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Rationale <p>Previous studies indicate that countermovement jump (CMJ) parameters may reflect neuromuscular fatigue following exhaustive exercise. However, changes in CMJ performance in response to non-muscle damaging exercise, and its relation to prolonged low-frequency force depression (PLFFD) is yet unknown.</p> Purpose <p>This study aimed to evaluate the relationship between&#xa0;PLFFD and CMJ test parameters following exhaustive cycling exercise to task failure.</p> Methods <p>A sample of 11 recreationally active adults completed an incremental cycling protocol to task failure. CMJ performance, low-frequency (10&#xa0;Hz) force, and maximal voluntary contraction (MVC) force output were assessed at baseline (pre-exercise), immediately after task failure (0&#xa0;min), and at 8&#xa0;min, 15&#xa0;min, 60&#xa0;min, 24&#xa0;h, and 48&#xa0;h post-task failure. PLFFD was assessed as the ratio of 10&#xa0;Hz to MVC force.</p> Results <p>Compared to baseline, PLFFD was larger from 0&#xa0;min (7.4%) to 60-min (6.7%, <i>p</i> &lt; 0.002). In contrast, no substantial changes in CMJ parameters were observed, except for a reduced concentric impulse (ConImp) lasting 8&#xa0;min post-exercise.</p> Conclusion <p>The results show that CMJ parameters remain unchanged following non-eccentrically loaded exhaustive exercise, while PLFFD is significantly higher for up to 60&#xa0;min post-exercise. This raises questions about the utility of CMJ as a fatigue assessment tool in athletic populations. This suggests that CMJ testing may not effectively detect the presence of PLFFD following non-muscle damaging exercise and future research should explore alternative measures for monitoring neuromuscular fatigue in training contexts.</p>

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Countermovement jump performance after metabolically, but not mechanically demanding exercise: limited sensitivity to prolonged low-frequency force depression

  • 期刊论文

  • 发表日期：

    2025年7月6日

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  • Owen R. Lindsay,
  • Jared R. Fletcher

摘要

Rationale

Previous studies indicate that countermovement jump (CMJ) parameters may reflect neuromuscular fatigue following exhaustive exercise. However, changes in CMJ performance in response to non-muscle damaging exercise, and its relation to prolonged low-frequency force depression (PLFFD) is yet unknown.

Purpose

This study aimed to evaluate the relationship between PLFFD and CMJ test parameters following exhaustive cycling exercise to task failure.

Methods

A sample of 11 recreationally active adults completed an incremental cycling protocol to task failure. CMJ performance, low-frequency (10 Hz) force, and maximal voluntary contraction (MVC) force output were assessed at baseline (pre-exercise), immediately after task failure (0 min), and at 8 min, 15 min, 60 min, 24 h, and 48 h post-task failure. PLFFD was assessed as the ratio of 10 Hz to MVC force.

Results

Compared to baseline, PLFFD was larger from 0 min (7.4%) to 60-min (6.7%, p < 0.002). In contrast, no substantial changes in CMJ parameters were observed, except for a reduced concentric impulse (ConImp) lasting 8 min post-exercise.

Conclusion

The results show that CMJ parameters remain unchanged following non-eccentrically loaded exhaustive exercise, while PLFFD is significantly higher for up to 60 min post-exercise. This raises questions about the utility of CMJ as a fatigue assessment tool in athletic populations. This suggests that CMJ testing may not effectively detect the presence of PLFFD following non-muscle damaging exercise and future research should explore alternative measures for monitoring neuromuscular fatigue in training contexts.