血流限制下杠铃卧推不同低负荷时储备重复次数的效度和重测信度

Validity and Test-Retest Reliability of Repetitions-In-Reserve Across Different Low-Loads in the Barbell Bench Press With Blood Flow Restriction.

作者信息

Grant William M, Goods Paul S R, Wall Bradley A, Davids Charlie J, Narang Benjamin J, Debevec Tadej, Scott Brendan R

机构信息

PHysical Activity, Sport and Exercise (PHASE) Research Group, School of Allied Health (Exercise Science), Murdoch University, Murdoch, Australia.

Center for Healthy Ageing, Murdoch University, Murdoch, Australia.

出版信息

J Strength Cond Res. 2025 Jul 9. doi: 10.1519/JSC.0000000000005190.

DOI:10.1519/JSC.0000000000005190

PMID:40644671

Abstract

Grant, WM, Goods, PSR, Wall, BA, Davids, CJ, Narang, BJ, Debevec, T, and Scott, BR. Validity and test-retest reliability of repetitions-in-reserve across different low-loads in the barbell bench press with blood flow restriction. J Strength Cond Res XX(X): 000-000, 2025-Repetitions-in-reserve (RIR) allows the standardization of effort between individuals during resistance training. This study investigated the validity and reliability of predicting RIR during low-load resistance training with blood flow restriction (BFR). Twenty subjects were assessed for bench press one-repetition maximum (1RM), before 4 experimental trials (20, 30, 30, 40% 1RM) comprising 4 sets (30, 15, 15, 15 repetitions; 30 seconds rest) with continuous BFR at 60% arterial occlusion pressure. After 15 repetitions in the final set, subjects estimated RIR before continuing the set to failure. Differences between estimated RIR and actual repetitions to failure were calculated (RIRerror). Test-retest reliability of RIRerror was determined from repeated 30% 1RM trials using intraclass correlation coefficients (ICC) and coefficients of variation (CV). Differences and associations were assessed by repeated measures ANOVA and correlational analyses. The fewest fourth set repetitions were performed at 40% 1RM (median [interquartile range] = 8 [5-16] repetitions), followed by 30% 1RM (30 [19-37]) and 20% 1RM (90 [53-114]). RIRerror was significantly higher with 20% 1RM (52 [23-76]) than 30% 1RM (9 [2-15]; p < 0.001) but was not analyzed at 40% 1RM (because 14/20 subjects completed ≤15 repetitions). Repetitions-in-reserve predictions were moderately reliable (ICC: 0.980, CV: 13.6%), but with wide limits of agreement (-7 to 7 repetitions). Number of fourth set repetitions was almost perfectly correlated with RIRerror (R2 = 0.90-0.94). Repetitions-in-reserve should not replace 1RM training prescriptions for low-load BFR. Results suggest that 30% 1RM is an appropriate load to begin with for trained individuals using a 75-repetition BFR scheme.

摘要

格兰特、WM、古兹、PSR、沃尔、BA、戴维兹、CJ、纳朗、BJ、德贝韦茨、T和斯科特、BR。血流限制下杠铃卧推不同低负荷时剩余重复次数的有效性和重测可靠性。《力量与体能研究杂志》XX(X):000 - 000，2025年 - 剩余重复次数（RIR）可使阻力训练期间个体间的努力标准化。本研究调查了血流限制（BFR）下低负荷阻力训练期间预测RIR的有效性和可靠性。对20名受试者进行卧推一次最大重复量（1RM）评估，然后进行4次实验性试验（20%、30%、30%、40% 1RM），每组包括4组（30次、15次、15次、15次重复；休息30秒），在60%动脉闭塞压力下持续进行BFR。在最后一组完成15次重复后，受试者在继续进行该组至力竭前估计RIR。计算估计的RIR与实际至力竭重复次数之间的差异（RIR误差）。通过组内相关系数（ICC）和变异系数（CV），从重复的30% 1RM试验中确定RIR误差的重测可靠性。通过重复测量方差分析和相关分析评估差异和相关性。在40% 1RM时进行的第四组重复次数最少（中位数[四分位间距]=8[5 - 16]次重复），其次是30% 1RM（30[19 - 37]次）和20% 1RM（90[53 - 114]次）。20% 1RM时的RIR误差（52[23 - 76]次）显著高于30% 1RM时（9[2 - 15]次；p<0.001），但未对40% 1RM时进行分析（因为14/20名受试者完成的重复次数≤15次）。RIR预测具有中等可靠性（ICC：0.980，CV：13.6%），但一致性界限较宽（-7至7次重复）。第四组重复次数与RIR误差几乎完全相关（R² = 0.90 - 0.94）。对于低负荷BFR，RIR不应取代1RM训练处方。结果表明，对于采用75次重复BFR方案的训练有素的个体，30% 1RM是合适的起始负荷。