Varma Vijay R, Tan Erwin J, Wang Tao, Xue Qian-Li, Fried Linda P, Seplaki Christopher L, King Abby C, Seeman Teresa E, Rebok George W, Carlson Michelle C
Johns Hopkins Center on Aging and Health, Baltimore, MD, USA Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
The Corporation for National and Community Service, Washington, DC, USA.
J Appl Gerontol. 2014 Oct;33(7):870-87. doi: 10.1177/0733464813512896. Epub 2013 Dec 11.
Recommended levels of physical activity may represent challenging targets for many older adults at risk for disability, leading to the importance of evaluating whether low-intensity activity is associated with health benefits. We examined the cross-sectional association between low-intensity walking activity (<100 steps/min) and health and physical function in a group of older adults. Participants (N = 187; age = 66.8; 91.4% African American; 76.5% female) wore a StepWatch Activity Monitor to measure components of low-intensity walking activity. Only 7% of participants met physical activity guidelines and moderate-intensity activity (≥100 steps/min) contributed only 10% of the total steps/day and 2% of the total min/day. Greater amount, frequency, and duration of low-intensity activity were associated with better self-report and performance-based measures of physical function, better quality of life, and fewer depressive symptoms (ps < .05). The cross-sectional relationship between low-intensity activity and health outcomes important to independent function suggests that we further explore the longitudinal benefits of low-intensity activity.
对于许多有残疾风险的老年人来说,推荐的身体活动水平可能是具有挑战性的目标,这使得评估低强度活动是否与健康益处相关变得很重要。我们研究了一组老年人中低强度步行活动(<100步/分钟)与健康及身体功能之间的横断面关联。参与者(N = 187;年龄 = 66.8岁;91.4%为非裔美国人;76.5%为女性)佩戴了步数监测活动监测器来测量低强度步行活动的各项指标。只有7%的参与者达到了身体活动指南的要求,中等强度活动(≥100步/分钟)仅占每日总步数的10%和每日总分钟数的2%。低强度活动的量、频率和持续时间越大,与基于自我报告和表现的身体功能测量结果越好、生活质量越高以及抑郁症状越少相关(p值 <.05)。低强度活动与对独立功能很重要的健康结果之间的横断面关系表明,我们应进一步探索低强度活动的纵向益处。