Dept of Kinesiology and Health Promotion, University of Kentucky, Lexington, KY, USA.
J Phys Act Health. 2011 Jan;8(1):45-51. doi: 10.1123/jpah.8.1.45.
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.
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.
Nonlinear regression analysis of the metabolic cost versus step rates across all treadmill speeds yielded the highest R² values for men (R² = .91) and women (R² = .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·min⁻¹ corresponded with moderate and vigorous intensities, respectively.
Promoting a step rate of 100 step·min⁻¹ may serve as a practical public health recommendation to exercise at moderate intensity.
目前的建议要求成年人以适度和/或剧烈的强度进行身体活动。鉴于步行和跑步的普及，步速的使用可能提供了一种实用且经济的方法来评估步行强度。因此，本研究的目的是确定与各种强度分类相对应的步速阈值。
在 9 名男性和 10 名女性（28.8±6.8 岁）中，在 6 个标准化速度（54、80、107、134、161 和 188 m·min⁻¹）的 10 分钟跑步机步行和跑步试验中，在休息和运动期间测量耗氧量。两名观察者在每个跑步机速度下计算参与者的步数。线性和非线性回归分析用于开发预测方程，以确定各种强度下的步速阈值。
对所有跑步机速度的代谢成本与步速进行非线性回归分析，得出了男性（R²=.91）和女性（R²=.79）的最高 R²值。对于男性，非线性分析得出中等强度和剧烈强度的步速分别为 94 和 125 步·min⁻¹。对于女性，中等强度和剧烈强度对应的步速分别为 99 和 135 步·min⁻¹。
促进 100 步·min⁻¹的步速可能是一个实用的公共卫生建议，以达到适度强度的运动。
