Abstract
A decrease in daily physical activity (DPA) leads to a decline in both cardiorespiratory fitness and functional fitness in older adults. We hypothesized that a biaxial accelerometer can be utilized as an indirect measure of these variables. If caloric expenditure is related to cardiovascular fitness, the measurement of caloric expenditure by accelerometer may be useful in indirectly assessing oneüfs cardiorespiratory fitness. PURPOSE: To determine if caloric expenditure and activity intensity as assessed by accelerometer are related to cardiorespiratory fitness and functional fitness in community-dwelling healthy older female. METHODS: Biaxial accelerometers were used to determine quantity and quality of DPA in thirty-nine community-dwelling older female adults (68 ± 5 yr) in Japan. RESULTS: The mean (± SD) total daily energy expenditure (TDEE) was 1577 ± 188 kcal/day. Performance on the 12-minute Walk Test was positively associated with TDEE (r = 0.32, p < 0.05). and DPA at intensity 5 & 6 of the accelerometer scale (moderate intensity) (r = 0.32, p < 0.05). Leg extension power and chair stand were not significantly associated with TDEE but exhibited a trend toward positive association with moderate intensity DPA (r = 0.28 & r = 0.29, p < 0.10). CONCLUSION: The results of this study indicate that caloric energy expenditure and activity intensity, as measured by biaxial accelerometers, are related to measures of cardiorespiratory and functional fitness in a relatively healthy older population. DPA was correlated with cardiovascular endurance and exhibited a trend towards positive association with measures of lower body muscular strength. Although additional research is warranted, this study supports the efficacy of using biaxial accelerometers to indirectly assess cardiovascular endurance and functional fitness in a healthy older adult population.
Published Version
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