The Role of Muscle Mass, Muscle Quality, and Body Composition in Risk for the Metabolic Syndrome and Functional Decline in Older Adults

Bidirectional association between sarcopenia and diabetes: A prospective cohort study in middle-aged and elderly adults

BACKGROUND AND AIMS

Sarcopenia and diabetes are prevalent diseases among middle-aged and elderly population. This study aimed to investigate the bidirectional association between sarcopenia and diabetes.

METHODS

This study comprised two longitudinal analyses. In cohort 1, the association between baseline diabetes and the risk of new-onset sarcopenia was assessed. In cohort 2, the association between baseline sarcopenia and the risk of new-onset diabetes was examined. Multivariate logistic regression models were used to calculate odds ratios (OR) and 95 % confidence intervals (95 % CI). Cross-lagged panel analysis was used to further validate their bidirectional associations.

RESULTS

Significant bidirectional associations were observed between sarcopenia and diabetes in both cross-sectional and longitudinal analyses (P < 0.05). After four years of follow-up, low handgrip strength (OR: 2.31, 95 % CI: 1.74-3.08) and appendicular skeletal muscle mass index (ASM/Ht2) (OR: 1.25, 95 % CI: 1.20-1.30) were associated with an increased risk of diabetes. Conversely, elevated fasting plasma glucose (FPG) (OR: 1.52, 95 % CI: 1.17-1.96) and glycated hemoglobin A1c (HbA1c) (OR: 1.35, 95 % CI: 1.05-1.73) were associated with a higher risk of sarcopenia. Cross-lagged analysis further confirmed their bidirectional longitudinal association.

CONCLUSIONS

This study identified significant longitudinal bidirectional association between sarcopenia and diabetes, highlighting that each condition serves as a risk factor for the other. Clinically, early assessments of handgrip strength and ASM/Ht2 may aid in diabetes prevention, while monitoring FPG and HbA1c could help reduce the risk of sarcopenia.

"No Matter the Age or Medical Complexity, People Benefit From That Intensity of Exercise": A Mixed-Methods Study Describing Rehabilitation Provider Perceptions of High-Intensity Resistance Training Among Veterans Receiving Post-Acute Care

BACKGROUND

In skilled nursing facilities (SNFs), i-STRONGER is a novel, high-intensity resistance training approach that incorporates progressive resistance training to promote greater improvements in patient function compared to usual care. To inform large-scale expansion of i-STRONGER as standard-of-care in SNFs, this mixed-methods study assessed rehabilitation providers' perceptions of i-STRONGER and purported needs for its adoption.

METHODS

Forty-three rehabilitation providers participated in an 18-week, interactive i-STRONGER training program. Post-training, the validated Perceived Characteristics of Intervention Scale was used to evaluate i-STRONGER relative advantage, compatibility with practice, complexity, potential for reinvention (ie, adaptability), trialability, and risk. Providers reported the top 3 needs for successful i-STRONGER adoption and described i-STRONGER perceptions in training modules and focus groups. A convergent mixed-methods design was used to evaluate and describe clinician perceptions of i-STRONGER.

RESULTS

i-STRONGER program conceptually aligned with providers' practice. The patterns and was endorsed as feasible and adaptable as part of patient care; however, initial hesitancies surrounding patients' physical abilities and motivation were noted as barriers and appeared to reflect negative age-related beliefs and attitudes within SNF cultures. Providers feared patients would be unwilling or unable to engage with i-STRONGER activities due to their age, deconditioning, medical complexity, or expectation that rehabilitation should feel "easier." As providers began implementing i-STRONGER in real-time, concerns surrounding i-STRONGER's potential risks lessened as providers observed improvements in patient function and motivation, and patients were described as "embracing" i-STRONGER principles. Patient acceptance and satisfaction, equipment, time, and clear communication among providers were cited as critical needs for i-STRONGER adoption.

CONCLUSIONS

With i-STRONGER, a safe and effective approach for delivering resistance training to older adults in SNF settings, "seeing is believing." Real-time implementation of i-STRONGER facilitated an evolution of perspective among providers, fueled by observable, positive changes in patient function and affect as well as unexpected patient participation. Findings support i-STRONGER use in SNF settings, provided that specific training strategies showcase older adults with medical complexity participating in progressive resistance training.

Changes in muscle-to-fat ratio are associated with lung function decline and airflow obstruction in the general population

BACKGROUND

The long-term relationship between body composition and lung function has not yet been fully demonstrated. We investigated the longitudinal association between muscle-to-fat (MF) ratio and lung function among middle-aged general population.

METHODS

Participants were enrolled from a community-based prospective cohort between 2005 and 2014. Lung function parameters (forced vital capacity [FVC], forced expiratory volume in 1 s [FEV1], and FEV1/FVC) and the MF ratio (total body muscle mass [kg]/fat mass [kg]) were assessed biannually via spirometry and bioelectrical impedance analysis, respectively.

RESULTS

We followed up 4,712 participants (age 53.9 ± 7.9 years, men 45.8%) for 8 years. With an increase in MF ratio of 1, in men, the FVC increased by 43.9 mL, FEV1 by 37.6 mL, and FEV1/FVC by 0.320%, while in non-smoking women, the FVC increased by 55.8 mL, FEV1 by 44.3 mL, and FEV1/FVC by 0.265% (all P < 0.001). The MF ratio-decreased group showed further annual deterioration in lung function than the MF ratio-increased group (men: FVC - 44.1 mL vs. -28.4 mL, FEV1 -55.8 mL vs. -39.7 mL, FEV1/FVC - 0.53% vs. -0.42%; non-smoking women: FVC - 34.2 mL vs. -30.3 mL, FEV1 -38.0 mL vs. -35.2 mL; all P < 0.001, except FEV1 in non-smoking women; P = 0.005). The odds ratio for the incidence of airflow obstruction according to the MF ratio was 0.77 (95% CI, 0.68-0.87) in men and 0.85 (95% CI, 0.74-0.97) in non-smoking women.

CONCLUSIONS

Long-term changes in the MF ratio are related to lung function deterioration and incidence of airflow obstruction in middle-aged general population.

Efficacy of convenience meal-type foods designed for diabetes in the management of metabolic syndrome based on a 3-week trial

OBJECTIVES

This study aimed to assess the effect of meal-type food for diabetes on improving metabolic syndrome risk factors in adults.

METHODS

The participants were adult men and women aged 40-55 y with 1 or more risk factors for metabolic syndrome. They were provided with a diabetic diet (a meal-type food) and general diet in the form of home meal replacement for 3 wk. The current research used a crossover design. All participants had iso-caloric meal replacement per day, and there was a 2-wk washout period between each diet. The nutritional standards of a diabetic diet were based on the guidelines of the Ministry of Food and Drug Safety, which are: <50% carbohydrates, <10% sugars, <7% saturated fat, and >10 g dietary fiber. The average caloric content was 489.1 ± 45.0 kcal. The composition of the general diet was similar to that of the diabetic diet; however, there were differences in sugar content. In total, 15 participants were included in the research, and there was no significant difference between the 2 groups in terms of nutrient intake during the intervention period.

RESULTS

Body weight (P = 0.001), body mass index (P = 0.004), waist circumference (P = 0.030), triacylglycerol (P = 0.002), total cholesterol (P = 0.001), and low-density lipoprotein cholesterol (P = 0.008) levels were significantly lower in the diabetic diet intervention period than before and after 3 wk of the intervention. In addition, reduction in body weight (P = 0.001), body mass index (P = 0.006), waist circumference (P = 0.032), and triacylglycerol (P = 0.036) and total cholesterol (P = 0.007) levels in the diabetic diet intervention period significantly differed compared with those in the general diet intervention period.

CONCLUSIONS

Replacing 1 meal per day with meal-type food for diabetes improved body composition and blood lipid levels in adults with metabolic syndrome risk factors.

The Relationship Between Muscle Strength and Body Composition Measures and Cancer-Related Fatigue: A Systematic Review and Meta-Analysis

PROBLEM IDENTIFICATION

Cancer-related fatigue (CRF) substantially affects daily living and quality of life, but objective CRF measures remain limited. This review aimed to identify the correlation between muscle strength and body composition measures and CRF, as well as potential objective indicators for assessing CRF.

LITERATURE SEARCH

PubMed®, MEDLINE®, CINAHL®/PsycINFO®, and Embase® were searched for studies published from January 2000 to January 2021.

DATA EVALUATION

Study selection and quality assessment were conducted using the Critical Appraisals Skills Programme checklist and the Strengthening the Reporting of Observational Studies in Epidemiology statement. Comprehensive Meta-Analysis software was used to perform meta-analysis.

SYNTHESIS

25 studies were selected, and 19 measures were analyzed. CRF negatively correlated with hand grip strength, knee extensor strength, and the sit-to-stand test. No significant correlation was found between body composition measures and CRF.

IMPLICATIONS FOR NURSING

The evidence suggests that muscle strength measures may be potential indicators for CRF assessment. Combining objective and subjective CRF assessments could assist clinicians in evaluating the effectiveness of CRF interventions more accurately.

Dynapenic abdominal obesity in hospitalized elderly patients with acute myocardial infarction

Obesity and dynapenia are cardiovascular risk factors. When present together, it is called dynapenic abdominal obesity and can potentiate adverse outcomes. This study aims to estimate the prevalence of dynapenic abdominal obesity and its relationship with prognostic markers in patients with acute myocardial infarction (AMI). This is a hybrid study with a longitudinal component plus a cross-sectional component at baseline involving elderly patients admitted to a reference hospital in cardiology due to AMI in the Brazilian Northeast from May to October 2015. We analyzed patients' admission data and evaluated some prognostic markers up to two years after admission. We established abdominal obesity by measuring waist circumference (>102 cm for men and >88 cm for women) and dynapenia by handgrip strength (<27 kg/F for men and <16 kg/F for women). We considered the prognostic markers troponin and creatinine kinase - MB (CKMB), AMI classification according to ST segment elevation, TIMI score, need for coronary angioplasty or coronary artery bypass surgery, complications during hospitalization and within two years after admission, and re-admission to the same service. We evaluated 92 patients with a mean age of 71.4 ± 7.5 years. The prevalence of abdominal obesity and dynapenia was 56.5% and 44.6%, respectively. The coexistence of the two conditions occurred in 25.0% of the patients, being higher among women (p < 0.001). When comparing the dynapenic abdominal obese groups with the group of patients who had one of the two isolated conditions we observed that, for a same mean age and clinical characteristics, patients with only one of the conditions had a higher CKMB (p = 0.046) and troponin median (p = 0.032). The presence of dynapenia in the groups of abdominal obese and non-abdominal obese individuals is not associated with risk marker parameters (p > 0.05). High prevalence of abdominal obesity and dynapenia occurred among patients with AMI and in a quarter of these both conditions coexisted. Dynapenic abdominal obesitydoes not increase the risk of adverse outcomes and isolated dynapenia is not a marker of a poor prognosis.

Metabolic syndrome and the benefit of a physical activity intervention on lower-extremity function: Results from a randomized clinical trial

BACKGROUND

In older adults, increases in physical activity may prevent decline in lower-extremity function, but whether the benefit differs according to metabolic syndrome (MetS) status is uncertain. We aim to investigate whether structured physical activity is associated with less decline in lower-extremity function among older adults with versus without MetS.

METHODS

We used data from the multicenter Lifestyle Interventions and Independence for Elders (LIFE) study to analyze 1535 sedentary functionally-vulnerable women and men, aged 70 to 89 years old, assessed every 6 months (February 2010-December 2013) for an average of 2.7 years. Participants were randomized to a structured, moderate-intensity physical activity intervention (PA; n = 766) or health education program (HE; n = 769). MetS was defined according to the 2009 multi-agency harmonized criteria. Lower-extremity function was assessed by 400-m walking speed and the Short Physical Performance Battery (SPPB) score.

RESULTS

763 (49.7%) participants met criteria for MetS at baseline. Relative to HE, PA was associated with faster 400-m walking speed among participants with MetS (P < 0.001) but not among those without MetS (P = 0.91), although the test for statistical interaction was marginally non-significant (P = 0.07). In contrast, no benefit of PA versus HE was observed on the SPPB score in either MetS subgroup.

CONCLUSIONS

Among older adults at high risk for mobility disability, moderate-intensity physical activity conveys significant benefits in 400-m walking speed but not SPPB in those with, but not without, MetS. The LIFE physical activity program may be an effective strategy for maintaining or improving walking speed among vulnerable older adults with MetS.

TRIAL REGISTRATION

clinicaltrials.gov Identifier: NCT01072500.

Factors associated with frailty transition at different follow-up intervals: A scoping review

Frailty is a dynamic process. Identifying the factors associated with frailty transition may increase the opportunities for success in interventions for frailty. This scoping review, following Arksey and O'Malley's methodological framework, aimed to identify the factors associated with frailty transition and the rate of frailty transition among community-dwelling older people. A literature search was conducted. Among the included studies, 5, 13, and 3 involved follow-up intervals of 2-3 years (short term), 4-6 years (intermediate term), and >6 years (long term), respectively. Reportedly, life course characteristics, diseases, and psychological factors were related to frailty transitions at all follow-up intervals. Physical factors were related to frailty transition at both short and intermediate follow-up intervals, while social factors were related to frailty transition at intermediate follow-up intervals. The rate of improvement in frailty seemed to decrease, and that of worsening seemed to increase when the follow-up intervals lengthened.

[Relationship between fibroblast growth factor-21, muscle mass, and function outcomes in overweight and obese older adults living in the community. An exploratory study]

BACKGROUND

Age-related decreases in muscle mass and function are associated with the development of metabolic impairments, particularly in the context of obesity. Fibroblast growth factor21 (FGF-21) has been suggested as a common mediator of both processes. No known studies have examined the association between FGF-21 and muscle mass and function in overweight or obese older adults. With this in mind, this study aimed to investigate the association between plasma levels of FGF-21 and muscle mass and function outcomes in overweight or obese older adults.

MATERIALS AND METHODS

Exploratory study, which included 39 adults of 60-70years old with body mass indexes >25kg/m². As study outcomes, measurements were made of appendicular muscle mass (AMM), grip strength, 5 times sit-to-stand test (5xSTT), as well as plasma levels of FGF-21, fasting glucose, and insulin. The homeostatic model assessment index (HOMA-IR) was also calculated to determine the presence of insulin resistance.

RESULTS

Significant relationships were found between plasma levels of FGF-21 vs 5xSTT (rho=0.49; P<.05). Moreover, FGF-21 levels were significantly higher in those with insulin resistance (P<.05), as well as with having lower levels of AMM (P<.05).

CONCLUSION

There is a relationship between the plasma levels of FGF-21 and muscle function outcomes in overweight or obese older adults. Future studies should investigate the potential causalities between these relationships.

Muscle Quality Is Associated with History of Falls in Octogenarians

OBJECTIVES

The aim of this study was to compare muscle quality (MQ) between octogenarians classified as non-fallers, fallers and recurrent fallers and identify confounding intrinsic and extrensic factors that impact likelihood for falls.

DESIGN

This observational, descriptive, cross-sectional study included older adults (N=220) aged 80 years or older.

MEASUREMENTS

The Short Physical Performance Battery (SPPB) was used to evaluate physical function and MQ was calculated using the ratio of grip strength to arm muscle mass (in kilograms) quantified by DXA. Variables related to sociodemographic, clinical, cognitive function, and falls were evaluated using a questionnaire and symptoms of depression were evaluated by the Geriatric Depression Scale (GDS). A Kruskal-Wallis H test was used to verify differences between groups. Binomial logistic regression was performed to determine the impact of age, depression, polypharmacy, balance, MQ, and sex on participants having more than four falls in their history.

RESULTS

Increasing MQ was associated with reduced likelihood of more than four falls in their history. Non-fallers were statistically younger (p = 0.012) and took more medications (p = 0.023) than recurrent fallers. Recurrent fallers had lower MQ when compared with fallers (p = 0.007) and non-fallers (p = 0.001) and had a lower GDS score when compared with fallers (p = 0.022). Finally, fallers presented lower scores for balance when compared to non-fallers (p = 0.013).

CONCLUSION

A higher MQ is associated with a reduction in the likelihood falls in octogenarians. Therefore, it may be advantageous for clinicians to evaluate MQ when the screening of the risk of falls in older adults.

Important lessons about testosterone therapy- weight loss vs. testosterone therapy for symptom resolution, classical vs. functional hypogonadism, and shortterm vs. lifelong testosterone therapy

In this commentary, we highlight important findings from a notable RCT by Ng Tang Fui et al. 2016 which investigated the effects of testosterone treatment in dieting obese men. First, a myopic focus on weight loss can detract from important improvements in body composition. Second, while weight loss in obese men may increase testosterone levels, this increase is commonly not enough to result in an improvement in symptoms associated with testosterone deficiency. Third, the RCT by Ng Tang Fui et al. adds evidence to the growing number of clinical trials showing that testosterone therapy should not be restricted to men with classical hypogonadism. Finally, the beneficial effects of testosterone therapy are not maintained after cessation of treatment. Currently, the British Society for Sexual Medicine guidelines are the only clinical guidelines which acknowledge that weight loss per se does not automatically translate to resolution of hypogonadal symptoms, that testosterone therapy can greatly benefit men with testosterone deficiency who do not have classical hypogonadism, and that cessation of testosterone therapy causes reappearance of symptoms and reversal of benefits. Lifelong testosterone therapy is therefore recommended for persistent health benefits in most men with testosterone deficiency. Physicians and patients need to be informed of this.

Intensity of resistance training via self-reported history is critical in properly characterizing musculoskeletal health

BACKGROUND

Intensity of resistance training history might be omitted or poorly ascertained in prescreening or data questionnaires involving musculoskeletal health. Failure to identify history of high-versus low-intensity training may overlook higher effect sizes with higher intensities and therefore diminish the precision of statistical analysis with resistance training as a covariate and bias the confirmation of baseline homogeneity for experimental group designation. The purpose was to determine the degree to which a single question assessing participant history of resistance training intensity predicted differences in musculoskeletal health.

METHODS

In the first research aim, participants were separated into groups with a history (RT) and no history (NRT) of resistance training. The second research aim evaluated the history of resistance training intensity on muscular strength, lean mass, and bone mineral density (BMD), RT participants were reassigned into a low- (LIRT) or high-intensity resistance training group (HIRT). 83 males and 87 females (19.3 ± 0.6 yrs., 171.1 ± 9.9 cm, 67.1 ± 10.5 kg, 22.9 ± 2.8 BMI, 26.2 ± 7.2% body fat) completed handgrip dynamometry (HG) and dual-energy x-ray absorptiometry scans (DXA) for BMD and bone mineral-free lean mass (BFLM).

RESULTS

A 3-group method (NRT, LIRT, HIRT) reduced type-I error compared with the 2-group method (NRT, RT) in characterizing the likely effects of one's history of resistance training. For the second aim, HIRT had significantly (p < 0.05) greater HG strength (76.2 ± 2.2 kg) and arm BFLM (6.10 ± 0.16 kg) than NRT (67.5 ± 1.3 kg; 4.96 ± 0.09 kg) and LIRT (69.7 ± 2.0 kg; 5.42 ± 0.14 kg) while also showing significantly lower muscle quality (HG/BFLM) than NRT (13.9 ± 0.2 vs. 12.9 ± 0.3). HIRT had greater BMD at all sites compared to NRT (whole body = 1.068 ± 0.008 vs. 1.120 ± 0.014; AP spine = 1.013 ± 0.011 vs. 1.059 ± 0.019; lateral spine = 0.785 ± 0.009 vs. 0.846 ± 0.016; femoral neck = 0.915 ± 0.013 vs. 0.970 ± 0.022; total hip = 1.016 ± 0.012 vs. 1.068 ± 0.021 g/cm2) while LIRT revealed no significant skeletal differences to NRT.

CONCLUSIONS

Retrospective identification of high-intensity history of resistance training appears critical in characterizing musculoskeletal health and can be ascertained easily in as little as a single, standalone question. Both retrospective-questionnaire style investigations and pre-screening for potential participation in prospective research studies should include participant history of resistance training intensity.

Relevance to assess and preserve muscle strength in aging field

According to the revised European consensus on sarcopenia, muscle strength is the primary parameter of sarcopenia and is associated with adverse outcomes or physical limitation. This literature review aims to clarify how and why to measure and preserve muscle strength in older population. Overall, the relationship between muscle strength and physical function is impacted by level of muscle mass, the degree of obesity (BMI), age and physical activity. Therefore, these factors are to be considered in the evaluation of muscle strength. It is necessary to have objective, reliable and sensitive tools to assess muscle strength, in different populations to detect and quantify weakness, to adapt physical exercises to patients' capacity and to evaluate the effects of treatment. Handgrip strength measurement might be reasonable for clinical practice while the measurement of knee flexors/extensors strength with both 1RM and dynamometers is increasingly important yet restricted by the requirement of special equipment. Physical activity and nutrition are two important behavioral factors to maintain muscle strength. Combined exercise and nutrition interventions improved muscle strength to a more prominent degree than exercise or nutrition alone.

Metabolic Syndrome and Its Associations with Components of Sarcopenia in Overweight and Obese Older Adults

Ageing, obesity and the metabolic syndrome (MetS) may all contribute to poor muscle health (sarcopenia). This study aimed to determine the cross-sectional associations between MetS (International Diabetes Federation classification) and sarcopenia (revised European Working Group on Sarcopenia in Older People definition) in 84 overweight and obese older adults. Components of sarcopenia included muscle strength (hand grip and leg extension), physical performance (stair climb test and short physical performance battery (SPPB), including gait speed and repeated chair stands time), muscle mass (appendicular lean mass (ALM), dual-energy X-ray absorptiometry), muscle size (peripheral quantitative computed tomography-determined calf and forearm cross-sectional area (CSA)) and muscle quality (muscle density and strength normalised to lean mass). Waist circumference was associated with greater muscle size, but poorer leg extension strength, chair stands and stair climb time, gait speed, SPPB scores and muscle quality measures (all p < 0.05). MetS was positively associated with ALM and forearm muscle CSA, and negatively associated with muscle quality measures and chair stands time (all p < 0.05). MetS is associated with larger muscle size, yet poorer muscle quality in overweight and obese older adults. Assessments of muscle function and quality should be considered for obese older adults and those with MetS.

Abdominal obesity as a risk factor for disability in Brazilian older adults

OBJECTIVE

To assess the role of abdominal obesity in the incidence of disability in older adults living in São Paulo, Brazil, in a 5-year period.

DESIGN

Longitudinal study, part of the SABE Study (Health, Wellbeing and Aging). We assessed the disability incidence in the period (reported difficulty in at least one activity of daily living (ADL) in 2010) in relation to abdominal obesity in 2006 (waist circumference ≥102 cm in men and ≥88 cm in women). We used Poisson regression to evaluate the association between obesity and disability incidence, adjusting for sociodemographic and clinical factors including BMI.

SETTING

São Paulo, Brazil.

SUBJECTS

Older adults (n 1109) who were independent in ADL in 2006. In 2010, 789 of these were located and re-interviewed.

RESULTS

The crude disability incidence (at least one ADL) was 27·1/1000 person-years in the period. The incidence rate was two times higher in participants with abdominal obesity compared with those without (39·1/1000 and 19·4/1000 person-years, respectively; P<0·001). This pattern was observed in all BMI levels. In regression models, abdominal obesity remained associated with disability incidence (incidence rate ratio=1·90; P<0·03), even after controlling for BMI, gender, age, low grip strength, cognitive impairment, physical inactivity and chronic diseases.

CONCLUSIONS

Abdominal obesity was strong risk factor for disability, showing a more significant effect than BMI, and thus should be an intervention target for older adults. Waist measure is simple, cost-effective and easily interpreted, and therefore can be used in several settings to identify individuals at higher risk of disability.