J Sports Sci Med. 2010 Sep 1;9(3):459-63. eCollection 2010.
The aim of this study was to assess the validity and accuracy of a commercial linear encoder (Musclelab, Ergotest, Norway) to estimate Bench press 1 repetition maximum (1RM) from the force - velocity relationship. Twenty seven physical education students and teachers (5 women and 22 men) with a heterogeneous history of strength training participated in this study. They performed a 1 RM test and a force - velocity test using a Bench press lifting task in a random order. Mean 1 RM was 61.8 ± 15.3 kg (range: 34 to 100 kg), while 1 RM estimated by the Musclelab's software from the force-velocity relationship was 56.4 ± 14.0 kg (range: 33 to 91 kg). Actual and estimated 1 RM were very highly correlated (r = 0.93, p<0.001) but largely different (Bias: 5.4 ± 5.7 kg, p < 0.001, ES = 1.37). The 95% limits of agreement were ±11.2 kg, which represented ±18% of actual 1 RM. It was concluded that 1 RM estimated from the force-velocity relationship was a good measure for monitoring training induced adaptations, but also that it was not accurate enough to prescribe training intensities. Additional studies are required to determine whether accuracy is affected by age, sex or initial level. Key pointsSome commercial devices allow to estimate 1 RM from the force-velocity relationship.These estimations are valid. However, their accuracy is not high enough to be of practical help for training intensity prescription.Day-to-day reliability of force and velocity measured by the linear encoder has been shown to be very high, but the specific reliability of 1 RM estimated from the force-velocity relationship has to be determined before concluding to the usefulness of this approach in the monitoring of training induced adaptations.
这项研究的目的是评估一种商业线性编码器（Musclelab，Ergotest，挪威）通过力量-速度关系来估计卧推 1 次最大重复次数（1RM）的有效性和准确性。27 名体育教育学生和教师（5 名女性和 22 名男性）具有不同的力量训练历史，参加了这项研究。他们以随机顺序进行 1RM 测试和卧推提升任务的力量-速度测试。平均 1RM 为 61.8 ± 15.3kg（范围：34 至 100kg），而 Musclelab 软件从力量-速度关系中估计的 1RM 为 56.4 ± 14.0kg（范围：33 至 91kg）。实际和估计的 1RM 高度相关（r = 0.93，p<0.001），但差异很大（偏差：5.4 ± 5.7kg，p < 0.001，ES = 1.37）。95%的一致性界限为±11.2kg，代表实际 1RM 的±18%。结论是，从力量-速度关系中估计的 1RM 是监测训练引起的适应的良好指标，但也不够准确，无法准确规定训练强度。需要进一步的研究来确定准确性是否受到年龄、性别或初始水平的影响。关键点一些商业设备允许通过力量-速度关系来估计 1RM。这些估计是有效的。然而，它们的准确性不够高，无法在训练强度处方方面提供实际帮助。线性编码器测量的力量和速度的日常可靠性已被证明非常高，但在得出通过力量-速度关系估计 1RM 在监测训练引起的适应方面有用的结论之前，还需要确定该方法的特定可靠性。
