Martínez-Rubio Carlos, Baena-Raya Andrés, Quidel-Catrilelbún Mauricio Elías Leandro, Rodríguez-Pérez Manuel A, Pérez-Castilla Alejandro
Department of Education, Faculty of Education Sciences, University of Almería, Almería, Spain.
SPORT Research Group (CTS-1024), CERNEP Research Center, University of Almería, Almería, Spain.
Sports Health. 2025 Feb 17:19417381251315119. doi: 10.1177/19417381251315119.
Maximum repetitions to failure (RTF) and repetitions in reserve (RIR) can be estimated through fastest mean velocity (MV) and mean velocity (MV), respectively. However, the impact of inter-repetition intervals (IRI) on these relationships in free-weight back squat and bench press exercises is unclear.
The IRI would affect RTF-MV and RIR-MV relationships, with a higher goodness-of-fit using self-selected IRI (SSIRI) compared with 0 seconds (IRI0) and 3 seconds (IRI3).
Crossover study design.
Level 3.
Eighteen male participants completed 1 session per IRI configuration, consisting of 3 single sets of RTF (65%-75%-85% of the 1-repetition maximum) during the free-weight back squat and bench press exercises.
Individualized RTF-MV and RIR-MV relationships were stronger than generalized (median = 0.98 vs 0.65 and 0.84 vs 0.40, respectively). The goodness-of-fit of the relationships was stronger for SSIRI than for IRI0 during back squat ( < .01) and comparable between IRIs during bench press ( ≥ .28). During back squat, MV values were higher for IRI0 than for IRI3 and SSIRI (eighth-fifteenth repetitions; ≤ .07), whereas during the bench press, they were higher for IRI0 than for IRI3 (eleventh-fifteenth repetitions; ≥ .28). Overall, MV values associated with each RIR were higher for IRI0 than for SSIRI (10 out of 18 comparisons) during back squat, and for IRI0 than for IRI3 and SSIRI (16 and 14 out of 18 comparisons) during bench press.
These results highlight the importance of standardizing the IRI during set-to-failure to establish RTF-MV and RIR-MV relationships, with SSIRI recommended as a more accurate and effective procedure.
This information may provide practitioners with a valuable tool to objectively quantify the level of effort being exerted during resistance training sets by measuring movement velocity in free-weight exercises.
至疲劳的最大重复次数（RTF）和储备重复次数（RIR）可分别通过最快平均速度（MV）和平均速度（MV）来估算。然而，在自由重量深蹲和卧推练习中，组间休息间隔（IRI）对这些关系的影响尚不清楚。
IRI会影响RTF-MV和RIR-MV关系，与0秒（IRI0）和3秒（IRI3）相比，自选IRI（SSIRI）的拟合优度更高。
交叉研究设计。
3级。
18名男性参与者针对每种IRI配置完成1次训练，包括在自由重量深蹲和卧推练习中进行3组单次的RTF训练（1次最大重复量的65%-75%-85%）。
个体化的RTF-MV和RIR-MV关系比通用关系更强（中位数分别为0.98对0.65和0.84对0.40）。在深蹲时，SSIRI的关系拟合优度比IRI0更强（P<0.01），在卧推时，不同IRI之间的拟合优度相当（P≥0.28）。在深蹲时，IRI0的MV值高于IRI3和SSIRI（第8 - 15次重复；P≤0.07），而在卧推时，IRI0的MV值高于IRI3（第11 - 15次重复；P≥0.28）。总体而言，在深蹲时，与每个RIR相关的MV值，IRI0高于SSIRI（18次比较中有10次），在卧推时，IRI0高于IRI3和SSIRI（18次比较中分别有16次和14次）。
这些结果凸显了在进行至疲劳训练时标准化IRI以建立RTF-MV和RIR-MV关系的重要性，推荐SSIRI作为一种更准确有效的方法。
该信息可为从业者提供一个有价值的工具，通过测量自由重量练习中的运动速度来客观量化抗阻训练组中所付出的努力程度。
