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Purpose <p>This study aimed to compare the acute neuromuscular and perceptual effects of two types of random exercise sessions: one with a randomly assigned but fixed exercise intensity, and the other with a self-selected exercise intensity.</p> Method <p>Twenty-seven young healthy participants performed 4 sessions of 24&#xa0;min of typical exercise sessions in parkour (lower limb) and street workout (upper limb). They did two conditions: Chosen (CHO) in which they were given autonomy on the session, and imposed (IMP) in which they followed a computer-generated random program. Maximal Voluntary Isometric Contractions (MViC) and electromyographic (EMG) activity of flexor digitorum superficialis and vastus medialis were measured before and after. Activity levels (actimetry) were measured during, and subjective feelings were assessed after the sessions. Statistical significance was set at a level of 0.05.</p> Results <p>Similar strength decreases (– 10 ± 9%) in knee extension were observed in both conditions, as a result of the sessions. A decrease of 8 ± 25% was observed in EMG activity after IMP only in the upper limbs. There were differences in actimetry between conditions. Mental demand was rated 44% higher after CHO.</p> Conclusion <p>Results suggest that implementing randomness in exercise intensities by means of a computerized generation of exercises order primarily affects effort distribution and perception, and induces similar neuromuscular fatigue as an exercise session with chosen exercises order. This exercise approach may help coaches better regulate the amplitude and distribution of exercise intensity over time, while self-chosen exercise could foster a greater mental demand in athletes.</p>

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Imposed versus self-chosen organization during exercise: comparison of two modalities involving randomness, on mental and physical responses

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Sylvain Dhote,
  • Philippe Gimenez,
  • Angel Parriaux,
  • Melina Behava,
  • Sidney Grosprêtre

摘要

Purpose

This study aimed to compare the acute neuromuscular and perceptual effects of two types of random exercise sessions: one with a randomly assigned but fixed exercise intensity, and the other with a self-selected exercise intensity.

Method

Twenty-seven young healthy participants performed 4 sessions of 24 min of typical exercise sessions in parkour (lower limb) and street workout (upper limb). They did two conditions: Chosen (CHO) in which they were given autonomy on the session, and imposed (IMP) in which they followed a computer-generated random program. Maximal Voluntary Isometric Contractions (MViC) and electromyographic (EMG) activity of flexor digitorum superficialis and vastus medialis were measured before and after. Activity levels (actimetry) were measured during, and subjective feelings were assessed after the sessions. Statistical significance was set at a level of 0.05.

Results

Similar strength decreases (– 10 ± 9%) in knee extension were observed in both conditions, as a result of the sessions. A decrease of 8 ± 25% was observed in EMG activity after IMP only in the upper limbs. There were differences in actimetry between conditions. Mental demand was rated 44% higher after CHO.

Conclusion

Results suggest that implementing randomness in exercise intensities by means of a computerized generation of exercises order primarily affects effort distribution and perception, and induces similar neuromuscular fatigue as an exercise session with chosen exercises order. This exercise approach may help coaches better regulate the amplitude and distribution of exercise intensity over time, while self-chosen exercise could foster a greater mental demand in athletes.