Objective: The purpose of this study was to examine the relationship between low bone mass, low muscle mass, and physical activity in community-dwelling older adults.
Methods: Data obtained from 173 older adults who participated in a community-based health-check survey (Tarumizu Study 2018) were analyzed. Bone mass was measured using the speed of sound (SOS) of the calcaneal bone and was considered low when the percentage of the %YAM of the SOS was ≤70%. Muscle mass was assessed based on the criteria for sarcopenia by the AWGS. Physical activity was measured using an accelerometer to determine whether there was an increase in sedentary activity time, a decrease in MVPA time, and a decrease in step count Classified. The groups were classified into healthy (normal bone and muscle masses), low bone mass (only bone mass decreased), low muscle mass (only muscle mass decreased), and low bone/muscle mass groups (both bone and muscle masses decreased).
Results: As a result of logistic regression analysis, MVPA time was significantly decreased in the bone loss and muscle loss groups compared with the normal group (odds ratio, 3.29; p<0.05; covariates: age [5 years], sex, depression tendency, and decreased walking speed).
Conclusion: This study indicated that MVPA levels were lower in the older adults who had lower bone and muscle masses.
"},{"@language":"ja","@value":"【目的】地域在住高齢者における骨量・筋量低下と身体活動との関連性を明らかにすることを目的とした。【方法】地域コホート研究（垂水研究2018）に参加した地域在住高齢者173 名を分析対象とした。骨量低下は％YAM が70% 以下とし，筋量低下は四肢骨格筋指数がサルコペニアの基準より低いものとした。身体活動量は3 軸加速度計を用いて，座位行動時間延長，中高強度身体活動時間低下，歩数低下の有無に分類した。骨量・筋量をもとに正常群，骨量低下群，筋量低下群，骨量・筋量低下群の4 群に分類し，基本情報および身体活動を比較した。【結果】骨量・筋量低下群は正常群と比べて中高強度身体活動時間が有意に減少していた（オッズ比3.29，p < 0.05，共変量：年齢（5 歳階級），性別，歩行速度低下，うつ傾向）。【結論】骨量・筋量低下を併存している高齢者は，中高強度身体活動時間が減少していることが示唆された。
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