Faculty of Education, Kochi University, Kochi, Japan.
Section of the NILS-LSA, National Center for Geriatrics and Gerontology, Aichi, Japan.
J Am Med Dir Assoc. 2019 Aug;20(8):1032-1036. doi: 10.1016/j.jamda.2019.01.001. Epub 2019 Feb 18.
This study examined the association between frailty development and physical activity including the number of steps, the time of light-intensity physical activity (LPA) with <3.0 metabolic equivalents (METs), and the time of moderate- to vigorous-intensity physical activity (MVPA) with ≥3.0 METs in community-dwelling older Japanese adults.
DESIGN, SETTING, AND PARTICIPANTS: Study subjects were 401 older adults at the baseline examination (April 2000-May 2002) who participated at least once in the follow-up examination of the longitudinal study of aging. Their 1787 cumulative data points (mean number of repeat visits, 3.5) were used for analysis.
The number of steps, time of LPA, and time of MVPA were recorded at baseline using a uniaxial accelerometer. Frailty was defined according to 5 frailty criteria: shrinking, exhaustion, low physical activity, low grip strength, and slow gait speed.
The fully adjusted odds ratio for frailty among subjects walking <5000 steps was 1.85 [95% confidence interval (CI), 1.10-3.11]. The fully adjusted odds ratio for frailty among subjects with MVPA for <7.5 minutes was 1.80 (95% CI, 1.05-3.09). No significant association was observed between frailty and LPA.
The risk for developing frailty was substantially lower in older people walking ≥5000 steps/d or exercising for at least 7.5 minutes/d at an intensity >3.0 METs. These data could be applicable to the community interventions that aim to prevent frailty.
本研究旨在探讨社区居住的日本老年人群中，虚弱发展与体力活动（包括步数、低强度体力活动（LPA）时间（<3.0 代谢当量（METs））和中高强度体力活动（MVPA）时间（≥3.0 METs））之间的关系。
设计、地点和参与者：本研究的研究对象为基线检查（2000 年 4 月至 2002 年 5 月）时 401 名年龄较大的成年人，他们至少参加过纵向老龄化研究的一次随访检查。共使用了他们的 1787 个累积数据点（平均重复就诊次数为 3.5 次）进行分析。
在基线使用单轴加速度计记录步数、LPA 时间和 MVPA 时间。虚弱根据 5 项虚弱标准定义：消瘦、疲劳、低体力活动、低握力和慢步速。
与步数<5000 步的受试者相比，步数<5000 步的受试者虚弱的调整后比值比为 1.85（95%置信区间（CI），1.10-3.11）。MVPA<7.5 分钟的受试者虚弱的调整后比值比为 1.80（95%CI，1.05-3.09）。虚弱与 LPA 之间无显著相关性。
每天行走≥5000 步或至少进行 7.5 分钟/天、强度>3.0 METs 的运动的老年人，发生虚弱的风险明显较低。这些数据可适用于旨在预防虚弱的社区干预措施。
