School of Health, Medical and Applied Sciences, Central Queensland University, Queensland, Australia.
Mackay Cutters Rugby League Club, Mackay, Queensland, Australia.
J Strength Cond Res. 2021 Feb 1;35(2):340-346. doi: 10.1519/JSC.0000000000003871.
Elsworthy, N, Callaghan, DE, Scanlan, AT, Kertesz, AHM, Kean, CO, Dascombe, BJ, and Guy, JH. Validity and reliability of using load-velocity relationship profiles to establish back squat 1 m·s-1 load. J Strength Cond Res 35(2): 340-346, 2021-Although measuring movement velocity during resistance exercise is being increasingly used to monitor player readiness for competition in team sports, the validity and reliability of using set target velocities has not been examined. This study examined test-retest reliability of the load-velocity relationship during the back squat to predict loads corresponding to a mean velocity of 1 m·s-1 (V1Load), test-retest reliability of mean concentric velocity at V1Load, and criterion validity of mean concentric velocity at V1Load. Twenty-seven resistance-trained male rugby league players completed 2 testing sessions on separate days to establish individualized back squat load-velocity relationship profiles (30, 40, 60, and 80% estimated 1 repetition maximum). Velocity during the back squat was assessed at each load and V1Load derived using individualized linear regression equations. A subset of subjects (n = 18) also performed the back squat at predicted V1Load to examine the test-retest reliability and compare the mean concentric velocity with the predicted target of 1 m·s-1. The mean concentric velocity was consistent across all loads during load-velocity relationship testing (p > 0.05, intraclass correlation coefficient [ICC] ≥0.75, coefficient of variation [CV] ≤5.7%, effect size [ES] ≤0.27), and for predicting V1Load (p = 0.11, ICC = 0.95, CV = 3.9%, ES = 0.11). The mean concentric velocity at V1Load was reliable (ICC = 0.77; CV = 2.6%; ES = 0.39) and not significantly different (p = 0.21) to the target velocity, supporting criterion validity. Individualized load-velocity profiles for the back squat can accurately predict V1Load, and subsequent use of V1Load to assess back squat velocity is valid and reliable. Using V1Load to assess changes in back squat velocity may have application in measuring changes in strength and power or readiness to train.
埃尔斯沃西、N、卡拉汉、DE、斯坎兰、AT、克特斯、AHM、基恩、CO、达斯科姆、BJ 和盖伊、JH。使用负荷-速度关系曲线确定深蹲 1 m·s-1 负荷的有效性和可靠性。J 力量与条件研究 35(2):340-346,2021 年-虽然在团队运动中越来越多地使用测量阻力运动期间的运动速度来监测运动员的比赛准备情况，但尚未检查使用设定目标速度的有效性和可靠性。本研究检验了深蹲过程中负荷-速度关系的测试-再测试可靠性，以预测与平均速度 1 m·s-1(V1Load)相对应的负荷，V1Load 时的平均向心速度的测试-再测试可靠性，以及 V1Load 时的平均向心速度的标准效度。27 名受过阻力训练的男性橄榄球联盟运动员在两天的不同时间完成了 2 次测试，以建立个性化的深蹲负荷-速度关系曲线(30%、40%、60%和 80%估计的 1 次重复最大值)。在每个负荷下评估深蹲时的速度，并使用个性化的线性回归方程得出 V1Load。一小部分受试者(n=18)还根据预测的 V1Load 进行了深蹲，以检验测试-再测试的可靠性，并将平均向心速度与 1 m·s-1 的预测目标进行比较。在负荷-速度关系测试过程中，所有负荷下的平均向心速度都是一致的(p>0.05，组内相关系数[ICC]≥0.75，变异系数[CV]≤5.7%，效应大小[ES]≤0.27)，并且可以预测 V1Load(p=0.11，ICC=0.95，CV=3.9%，ES=0.11)。V1Load 时的平均向心速度是可靠的(ICC=0.77；CV=2.6%；ES=0.39)，与目标速度没有显著差异(p=0.21)，支持标准效度。深蹲的个性化负荷-速度曲线可以准确预测 V1Load，随后使用 V1Load 评估深蹲速度是有效和可靠的。使用 V1Load 评估深蹲速度的变化可能在衡量力量和力量的变化或训练准备方面具有应用价值。
