Performance, Metabolic, and Neuromuscular Consequences of Repeated Wingates in Hypoxia and Normoxia: A Pilot Study
Performance, Metabolic, and Neuromuscular Consequences of Repeated Wingates in Hypoxia and Normoxia: A Pilot Study
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缺氧和常氧条件下重复温盖特的表现、代谢和神经肌肉后果：一项初步研究
DOI：
10.1123/ijspp.2020-0654
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发表时间：
2021
影响因子：
3.3
通讯作者：
Girard Olivier
中科院分区：
文献类型：
--
作者：
Takei Naoya;Soo Jacky;Hatta Hideo;Girard Olivier
背景：与正常缺氧相比，在缺氧条件下，不完全恢复（≤30秒）的重复短时间（5-10秒）冲刺（bbb10次努力）可能导致大幅度的性能下降，并伴有更大的代谢紊乱和神经肌肉疲劳程度。然而，低氧对重复长时间（30秒）“全力”训练并接近完全恢复（4.5分钟）的表现以及由此产生的代谢和神经肌肉调节的影响尚不清楚。目的：目的是比较缺氧和常氧状态下重复Wingates患者的急性表现、代谢和神经肌肉反应。方法：在单独的访问中，6名男性参与者在低氧（吸入氧的比例：0.145）或常氧下进行4 × 30秒Wingate努力，4.5分钟恢复。对每次运动的反应（肌肉和动脉氧合趋势、心率和血乳酸浓度）和膝关节伸肌神经肌肉功能的完整性进行评估。结果：平均功率输出（P= 0.80）和峰值功率输出（P= 0.92）；88)，血乳酸浓度(P=。72)，知觉反应在不同条件下无差异（p < 0.05）。低氧组与常氧组相比，动脉氧饱和度显著降低，心率显著升高（P< 0.001）。无论在何种条件下，最大自主收缩力和周围疲劳指数（峰值收缩力和低频和高频的双峰）在不同的努力下都有所下降（allPs < 0.001）。结论：尽管动脉低氧血症和心血管恳求加剧，但在4次30秒的重复温盖特运动中缺氧暴露对运动表现和伴随的代谢和神经肌肉调节没有影响。
Background: Compared with normoxia, repeated short (5–10 s) sprints (>10 efforts) with incomplete recovery (≤30 s) in hypoxia likely cause substantial performance reduction accompanied by larger metabolic disturbances and magnitude of neuromuscular fatigue. However, the effects of hypoxia on performance of repeated long (30 s) “all-out” efforts with near complete recovery (4.5 min) and resulting metabolic and neuromuscular adjustments remain unclear.Purpose: The intention was to compare acute performance, metabolic, and neuromuscular responses across repeated Wingates between hypoxia and normoxia.Methods: On separate visits, 6 male participants performed 4 × 30-second Wingate efforts with 4.5-minute recovery in either hypoxia (fraction of inspired oxygen: 0.145) or normoxia. Responses to exercise (muscle and arterial oxygenation trends, heart rate, and blood lactate concentration) and the integrity of neuromuscular function in the knee extensors were assessed for each exercise bout.Results: Mean (P= .80) and peak (P= .92) power outputs, muscle oxygenation (P= .88), blood lactate concentration (P= .72), and perceptual responses (allPs > .05) were not different between conditions. Arterial oxygen saturation was significantly lower, and heart rate higher, in hypoxia versus normoxia (P< .001). Maximal voluntary contraction force and peripheral fatigue indices (peak twitch force and doublets at low and high frequencies) decreased across efforts (allPs < .001) irrespective of conditions (allPs > .05).Conclusion: Despite heightened arterial hypoxemia and cardiovascular solicitation, hypoxic exposure during 4 repeated 30-second Wingate efforts had no effect on performance and accompanying metabolic and neuromuscular adjustments.