吸气阻力对中度常压缺氧下运动表现及感知的影响
The Effect of Inspiratory Resistance on Exercise Performance and Perception in Moderate Normobaric Hypoxia.
作者信息
Seo Yongsuk, Vaughan Jeremiah, Quinn Tyler D, Followay Brittany, Roberge Raymond, Glickman Ellen L, Kim Jung-Hyun
机构信息
1 National Personal Protective Technology Laboratory, National Institute for Occupational Safety and Health , Centers for Disease Control and Prevention, Pittsburgh, Pennsylvania.
2 Department of Exercise Physiology, Kent State University , Kent, Ohio.
出版信息
High Alt Med Biol. 2017 Dec;18(4):417-424. doi: 10.1089/ham.2017.0103. Epub 2017 Nov 7.
UNLABELLED
Seo, Yongsuk, Jeremiah Vaughan, Tyler D. Quinn, Brittany Followay, Raymond Roberge, Ellen L. Glickman, and Jung-Hyun Kim. The effect of inspiratory resistance on exercise performance and perception in moderate normobaric hypoxia. High Alt Med Biol. 18:417-424, 2017.
PURPOSE
Respirators are simple and efficient in protecting workers against toxic airborne substances; however, their use may limit the physical performance of workers. The purpose of this study was to determine the effect of inspiratory resistance on physical performance and breathing perception in normobaric hypoxia.
METHOD
Nine healthy men wore a tight-fitting respiratory mask outfitted with one of four different inspiratory resistors (R) (0, 1.5, 4.5, 7.5 cm HO/L/Sec) while exercising at normobaric hypoxia (17% O) at submaximal exercise workloads of 50, 100, and 150 W on a cycle ergometer for 10 minutes each, followed by a maximal oxygen uptake (VOmax) test to exhaustion.
RESULTS
Maximal power output at R7.5 was significantly lower than R0 (p = 0.016) and R1.5 (p = 0.035). Respiration rate was significantly reduced at R4.5 (p = 0.011) and R7.5 (p ≤ 0.001) compared with R0. Minute ventilation was significantly decreased in R7.5 compared with R0 (p = 0.003), R1.5 (p = 0.010), and R4.5 (p = 0.016), whereas VO was not significantly changed. Breathing comfort (BC) and breathing effort (BE) were significantly impaired in R7.5 (BC: p = 0.025, BE: p = 0.001) and R4.5 (BC: p = 0.007, BE: p = 0.001) compared with R0, but rating of perceived exertion (RPE) remained unchanged.
CONCLUSIONS
Added inspiratory resistance limited maximal power output and increased perceptions of BC and BE in normobaric hypoxia. However, low-to-moderate inspiratory resistance did not have a deleterious effect on VO or RPE at submaximal or maximal exercise. Perceptual and physiological characteristics of respirators of varying inspiratory resistances should be considered by manufacturers and end users during design and respirator selection processes.
未标注
徐英硕、杰里迈亚·沃恩、泰勒·D·奎因、布列塔尼·福洛韦、雷蒙德·罗伯热、埃伦·L·利克曼、郑铉金。中等常压低氧环境下吸气阻力对运动表现和感知的影响。《高海拔医学与生物学》。2017年第18卷：417 - 424页。
目的
呼吸器在保护工人免受空气中有毒物质侵害方面简单且有效；然而，其使用可能会限制工人的身体表现。本研究的目的是确定常压低氧环境下吸气阻力对身体表现和呼吸感知的影响。
方法
九名健康男性在常压低氧（氧含量17%）环境下，于功率自行车上以50瓦、100瓦和150瓦的次最大运动负荷进行锻炼，每次锻炼10分钟，期间佩戴配备四种不同吸气阻力（R）（0、1.5、4.5、7.5厘米水柱/升/秒）之一的紧身呼吸面罩，随后进行最大摄氧量（VO₂max）测试直至力竭。
结果
R7.5时的最大功率输出显著低于R0（p = 0.016）和R1.5（p = 0.035）。与R0相比，R4.5（p = 0.011）和R7.5（p≤0.001）时呼吸频率显著降低。与R0（p = 0.003）、R1.5（p = 0.010）和R4.5（p = 0.016）相比，R7.5时每分通气量显著下降，而VO₂无显著变化。与R0相比，R7.5（呼吸舒适度：p = 0.025，呼吸努力程度：p = 0.001）和R4.5（呼吸舒适度：p = 0.007，呼吸努力程度：p = 0.001）时呼吸舒适度（BC）和呼吸努力程度（BE）显著受损，但自觉用力程度（RPE）保持不变。
结论
在常压低氧环境下，增加吸气阻力会限制最大功率输出，并增强对BC和BE的感知。然而，低至中等吸气阻力在次最大或最大运动时对VO₂或RPE没有有害影响。制造商和终端用户在设计和选择呼吸器过程中应考虑不同吸气阻力呼吸器的感知和生理特征。
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