School of Kinesiology and Recreation, Illinois State University, Normal, IL, USA.
Department of Exercise Science and Health Promotion, Florida Atlantic University, Boca Raton, FL, USA.
Percept Mot Skills. 2023 Jun;130(3):1239-1254. doi: 10.1177/00315125231169868. Epub 2023 Apr 10.
We assessed the accuracy of intraset repetitions in reserve (RIR) predictions on single-joint machine-based movements of trained and untrained men and women. Participants were 27 men ( age = 22, = 0.6 years; weight = 90.8, = 4.0 kg; height = 182.3, = 1.4 cm; training experience = 66, = 9 months) and 31 women ( age = 20, = 0.4 years; weight = 67.8, = 2.3 kg; height = 167.6, = 1.1 cm; training experience = 22, = 4 months). In one session, participants performed a five-repetition maximum (5RM) test on biceps curl, triceps pushdown, and seated row exercises; we then estimated one repetition maximum (1RM). Participants then performed four sets of each exercise, in a randomized order, to the point of momentary muscular failure at 72.5% of 1RM. During each set, participants indicated when they first perceived 5RIR and then predicted RIR on every repetition thereafter until failure. The difference between actual repetitions performed and predicted repetitions at each intraset prediction was determined to be the RIR difference (RIRDIFF). A 3-way repeated measures ANCOVA found that a 3-way interaction was not statistically significant ( = 0.435) and no covariates of sex ( = 0.917), training experience ( = 0.462) nor experience rating RIR significantly affected RIRDIFF ( = 0.462-0.917). There were significant main effects for the proximity to failure of the prediction and the set number ( < 0.01) but not for exercise ( = 0.688). Thus, intraset RIR predictions were more accurate when closer to failure and in later sets, but sex, training experience, and experience rating RIR did not significantly influence RIR prediction accuracy on machine-based single-joint exercises.
我们评估了训练有素和未经训练的男性和女性在基于机器的单关节运动中储备内重复（RIR）预测的准确性。参与者包括 27 名男性（年龄=22，=0.6 岁；体重=90.8，=4.0kg；身高=182.3，=1.4cm；训练经验=66，=9 个月）和 31 名女性（年龄=20，=0.4 岁；体重=67.8，=2.3kg；身高=167.6，=1.1cm；训练经验=22，=4 个月）。在一次会议中，参与者进行了五次重复最大（5RM）测试，分别是二头肌卷曲、三头肌下压和坐姿划船练习；然后我们估计了一次重复最大（1RM）。然后，参与者以随机顺序进行每组四项练习，直到以 72.5%的 1RM 达到瞬间肌肉衰竭。在每组练习中，参与者在第一次感觉到 5RIR 时进行指示，然后在随后的每次重复中预测 RIR，直到失败。在每个预测的储备内重复中，实际重复次数与预测重复次数之间的差异确定为 RIR 差异（RIRDIFF）。三因素重复测量方差分析发现，三因素交互作用不具有统计学意义（=0.435），性别（=0.917）、训练经验（=0.462）或 RIR 经验评分均无显著影响 RIRDIFF（=0.462-0.917）。预测的临近失败和组号有显著的主要影响（<0.01），但运动（=0.688）没有显著影响。因此，在更接近失败和在后期的组中，储备内 RIR 预测更准确，但性别、训练经验和 RIR 经验评分对基于机器的单关节运动的 RIR 预测准确性没有显著影响。
