Herzberg Max, Rosendahl Jenny, Mader Lena, Anders Christoph
Division of Motor Research, Pathophysiology and Biomechanics, Experimental Trauma Surgery, Clinic for Trauma, Hand and Reconstructive Surgery, Jena University Hospital, Friedrich Schiller University Jena, Jena, Germany.
Institute for Psychosocial Medicine, Psychotherapy and Psychooncology, Jena University Hospital, Friedrich Schiller University Jena, Jena, Germany.
Front Psychol. 2025 Aug 27;16:1466750. doi: 10.3389/fpsyg.2025.1466750. eCollection 2025.
While psychological factors are known to influence physical performance, responses to unexpectedly extended endurance tasks remain unclear.
In a crossover-randomized study, 37 participants performed an isometric endurance task twice, with a 14-day interval, compensating for 50% of upper body weight for 10 min. Muscular fatigue was measured via EMG of the back muscles, and perceived exertion (RPE; Borg scale 6-20) was recorded every minute (Real). In the experimental condition (Fake), RPE was recorded every 50 s without participants' awareness. After the tenth query, participants were told a technical error occurred and were asked to continue for two additional minutes with two extra RPE queries. Participants were grouped by RPE and Fatigue Index (FI) into "good-end" and "bad-end" groups. FI and RPE were compared between Real and Fake conditions.
RPE-based grouping showed no significant FI differences. FI-based grouping revealed significantly higher RPE in the "good-end" group during the Fake condition (+0.9 at 540/550 s; +1.0 at 600 s). No significant differences were found in the "bad-end" group.
Extending a task beyond its expected endpoint increases perceived exertion, which may lead to task termination despite unchanged muscular fatigue.
虽然已知心理因素会影响身体表现，但对意外延长的耐力任务的反应仍不清楚。
在一项交叉随机研究中，37名参与者进行了两次等长耐力任务，间隔14天，以补偿上半身重量的50%，持续10分钟。通过背部肌肉的肌电图测量肌肉疲劳，并每分钟记录一次主观用力程度（RPE；Borg量表6 - 20）（实际情况）。在实验条件下（虚假情况），在参与者不知情的情况下每50秒记录一次RPE。在第十次询问后，告知参与者发生了技术错误，并要求他们再继续两分钟，增加两次RPE询问。根据RPE和疲劳指数（FI）将参与者分为“良好结局”和“不良结局”组。比较实际情况和虚假情况之间的FI和RPE。
基于RPE的分组显示FI无显著差异。基于FI的分组显示，在虚假情况下，“良好结局”组的RPE显著更高（在540/550秒时增加0.9；在600秒时增加1.0）。“不良结局”组未发现显著差异。
将任务延长至预期终点之外会增加主观用力程度，这可能导致尽管肌肉疲劳未变但任务终止。
