van Etten L M, Westerterp K R, Verstappen T J
Department of Human Biology, University of Limburg, Maastricht, The Netherlands.
Int J Sports Med. 1996 Oct;17(7):497-503. doi: 10.1055/s-2007-972885.
To quantify day-to-day variability in energy expenditure (EE) during weight-training, 10 male subjects completed 6 training sessions that consisted of a warming-up and cooling-down phase (10 min; arm cranking or cycling) and a computer-paced weight-training phase using standard weights (42 min; 10 exercises, 3 x 15 repetitions, work to rest ratio = 1:1). The first 2 sessions were used to accommodate. During sessions 3-6 (labelled session A, B, C and D) cardiorespiratory response was continuously measured. Gas-exchange was converted to EE using the Weir formula. In the last two sessions training weights were raised by +/- 50% and the initial warming-up and cooling-down exercise being arm-cranking was replaced by cycling. Mean EE was calculated for last five minutes of the warming-up (WU5) and cooling-down (CD5) and the complete weight-training phase (WT). Mean EE during WT for session A to D was 20.0 +/- 2.7, 19.1 +/- 2.5, 22.2 +/- 2.2 and 21.9 +/- 2.4 kj.min-1, respectively. Daily variation was tested by comparing test-retest phases (A vs B and C vs D). Intra-individual variability in EE during respectively the lower (session A vs B) and higher (session C vs D) weight-training intensity was expressed as: absolute test-retest difference (0.9 +/- 0.5 and 0.7 +/- 0.6 kj.min-1), difference relative to the mean of the test-retest measurements (2.3 +/- 1.4 and 1.6 +/- 1.4%) and as the mean coefficient of variation (3.3 and 2.2%). There were no differences in variability between both WT-intensities nor exercise modes, irrespective of the way variability was expressed. In conclusion, intra-individual variability in EE during weight-training does not differ from variability during arm cranking or cycling.
为了量化重量训练期间能量消耗（EE）的每日变化，10名男性受试者完成了6次训练课程，包括热身和冷却阶段（10分钟；手臂曲柄运动或骑自行车）以及使用标准重量的计算机控制重量训练阶段（42分钟；10项练习，3组，每组15次重复，工作与休息比=1:1）。前2次训练用于适应。在第3 - 6次训练（标记为A、B、C和D组）期间，持续测量心肺反应。使用韦尔公式将气体交换转换为EE。在最后两次训练中，训练重量提高了+/- 50%，并且最初的热身和冷却运动从手臂曲柄运动改为骑自行车。计算热身（WU5）和冷却（CD5）最后五分钟以及整个重量训练阶段（WT）的平均EE。A至D组WT期间的平均EE分别为20.0 +/- 2.7、19.1 +/- 2.5、22.2 +/- 2.2和21.9 +/- 2.4千焦·分钟⁻¹。通过比较重测阶段（A与B以及C与D）来测试每日变化。在较低（A组与B组）和较高（C组与D组）重量训练强度下，EE的个体内变异性分别表示为：绝对重测差异（0.9 +/- 0.5和0.7 +/- 0.6千焦·分钟⁻¹）、相对于重测测量平均值的差异（2.3 +/- 1.4和1.6 +/- 1.4%）以及平均变异系数（3.3和2.2%）。无论变异性如何表示，两种WT强度和运动模式之间的变异性均无差异。总之，重量训练期间EE的个体内变异性与手臂曲柄运动或骑自行车期间的变异性没有差异。
