Laboratory of Physiology and Biochemistry of Exercise, Faculdade de Motricidade Humana, Universidade de Lisboa, Oeiras, Portugal.
CIPER, Faculdade de Motricidade Humana, Universidade de Lisboa, Lisbon, Portugal.
Eur J Appl Physiol. 2024 Dec;124(12):3741-3754. doi: 10.1007/s00421-024-05569-1. Epub 2024 Aug 13.
To investigate the impact of voluntary hypoventilation at low lung volumes (VHL) during upper body repeated sprints (RS) on performance, metabolic markers and muscle oxygenation in Brazilian Jiu-Jitsu (BJJ) athletes.
Eighteen male well-trained athletes performed two randomized RS sessions, one with normal breathing (RSN) and another with VHL (RS-VHL), on an arm cycle ergometer, consisting of two sets of eight all-out 6-s sprints performed every 30 s. Peak (PPO), mean power output (MPO), and RS percentage decrement score were calculated. Arterial oxygen saturation (SpO), heart rate (HR), gas exchange, and muscle oxygenation of the long head of the triceps brachii were continuously recorded. Blood lactate concentration ([La]) was measured at the end of each set. Bench press throw peak power (BP) was recorded before and after the RS protocol.
Although SpO was not different between conditions, PPO and MPO were significantly lower in RS-VHL. , HR, [La], and RER were lower in RS-VHL, and VO was higher in RS-VLH than in RSN. Muscle oxygenation was not different between conditions nor was its pattern of change across the RS protocol influenced by condition. [La] was lower in RS-VHL than in RSN after both sets.
Performance was significantly lower in RS-VHL, even though SPO was not consistent with hypoxemia. However, the fatigue index was not significantly affected by VHL, nor was the neuromuscular upper body power after the RS-VHL protocol. Additionally, [La] was lower, and oxygen consumption was higher in RS-VHL, suggesting a higher aerobic contribution in this condition.
研究在上半身重复冲刺（RS）期间进行低肺容量（VHL）自愿性低通气对巴西柔术（BJJ）运动员的表现、代谢标志物和肌肉氧合的影响。
18 名训练有素的男性运动员在臂式循环测力计上进行了两次随机 RS 测试，一次是正常呼吸（RSN），另一次是 VHL（RS-VHL），共包括两组，每组 8 次全力 6 秒冲刺，每 30 秒进行一次。计算峰值（PPO）、平均功率输出（MPO）和 RS 百分比降低评分。连续记录动脉血氧饱和度（SpO）、心率（HR）、气体交换和肱三头肌长头的肌肉氧合。在每组结束时测量血乳酸浓度（[La]）。在 RS 方案前后记录卧推投掷峰值功率（BP）。
尽管 SpO 在两种情况下没有差异，但 PPO 和 MPO 在 RS-VHL 中明显较低。HR、[La]、RER 在 RS-VHL 中较低，而 VO 在 RS-VLH 中较高，与 RSN 相比。肌肉氧合在两种情况下没有差异，条件也没有影响 RS 方案中肌肉氧合的变化模式。两组后，[La]在 RS-VHL 中均低于 RSN。
尽管 SpO 与低氧血症不一致，但 RS-VHL 中的表现明显较低。然而，VHL 对疲劳指数没有显著影响，RS-VHL 方案后也没有对上半身神经肌肉力量产生影响。此外，[La]在 RS-VHL 中较低，耗氧量较高，表明该条件下有氧贡献更高。
