Medical Decision Support, Institute of Engineering in Health of Lille, University of Lille 2 , France ; Laboratory of Human Movement Studies, Faculty of Sport Sciences and Physical Education, University of Lille 2 , France.
Medical Decision Support, Institute of Engineering in Health of Lille, University of Lille 2 , France.
J Sports Sci Med. 2005 Dec 1;4(4):534-42. eCollection 2005 Dec.
This study was designed to investigate the relationship between Actigraph counts and running speed; and to describe differences due to accelerometer position on the body and due to exercise modality. Eleven physical education students (age, 25.1 ± 3.7 years; height, 1.73 ± 0.10 m; body mass, 70.8 ± 10.8 kg) completed two exhaustive exercise tests (continuous and intermittent), with MTI accelerometers mounted both at the hip and ankle. Exercise consisted of running for 3-min at incremental speeds until volitional exhaustion. During both exercise tests, the relationship between the ActiGraph outputs worn at the hip and speed was linear in the range 1.1 - 3.3 m·s(-1) (r(2) = 0.94 and 0.95, p < 0.01 for continuous and intermittent exercise respectively). A coefficient of determination of r(2) = 0.97 (p < 0.01) was found with ankle wearing from walking, jogging and running at high speeds. There was a body placement effect at all absolute speeds (p < 0.01); but no exercise effect on accelerometer counts and no interaction between placement and exercise (p> 0.05). The ActiGraph seems to be a reliable tool for estimating a wide range of activity or exercise intensities. An ActiGraph worn at the ankle may be more appropriate to reflect normal human movement. Key PointsActigraph counts are not influenced by the type of activity.The levelling off of Actigraph output depends mainly on its location on the body, and does not reflect a lack of sensivity at higher speeds.The ActiGraph can be an alternative tool to estimate activity intensity in various conditions.
这项研究旨在探究 Actigraph 计数与跑步速度之间的关系，并描述因身体位置和运动方式不同而产生的差异。11 名体育专业学生（年龄 25.1 ± 3.7 岁；身高 1.73 ± 0.10 m；体重 70.8 ± 10.8 kg）完成了两次耗竭性运动测试（连续和间歇），在髋部和脚踝上安装了 MTI 加速度计。运动包括以递增速度跑步 3 分钟，直到达到自愿力竭。在这两种运动测试中，佩戴在髋部的 ActiGraph 输出与速度之间的关系在 1.1-3.3 m·s(-1)的范围内呈线性（连续和间歇运动的 r(2)分别为 0.94 和 0.95，p<0.01）。从行走、慢跑和高速跑步时，脚踝佩戴的 r(2)的确定系数为 0.97（p<0.01）。在所有绝对速度下都存在身体位置效应（p<0.01）；但加速度计计数不受运动影响，且位置和运动之间没有相互作用（p>0.05）。ActiGraph 似乎是一种可靠的工具，可以估计广泛的活动或运动强度。佩戴在脚踝上的 ActiGraph 可能更适合反映人类的正常运动。关键点Actigraph 计数不受活动类型的影响。ActiGraph 输出的平稳取决于其在身体上的位置，而不是反映在较高速度下缺乏敏感性。ActiGraph 可以成为在各种条件下估计活动强度的替代工具。
