What intensity of physical activity do previously sedentary middle-aged women select? Evidence of a coherent pattern from physiological, perceptual, and affective markers
What intensity of physical activity do previously sedentary middle-aged women select? Evidence of a coherent pattern from physiological, perceptual, and affective markers
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DOI：
10.1016/j.ypmed.2004.07.006
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发表时间：
2005-04-01
影响因子：
5.1
通讯作者：
Ekkekakis, P
中科院分区：
文献类型：
--
作者：
Lind, E;Joens-Matre, RR;Ekkekakis, P
背景资料。研究发现，体育活动的强度与坚持程度成反比，因此导致了体育运动不足的问题。尽管大多数体力活动都是无人监督的，因此参与者自行选择强度，但对他们选择的强度水平知之甚少。我们假设参与者平均会选择接近从有氧代谢到无氧代谢转换水平的强度。23名久坐的中年女性参加了(A)递增的跑步机测试，以确定她们的最大有氧能力和气体交换换气阈值，这是有氧-无氧转换的一个指标，以及(B)20分钟的跑步机运动，在此期间她们可以选择速度。平均而言，但个体间有相当大的变异性，女性选择的强度在跑步机速度、心率、摄氧量和感觉到的运动量方面与她们的气体交换呼吸阈值对应的强度没有区别。此外，情感效价保持正向稳定。平均而言，以前久坐不动的中年女性选择的强度被认为是生理上有效的，并报告说它不会使人双脚僵硬或不舒服。未来的研究应该研究个体间变异性的来源以及运动强度超过个人喜好水平的后果。(C)2004年癌症预防研究所和爱思唯尔公司。保留所有权利。
Background. The intensity of physical activity has been found to be inversely related to adherence, thus contributing to the problem of physical inactivity. Although most physical activity is unsupervised and participants, therefore, self-select the intensity, very little is known about the level of intensity that they select. We hypothesized that participants would select, on average, an intensity proximal to the level of transition from aerobic to anaerobic metabolism.Methods. Twenty-three middle-aged, formerly sedentary women participated in (a) an incremental treadmill test to determine their maximal aerobic capacity and gas exchange ventilatory threshold, an index of the aerobic-anaerobic transition, and (b) a 20-min bout of treadmill exercise during which they were allowed to select the speed.Results. On average, but with considerable interindividual variability, the women selected an intensity that, in terms of treadmill speed, heart rate, oxygen uptake, and perceived exertion was no different from the intensity corresponding to their gas exchange ventilatory threshold. Moreover, affective valence remained positive and stable.Conclusions. On average, middle-aged, formerly sedentary women selected an intensity that is considered physiologically effective and reported that it did not feet hard or unpleasant. Future research should examine the sources of interindividual variability and the consequences of exercising at an intensity that exceeds one's preferred level. (C) 2004 The Institute For Cancer Prevention and Elsevier Inc. All rights reserved.