res Cogn 2018; 12:74-76. [PMID: 29928600 PMCID: PMC6007081 DOI: 10.1016/j.scog.2018.05.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Revised: 05/23/2018] [Accepted: 05/24/2018] [Indexed: 11/29/2022]
Affiliation(s)
- Hans S Klein
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA
| | - Skylar Kelsven
- Department of Psychology, University of California, San Diego
- UCSD - Department of Psychiatry, USA
| | - Amy E Pinkham
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, USA.,Department of Psychiatry, University of Texas Southwestern Medical School, Dallas, TX, USA
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Werk CM, Klein HS, Nesbitt CE, Chapman CA. Long-term depression in the sensorimotor cortex induced by repeated delivery of 10 Hz trains in vivo. Neuroscience 2006; 140:13-20. [PMID: 16530972 DOI: 10.1016/j.neuroscience.2006.02.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2005] [Revised: 01/03/2006] [Accepted: 02/02/2006] [Indexed: 10/24/2022]
Abstract
Memory consolidation in the neocortex is thought to be mediated in part by bi-directional modifications of synaptic strength. The sensorimotor cortex shows marked spontaneous activity near 10 Hz during both waking and sleep in the form of electroencephalographic spindle waves, and is also sensitive to electrical activation of inputs at 10 Hz. Induction of long-term synaptic depression in corpus callosum inputs to layer V of the sensorimotor cortex of the awake, adult rat requires repeated low-frequency stimulation over many days. To determine if 10 Hz stimulation may facilitate the induction of long-term depression, we compared the amounts of long-term depression induced by conventional 1 Hz trains, repeated delivery of 450 pairs of stimulation pulses using a 100 ms interpulse interval, and 45 short, 2 s, 10 Hz trains. Each pattern was delivered daily for 10 days and was matched for total duration and number of pulses. Changes in synaptic responses were assessed by monitoring field potentials evoked by stimulation of the corpus callosum. A facilitation of synaptic responses in layer V was observed during delivery of both paired-pulse trains and 10 Hz trains. There was no significant difference in long-term depression induced by 1 Hz stimulation and repeated paired-pulse stimulation, but 10 Hz trains induced significantly greater long-term depression than 1 Hz trains in both the early monosynaptic and late polysynaptic field potential components. The effectiveness of short 10 Hz trains for the induction of long-term depression suggests that synchronous population activity at frequencies near 10 Hz such as spindle waves may contribute to endogenous synaptic depression in sensorimotor cortex.
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Affiliation(s)
- C M Werk
- Centre for Studies in Behavioral Neurobiology, Department of Psychology, Concordia University, 7141 Sherbrooke Street West, Room SP-244, Montréal, Québec, Canada H4B 1R6
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Klein HS, Engerman SL. [Not Available]. Ann Econ Soc Civilis 2001; 31:1213-24. [PMID: 11631470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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Klein HS, Engerman SL, Haines R, Shlomowitz R. Transoceanic mortality: the slave trade in comparative perspective. William Mary Q 2001; 58:93-117. [PMID: 18629973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
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Klein HS. [The social and economic integration of Portuguese immigrants in Brazil at the end of the nineteenth century and in the twentieth century]. Rev Bras Estud Popul 1989; 6:17-37. [PMID: 12342854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023] Open
Abstract
"This survey of Portuguese migration to Brazil analyses the Portuguese and Brazilian statistics to determine the volume, timing and quality of Portuguese immigrants to Brazil as well as the importance of Brazil in the overall Portuguese emigration. The patterns of geographic and economic mobility for the Brazilian resident Portuguese is examined, especially for the period since 1900." The analysis suggests that "though their rapid integration into the Brazilian economy may explain their very low rates of return migration--the lowest of the major European immigrants--they were also the most endogamous of the European migrants, having relatively low rates of intermarriage with native Brazilians and other immigrants." (SUMMARY IN ENG)
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Abstract
The purpose of this study is to present measurement of ventilatory threshold (VeT) and maximal oxygen uptake (VO2max) in a large group of predominantly older subjects using a bicycle ergometer and an automated measuring system. One hundred and twenty-seven healthy elderly subjects (mean age: 68) and 44 young and middle-aged subjects (mean age: 39) underwent a maximal exercise test with breath-by-breath measurement of ventilation and gas exchange variables. Ventilatory threshold was determined by visual inspection of the breakpoints in the VE/VO2 and PETO2 data curves. Additional measures were made in a subset of subjects to determine the reproducibility and interobserver variability of VeT and the relationship between VeT and the venous lactate threshold (LaT). Day-to-day reproducibility of VeT was good with a mean difference in VO2 at VeT on two occasions of 40.23 +/- 125 ml/min. Interobserver variability was low (intraclass correlation coefficient of r = 0.941) and VeT was found to correlate to LaT (r = 0.79, P less than 0.05) with LaT occurring a mean 2.3 min after VeT. VeT declined significantly with age in both males and females but less rapidly than VO2max. Both VO2max and VeT were found to vary with age, sex, height, and weight in a stepwise multiple-linear regression analysis. Age-associated changes in skeletal muscle composition may be in part responsible for the less precipitous decline in VeT with age compared with VO2max.
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Affiliation(s)
- J D Posner
- Philadelphia Geriatric Center, Medical College of Pennsylvania, Philadelphia 19141
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Abstract
One of the primary manifestations of ageing is a reduced ability to respond to physiologic challenges. With aging, the ability to perform exercise and physical work declines and is reflected in the reduction in maximal oxygen consumption. Although this decline is influenced to some degree by the state of health and age, it seems that maintenance of regular physical activity significantly counteracts the loss of aerobic capacity. In healthy old age, the cardiovascular system is able to compensate for certain age-associated declines in cardiac function. A program of endurance training, even when begun in old age, can restore more youthful levels of physical fitness and results in tangible improvements in certain resting, submaximal and maximal indicators of exercise capacity. With comprehensive preexercise clinical screening, physical training can be conducted safely with minimal musculoskeletal problems in the aged. The long-term effects of exercise on morbidity, mortality and psychologic function in old age are unknown.
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Klein HS. [Not Available]. Hist Mex 1986; 36:273-286. [PMID: 11635083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Klein HS, Engerman SL. Fertility differentials between slaves in the United States and the British West Indies: a note on lactation practices and their possible implications. William Mary Q 1978; 35:357-374. [PMID: 11633591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Klein HS. [New theory on the nature and causes of dent caries]. Med Hyg (Geneve) 1967; 25:1391. [PMID: 5236781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Klein HS. Notes on a case of ulcerative colitis. Int J Psychoanal 1965; 46:342-51. [PMID: 5834997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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