We investigated the acute biophysical responses of changing the mandibular position during a rowing incremental protocol. A World-class 37-year-old male rower performed two 7 × 3 min ergometer rowing trials, once with no intraoral splint (control) and the other with a mandibular forward repositioning splint (splint condition). Ventilatory, kinematics and body electromyography were evaluated and compared between trials (paired samples t-test, p ≤ 0.05). Under the splint condition, oxygen uptake was lower, particularly at higher exercise intensities (67.3 ± 2.3 vs. 70.9 ± 1.5 mL·kg−1·min−1), and ventilation increased during specific rowing protocol steps (1st–4th and 6th). Wearing the splint condition led to changes in rowing technique, including a slower rowing frequency ([18–30] vs. [19–32] cycles·min−1) and a longer propulsive movement ([1.58–1.52] vs. [1.56–1.50] m) than the control condition. The splint condition also had a faster propulsive phase and a prolonged recovery period than the control condition. The splint reduced peak and mean upper body muscle activation, contrasting with an increase in lower body muscle activity, and generated an energetic benefit by reducing exercise cost and increasing rowing economy compared to the control condition. Changing the mandibular position benefited a World-class rower, supporting the potential of wearing an intraoral splint in high-level sports, particularly in rowing.
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机译：我们研究了在划船增量方案中改变下颌位置的急性生物物理反应。一名世界级的 37 岁男性赛艇运动员进行了两次 7 × 3 分钟测力计划船试验，一次没有口内夹板（对照），另一次使用下颌骨前移复位夹板（夹板状况）。在试验之间评估和比较通气、运动学和体肌电图 （配对样本 t 检验，p ≤ 0.05）。在夹板条件下，摄氧量较低，尤其是在较高的运动强度下（67.3 ± 2.3 vs. 70.9 ± 1.5 mL·kg-1·min-1），并且在特定的划船方案步骤（第 1-4 和第 6 步）期间通气增加。佩戴夹板条件导致划船技术发生变化，包括比对照条件更慢的划船频率（[18-30] vs. [19-32] 周期·min-1）和更长的推进运动（[1.58-1.52] vs. [1.56-1.50] m）。夹板条件也比对照条件具有更快的推进阶段和更长的恢复期。夹板减少了峰值和平均上半身肌肉激活，与下半身肌肉活动的增加形成鲜明对比，与对照组相比，夹板通过降低运动成本和增加划船经济性产生了能量效益。改变下颌位置使世界级的赛艇运动员受益，支持在高水平运动中佩戴口内夹板的潜力，尤其是在划船中。
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