Dinyer Taylor K, Byrd M Travis, Vesotsky Ashley N, Succi Pasquale J, Bergstrom Haley C
Int J Sports Physiol Perform. 2019 Nov 1;14(10):1364-1370. doi: 10.1123/ijspp.2018-0981.
To determine if the mathematical model used to derive critical power could be used to identify the critical resistance (CR) for the deadlift; compare predicted and actual repetitions to failure at 50%, 60%, 70%, and 80% 1-repetition maximum (1RM); and compare the CR with the estimated sustainable resistance for 30 repetitions (ESR30).
Twelve subjects completed 1RM testing for the deadlift followed by 4 visits to determine the number of repetitions to failure at 50%, 60%, 70%, and 80% 1RM. The CR was calculated as the slope of the line of the total work completed (repetitions × weight [in kilograms] × distance [in meters]) vs the total distance (in meters) the barbell traveled. The actual and predicted repetitions to failure were determined from the CR model and compared using paired-samples t tests and simple linear regression. The ESR30 was determined from the power-curve analysis and compared with the CR using paired-samples t tests and simple linear regression.
The weight and repetitions completed at CR were 56 (11) kg and 49 (14) repetitions. The actual repetitions to failure were less than predicted at 50% 1RM (P < .001) and 80% 1RM (P < .001) and greater at 60% 1RM (P = .004), but there was no difference at 70% 1RM (P = .084). The ESR30 (75 [14] kg) was greater (P < .001) than the CR.
The total work-vs-distance relationship can be used to identify the CR for the deadlift, which reflected a sustainable resistance that may be useful in the design of resistance-based exercise programs.
确定用于推导临界功率的数学模型是否可用于识别硬拉的临界阻力（CR）；比较预测的和实际的在1次重复最大值（1RM）的50%、60%、70%和80%时的重复次数至疲劳；并将CR与30次重复的估计可持续阻力（ESR30）进行比较。
12名受试者完成了硬拉的1RM测试，随后进行4次访视，以确定在1RM的50%、60%、70%和80%时的重复次数至疲劳。CR计算为完成的总功（重复次数×重量[千克]×距离[米]）与杠铃移动的总距离（米）的直线斜率。根据CR模型确定实际的和预测的重复次数至疲劳，并使用配对样本t检验和简单线性回归进行比较。通过功率曲线分析确定ESR30，并使用配对样本t检验和简单线性回归将其与CR进行比较。
在CR时完成的重量和重复次数分别为56（11）千克和49（14）次重复。实际的重复次数至疲劳在1RM的50%（P <.001）和80%（P <.001）时少于预测值，在1RM的60%时多于预测值（P =.004），但在1RM的70%时无差异（P =.084）。ESR30（75 [14]千克）大于CR（P <.001）。
总功与距离的关系可用于识别硬拉的CR，这反映了一种可持续阻力，可能对基于阻力的运动计划设计有用。
