Determination of Step Rate Thresholds Corresponding to Physical Activity Intensity Classifications in Adults
Determination of Step Rate Thresholds Corresponding to Physical Activity Intensity Classifications in Adults
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DOI：
10.1123/jpah.8.1.45
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发表时间：
2011-01-01
影响因子：
3.1
通讯作者：
Beighle, Aaron
中科院分区：
文献类型：
--
作者：
Abel, Mark;Hannon, James;Beighle, Aaron
背景：目前的建议要求成年人以中等和/或剧烈的强度进行体力活动。考虑到步行和跑步的普及，步频的使用可以提供一种实用且廉价的方法来评估步行强度。因此，本研究的目的是确定对应于各种强度分类的步频阈值。研究方法：在9名男性和10名女性（28.8 ± 6.8岁）中，在休息时和10分钟的跑步机步行和跑步试验中以6种标准速度（54、80、107、134、161和188 m.min（-1））测量氧消耗量。两名观察员计算了参与者在每个跑步机速度下的步数。线性和非线性回归分析被用来开发预测方程，以确定在不同强度的步频阈值。结果如下：在所有跑步机速度下，代谢成本与步速的非线性回归分析得出男性（R（2）= 0.91）和女性（R（2）= 0.79）的最高R（2）值。对于男性，非线性分析得出中等强度和剧烈强度分别为94和125步·min（-1）。对于女性，99和135步迷你分别对应于中度和剧烈的强度。结论：将步速提高到100步·分（-1）可以作为中等强度运动的实用公共卫生建议。
Background: Current recommendations call for adults to be physically active at moderate and/or vigorous intensities. Given the popularity of walking and running, the use of step rates may provide a practical and inexpensive means to evaluate ambulatory intensity. Thus, the purpose of this study was to identify step rate thresholds that correspond to various intensity classifications. Methods: Oxygen consumption was measured at rest and during 10 minute treadmill walking and running trials at 6 standardized speeds (54, 80, 107, 134, 161, and 188 m.min(-1)) in 9 men and 10 women (28.8 +/- 6.8 yrs). Two observers counted the participants' steps at each treadmill speed. Linear and nonlinear regression analyses were used to develop prediction equations to ascertain step rate thresholds at various intensities. Results: Nonlinear regression analysis of the metabolic cost versus step rates across all treadmill speeds yielded the highest R(2) values for men (R(2) = .91) and women (R(2) = .79). For men, the nonlinear analysis yielded 94 and 125 step.min(-1) for moderate and vigorous intensities, respectively. For women, 99 and 135 step-mini corresponded with moderate and vigorous intensities, respectively. Conclusions: Promoting a step rate of 100 step.min(-1) may serve as a practical public health recommendation to exercise at moderate intensity.