Associations between sedentary behaviour and body composition, muscle function and sarcopenia in community-dwelling older adults

Abstract Context: High vitamin D and physical activity (PA) levels are independently associated with improved body composition and muscle function in older adults. Objective: The objective of this study was to investigate the interaction of 25-hydroxyvitamin D (25OHD) and PA status in maintenance of body composition and muscle function in older adults. Design and Setting: This was a 5-year prospective population-based study of Australian community-dwelling older adults. Participants: Participants in the study included 615 community-dwelling volunteers aged 50 years old or older [61.4 ± 6.9 (mean ± SD) y; 48% female] randomly selected from electoral rolls and categorized according to baseline serum 25OHD (≥ or <50 nmol/L) and PA (≥ or <10 000 pedometer determined steps/d) levels as follows: high 25OHD and high PA (VitD+PA+); high 25OHD and low PA (VitD+PA−); low 25OHD and high PA (VitD-PA+); and low 25OHD and low PA (VitD-PA−). A subset of 518 participants completed accelerometer assessments during follow-up. Main Outcome Measures: Changes in dual-energy X-ray absorptiometry-assessed body composition and lower-limb muscle function were measured. Results: VitD+PA+ had significantly smaller increases in body fat over 5 years compared with other groups (all P < .05). Higher baseline pedometer-determined PA resulted in declines in total body fat (β = −.23 kg per 100 steps/d, P = .001) over 5 years for participants with high 25OHD but not those with low 25OHD (P > .05). Among participants with accelerometer data, these associations were generally mediated by higher levels of moderate/vigorous PA. Conclusions: High vitamin D status appears to enhance PA-related declines in body fat during aging, but the mechanism may be greater amounts of outdoor moderate/vigorous PA rather than a direct effect of 25OHD.

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PP022-MON BODY COMPOSITION AND PHYSICAL FUNCTION IN HEALTHY COMMUNITY-DWELLING OLDER ADULTS IN SWEDEN, A CROSS-SECTIONAL STUDY

Clinical Nutrition ◽

10.1016/s0261-5614(13)60334-9 ◽

2013 ◽

Vol 32 ◽

pp. S131

Author(s):

A. Lindblad ◽

S. Dahlin-Ivanoff ◽

I. Bosaeus ◽

E. Rothenberg

Keyword(s):

Older Adults ◽

Body Composition ◽

Physical Function ◽

Cross Sectional Study ◽

Community Dwelling ◽

Sectional Study ◽

Cross Sectional ◽

Healthy Community ◽

Community Dwelling Older Adults

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Every step counts: synthesising reviews associating objectively measured physical activity and sedentary behaviour with clinical outcomes in community-dwelling older adults

The Lancet Healthy Longevity ◽

10.1016/s2666-7568(21)00203-8 ◽

2021 ◽

Vol 2 (11) ◽

pp. e764-e772

Author(s):

Keenan A Ramsey ◽

Carel G M Meskers ◽

Andrea B Maier

Keyword(s):

Physical Activity ◽

Older Adults ◽

Sedentary Behaviour ◽

Clinical Outcomes ◽

Community Dwelling ◽

Step Counts ◽

Objectively Measured ◽

Community Dwelling Older Adults ◽

Objectively Measured Physical Activity

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Body Composition in Community-Dwelling Older Adults Before and After SARS-CoV-2 Infection: A Longitudinal Prospective Study in a Rural Village Struck by the Pandemic

Journal of Primary Care & Community Health ◽

10.1177/21501327211047781 ◽

2021 ◽

Vol 12 ◽

pp. 215013272110477

Author(s):

Oscar H. Del Brutto ◽

Robertino M. Mera ◽

Denisse A. Rumbea ◽

Pedro Pérez ◽

Bettsy Y. Recalde ◽

...

Keyword(s):

Physical Activity ◽

Older Adults ◽

Body Composition ◽

Regression Models ◽

Community Dwelling ◽

The Body ◽

Study Results ◽

The Impact ◽

Community Dwelling Older Adults

Background: Information on the body composition of inhabitants of remote communities during the SARS-CoV-2 pandemic is limited. Using a longitudinal population-based study design, we assessed the association between SARS-CoV-2 infection and changes in body composition. Methods: Community-dwelling older adults living in a rural Ecuadorian village received body composition determinations before and 1 year after the pandemic as well as serological tests for detection of SARS-CoV-2 antibodies. The independent association between SARS-CoV-2 infection and abnormalities in body composition at follow-up was assessed by fitting linear mixed models for longitudinal data. Results: Of 327 enrolled individuals, 277 (85%) received baseline and follow-up body composition determinations, and 175 (63%) of them became SARS-CoV-2 seropositive. Overall, diet and physical activity deteriorated during the follow-up. Multivariate random-effects generalized least squares regression models that included the impact of time and seropositivity on follow-up body composition, showed that neither variable contributed to a worsening in body composition. Multivariate logistic regression models disclosed that the serological status at follow-up cannot be predicted by differences in body composition and other baseline covariates. Conclusions: Study results suggest no increased susceptibility to SARS-CoV-2 infection among older adults with abnormal body composition and no significant changes as a result of worse physical activity and dietary habits or seropositivity during the length of the study. Together with a previous study in the same population that showed decrease in hand-grip strength after SARS-CoV-2, results confirm that dynapenia (and not sarcopenia) is associated with SARS-CoV-2 infection in older adults.

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