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Purpose <p>This study assesses the finite work capacity (<i>W′</i>) above critical power (CP) when work rate is reduced during severe intensity exercise and whether reducing work rate immediately prior to task failure allows continued work above CP.</p> Methods <p>14 cyclists performed three experimental trials. Two consisted of exercising at a fixed work rate (WR) that depleted 70% of <i>W′</i> in 90&#xa0;s and 180&#xa0;s respectively, after which work rate was reduced to CP + 20&#xa0;W and continued until task failure. The third consisted of exercising at a fixed work rate to achieve task failure in 5&#xa0;min (P<sub>5</sub>) when work rate was reduced, and exercise continued until task failure. Work rate was reduced a further two times and continued until task failure. Predicted (WORK<sub>PRED</sub>) and actual work above CP (WORK<sub>90</sub>, WORK<sub>180</sub>, WORK<sub>P5</sub>) and predicted (TTE<sub>PRED</sub>) and actual time to task failure (TTE<sub>90</sub>, TTE<sub>180</sub>, TTE<sub>P5</sub>) for each of the trials were compared.</p> Results <p>Compared to WORK<sub>PRED</sub>, total work above CP was greater (<i>P</i> &lt; 0.05) in all three trials [WORK<sub>90</sub> (+ 5.4 ± 0.7&#xa0;kJ); WORK<sub>180</sub> (+ 4.3 ± 1.3&#xa0;kJ); WORK<sub>P5</sub> (+ 2.7 ± 0.4&#xa0;kJ)]. Compared to the respective predicted time, time to task failure was greater (<i>P</i> &lt; 0.05) in all three trials [TTE<sub>90</sub> (+ 256 ± 38&#xa0;s); TTE<sub>180</sub> (+ 240 ± 55s); TTE<sub>P5</sub> (+ 109 ± 12s)].</p> Conclusion <p><i>W′</i> is not a fixed parameter. When <i>W′</i> was partially depleted work above CP continued more than predicted. Moreover, when <i>W′</i> is theoretically 0&#xa0;kJ, work can continue above CP, if work rate is reduced.</p>

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The effect of reducing work rate on total work done and time to task failure during severe intensity exercise

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月12日

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  • Alexander J. Welburn,
  • Stephen J. Bailey,
  • Richard A. Ferguson

摘要

Purpose

This study assesses the finite work capacity (W′) above critical power (CP) when work rate is reduced during severe intensity exercise and whether reducing work rate immediately prior to task failure allows continued work above CP.

Methods

14 cyclists performed three experimental trials. Two consisted of exercising at a fixed work rate (WR) that depleted 70% of W′ in 90 s and 180 s respectively, after which work rate was reduced to CP + 20 W and continued until task failure. The third consisted of exercising at a fixed work rate to achieve task failure in 5 min (P5) when work rate was reduced, and exercise continued until task failure. Work rate was reduced a further two times and continued until task failure. Predicted (WORKPRED) and actual work above CP (WORK90, WORK180, WORKP5) and predicted (TTEPRED) and actual time to task failure (TTE90, TTE180, TTEP5) for each of the trials were compared.

Results

Compared to WORKPRED, total work above CP was greater (P < 0.05) in all three trials [WORK90 (+ 5.4 ± 0.7 kJ); WORK180 (+ 4.3 ± 1.3 kJ); WORKP5 (+ 2.7 ± 0.4 kJ)]. Compared to the respective predicted time, time to task failure was greater (P < 0.05) in all three trials [TTE90 (+ 256 ± 38 s); TTE180 (+ 240 ± 55s); TTEP5 (+ 109 ± 12s)].

Conclusion

W′ is not a fixed parameter. When W′ was partially depleted work above CP continued more than predicted. Moreover, when W′ is theoretically 0 kJ, work can continue above CP, if work rate is reduced.