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Isotemporal Substitution of Sedentary Behavior and Physical Activity on Function
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4 2018
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Source: Med Sci Sports Exerc. 50(4):792-800
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Alternative Title:Med Sci Sports Exerc
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Description:PURPOSE
To examine the association of substituting SB time with LPA and MVPA on physical function in older adults.
METHODS
Ninety-one older adults (mean age: 70.7 ± 10.2 yr) wore a hip-mounted accelerometer to measure SB, LPA, and MVPA time. Measures of physical function included a 400m walk test (400W), usual gait speed (UGS), and 5-time sit-to-stand (5xSTS), and the short physical performance battery (SPPB). Isotemporal substitution regression modeling was performed to assess the relationship of replacing the amount of time spent in one activity for another.
RESULTS
Replacing 30 min∙d−1 of SB with LPA was associated with a significant improvement in 400W (p = 0.0497), while MVPA resulted in a significant improvement (p < 0.01) in 400W, UGS, 5xSTS, and SPPB. Replacing 60 min∙d−1 of SB with 10 min∙d−1 of MVPA and 50 min∙d−1 of LPA was associated with significant improvements in the 400W, UGS, and 5xSTS (p < 0.05). Meanwhile, as little as 5 min∙d−1 of MVPA and 55 min∙d−1 of LPA was linked to a 78% increased odds of scoring with good function in the SPPB (p = 0.0247).
CONCLUSION
Replacing SB with LPA was linked to a significant improvement in the 400W, but not the other brief functional measures. Mixed doses of LPA and MVPA may add flexibility to interventions targeting reductions of SB in older adults for clinically relevant improvements in physical function.
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Pubmed ID:29140899
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Pubmed Central ID:PMC5856586
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