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Background <p>The aim of the research was to examine the sensitivity of load-velocity (L-V) relationship parameters (<i>L</i><sub>0</sub>, <i>v</i><sub>0</sub>, and A<sub>line</sub> (area under the L–V line; A<sub>line</sub> = <i>L</i><sub>0</sub><b>×</b><i>v</i><sub>0</sub><b>/</b> 2)) in detecting fatigue after different fatigue protocols as well as their correlation with changes in 1-repetition maximum (1RM).</p> Methods <p>After a familiarization and preliminary testing session which was used for 1RM smith-machine squat (SMS) determination and performing a set of repetition to failure with 70%1RM load, 28 resistance-trained men randomly performed three fatigue protocols. All fatigue protocols were carried out between two incremental loading tests, conducted at the beginning (pre-session) and end (post-session) of the training session. The characteristics of the fatigue protocols were as follows: (i) control protocol: no training, (ii) moderate-fatigue protocol: 5 sets of the SMS exercise at 70%1RM performing half the maximum possible number of repetitions, and (iii) high-fatigue protocol: 5 sets of the SMS exercise performed to failure against the 70%1RM.</p> Results <p>Post-session declines in 1RM (<i>p</i> &lt; 0.001), <i>L</i><sub>0</sub> (<i>p</i> = 0.001) and A<sub>line</sub> (<i>p</i> &lt; 0.001) were the greatest after the high fatigue protocol, followed by the moderate fatigue protocol and finally the control protocol. Changes in <i>v</i>₀ did not differentiate between the fatigue protocols (<i>p</i> = 0.325). The post-session percentage change in 1RM was significantly correlated with the percentage change in A<sub>line</sub> (<i>r</i> = 0.832) and <i>L</i><sub>0</sub> (<i>r</i> = 0.764), but not with the percentage change in <i>v</i><sub>0</sub> (<i>r</i>= -0.012).</p> Conclusions <p>These results suggest that L-V relationship variables offer a highly sensitive and practical solution for fatigue monitoring. Trial registration: ClinicalTrials.gov, NCT07307963 (First posted: 27/11/2025; retrospectively registered).</p>

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Sensitivity of the load-velocity relationship variables to discriminate the level of fatigue induced by multiple sets of the smith-machine squat exercise

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  • 发表日期：

    2026年2月27日

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  • Deniz Senturk,
  • Aliasker Kumak,
  • Danica Janicijevic

摘要

Background

The aim of the research was to examine the sensitivity of load-velocity (L-V) relationship parameters (L0, v0, and Aline (area under the L–V line; Aline = L0×v0/ 2)) in detecting fatigue after different fatigue protocols as well as their correlation with changes in 1-repetition maximum (1RM).

Methods

After a familiarization and preliminary testing session which was used for 1RM smith-machine squat (SMS) determination and performing a set of repetition to failure with 70%1RM load, 28 resistance-trained men randomly performed three fatigue protocols. All fatigue protocols were carried out between two incremental loading tests, conducted at the beginning (pre-session) and end (post-session) of the training session. The characteristics of the fatigue protocols were as follows: (i) control protocol: no training, (ii) moderate-fatigue protocol: 5 sets of the SMS exercise at 70%1RM performing half the maximum possible number of repetitions, and (iii) high-fatigue protocol: 5 sets of the SMS exercise performed to failure against the 70%1RM.

Results

Post-session declines in 1RM (p < 0.001), L0 (p = 0.001) and Aline (p < 0.001) were the greatest after the high fatigue protocol, followed by the moderate fatigue protocol and finally the control protocol. Changes in v₀ did not differentiate between the fatigue protocols (p = 0.325). The post-session percentage change in 1RM was significantly correlated with the percentage change in Aline (r = 0.832) and L0 (r = 0.764), but not with the percentage change in v0 (r= -0.012).

Conclusions

These results suggest that L-V relationship variables offer a highly sensitive and practical solution for fatigue monitoring. Trial registration: ClinicalTrials.gov, NCT07307963 (First posted: 27/11/2025; retrospectively registered).