Peacock Leslie, Hewitt Allan, Rowe David A, Sutherland Rona
Physical Activity for Health Research Group, University of Strathclyde, Glasgow, United Kingdom.
J Aging Phys Act. 2014 Apr;22(2):276-83. doi: 10.1123/japa.2012-0333. Epub 2013 Jun 24.
The study investigated (a) walking intensity (stride rate and energy expenditure) under three speed instructions; (b) associations between stride rate, age, height, and walking intensity; and (c) synchronization between stride rate and music tempo during overground walking in a population of healthy older adults.
Twenty-nine participants completed 3 treadmill-walking trials and 3 overground-walking trials at 3 self-selected speeds. Treadmill VO2 was measured using indirect calorimetry. Stride rate and music tempo were recorded during overground-walking trials.
Mean stride rate exceeded minimum thresholds for moderate to vigorous physical activity (MVPA) under slow (111.41 ± 11.93), medium (118.17 ± 11.43), and fast (123.79 ± 11.61) instructions. A multilevel model showed that stride rate, age, and height have a significant effect (p < .01) on walking intensity.
Healthy older adults achieve MVPA with stride rates that fall below published minima for MVPA. Stride rate, age, and height are significant predictors of energy expenditure in this population. Music can be a useful way to guide walking cadence.
本研究调查了（a）在三种速度指令下的步行强度（步频和能量消耗）；（b）步频、年龄、身高与步行强度之间的关联；以及（c）健康老年人在地面行走过程中步频与音乐节奏之间的同步情况。
29名参与者以3种自选速度完成了3次跑步机步行试验和3次地面行走试验。使用间接量热法测量跑步机上的耗氧量。在地面行走试验期间记录步频和音乐节奏。
在慢速（111.41±11.93）、中速（118.17±11.43）和快速（123.79±11.61）指令下，平均步频超过了中度至剧烈身体活动（MVPA）的最低阈值。一个多层次模型表明，步频、年龄和身高对步行强度有显著影响（p<.01）。
健康老年人通过低于已公布的MVPA最低值的步频实现了MVPA。步频、年龄和身高是该人群能量消耗的重要预测因素。音乐可以成为指导步行节奏的有用方式。
