Scott Joseph John, Morgan Philip James, Plotnikoff Ronald Cyril, Trost Stewart Graeme, Lubans David Revalds
a Priority Research Centre in Physical Activity and Nutrition, School of Education, University of Newcastle , Callaghan Campus , Australia.
J Sports Sci. 2014;32(2):183-90. doi: 10.1080/02640414.2013.815361. Epub 2013 Sep 9.
The aim of this study was to investigate adolescents' potential reactivity and tampering while wearing pedometers by comparing different monitoring protocols to accelerometer output. The sample included adolescents (N = 123, age range = 14-15 years) from three secondary schools in New South Wales, Australia. Schools were randomised to one of the three pedometer monitoring protocols: (i) daily sealed (DS) pedometer group, (ii) unsealed (US) pedometer group or (iii) weekly sealed (WS) pedometer group. Participants wore pedometers (Yamax Digi-Walker CW700, Yamax Corporation, Kumamoto City, Japan) and accelerometers (Actigraph GT3X+, Pensacola, USA) simultaneously for seven days. Repeated measures analysis of variance was used to examine potential reactivity. Bivariate correlations between step counts and accelerometer output were calculated to explore potential tampering. The correlation between accelerometer output and pedometer steps/day was strongest among participants in the WS group (r = 0.82, P ≤ 0.001), compared to the US (r = 0.63, P ≤ 0.001) and DS (r = 0.16, P = 0.324) groups. The DS (P ≤ 0.001) and US (P = 0.003), but not the WS (P = 0.891), groups showed evidence of reactivity. The results suggest that reactivity and tampering does occur in adolescents and contrary to existing research, pedometer monitoring protocols may influence participant behaviour.
本研究的目的是通过比较不同的监测方案与加速度计输出，来调查青少年佩戴计步器时的潜在反应性和作弊行为。样本包括来自澳大利亚新南威尔士州三所中学的青少年（N = 123，年龄范围 = 14 - 15岁）。学校被随机分配到三种计步器监测方案之一：（i）每日密封（DS）计步器组，（ii）未密封（US）计步器组或（iii）每周密封（WS）计步器组。参与者同时佩戴计步器（Yamax Digi-Walker CW700，日本熊本市Yamax公司）和加速度计（Actigraph GT3X +，美国彭萨科拉）七天。采用重复测量方差分析来检验潜在反应性。计算步数与加速度计输出之间的双变量相关性以探索潜在作弊行为。与US组（r = 0.63，P≤0.001）和DS组（r = 0.16，P = 0.324）相比，WS组参与者的加速度计输出与每日计步器步数之间的相关性最强（r = 0.82，P≤0.001）。DS组（P≤0.001）和US组（P = 0.003），而非WS组（P = 0.891），显示出反应性证据。结果表明，青少年中确实存在反应性和作弊行为，并且与现有研究相反，计步器监测方案可能会影响参与者的行为。
