Aim

To examine associations of intensity-specific physical activity and bout-specific sedentary time with frailty status among Japanese community-dwelling older adults, taking into account the interrelationships of these behaviors.

Methods

Participants were 511 community-dwelling older adults. Physical activity and sedentary time were assessed using a tri-axial accelerometer. Frailty status (frail, pre-frail, or robust) was determined, based on the phenotypic model and used established criteria for Japanese older adults. Associations with frailty status of intensity-specific physical activity and bout-specific sedentary behavior (SB) time were examined using compositional data analysis, adjusted for potential confounders.

Results

Participants included 13 (2.6%) who were frail, 234 (45.8%) pre-frail, and 264 (51.6%) who were robust. For the frail and pre-frail, the proportion of time spent in moderate-to-vigorous physical activity (MVPA) was less than for those who were robust. Frail older adults has larger proportion of time spent in prolonged (≥30 min/bouts) sedentary behavior (SB), and less in short-bout (<30 min/bout) SB, compared to the robust. No statistically-significant differences in the proportion of time spent in light-intensity physical activity was found across frailty levels.

Conclusion

Pre-frail and frail older adults spend proportionally less time in MVPA and more time in prolonged SB, compared with those who were robust. These findings need to be confirmed by evidence from larger and more-diverse study samples and by evidence from prospective studies, in order to better understand whether or not avoiding prolonged periods of sitting could be a potential strategy for preventing frailty among community-dwelling older adults.

中文翻译：

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老年人的体育活动和特定于运动的久坐时间与虚弱状态的关联：NEIGE研究的成分分析

目标

考虑到这些行为之间的相互关系，研究强度特定的体育活动和特定于运动的久坐时间与日本社区居住的老年人的虚弱状态之间的关系。

方法

参加者为511名社区居民。使用三轴加速度计评估身体活动和久坐时间。根据表型模型确定脆弱状态（脆弱，脆弱或脆弱），并使用已建立的日本老年人标准。使用成分数据分析（针对潜在的混杂因素进行了调整）来检查与强度特定的体育活动虚弱状态和特定于回合特定的久坐行为（SB）时间的关联。

结果

参加者包括13名（2.6％）身体虚弱，234名（45.8％）身体虚弱的人和264名（51.6％）健壮的人。对于体弱者和体弱者而言，花在中度到剧烈运动中的时间比例（MVPA）少于那些健壮者。与健壮的人相比，年老体弱的成年人在长时间（≥30分钟/发作）久坐行为（SB）上花费的时间比例更大，而在短时间（<30分钟/发作）静坐行为（SB）上花费的时间比例则更大。在各个脆弱水平上，光强度体育锻炼所花费的时间比例没有统计学上的显着差异。

结论

与健壮的人相比，衰弱前和衰弱的老年人在MVPA上花费的时间成比例地减少，而在SB延长上花费的时间更多。为了更好地了解避免长时间坐着是否可能是预防社区居住的老年人身体虚弱的潜在策略，这些发现需要得到来自更大，更多样化的研究样本的证据以及来自前瞻性研究的证据的证实。 。