Intermittent Normobaric Hypoxic Exposures at Rest: Effects on Performance in Normoxia and Hypoxia
Intermittent Normobaric Hypoxic Exposures at Rest: Effects on Performance in Normoxia and Hypoxia
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DOI：
10.3357/asem.3332.2012
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发表时间：
2012-10-01
影响因子：
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通讯作者：
Kounalakis, Stylianos N.
中科院分区：
文献类型：
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作者：
Mekjavic, Igor B.;Debevec, Tadej;Kounalakis, Stylianos N.
MEKJAVIC IB，DEBEVEC T，AMON M，KERAMIDAS ME，KOUNALAKIS SN.间歇性常压低氧暴露：对常氧和低氧表现的影响。Aviat Space Environ Med 2012 83：942-50.简介：据推测，短期（类似于1小时）暴露于间歇性常压缺氧休息可以提高随后的运动表现。因此，本研究调查了每日休息间歇性低氧暴露（IHE）的影响，峰值有氧能力和性能正常和低氧条件下。研究方法：18名受试者被平均分配到对照组（CON）或IHE组，并进行4周的中等强度自行车运动训练（1小时）。d（-1），5 d . wk（-1））。IHE组在运动训练前额外进行IHE（60 min）。IHE包括在呼吸低氧气体混合物（5分钟; FlO 2 = 0.12-0.09）和室内空气（3分钟; FlO 2 = 0.21）之间交替的7个循环。在训练前（PRE）、训练中（MID）、训练后（POST）和训练后10天（AFTER），对常氧和低氧峰值有氧能力（（V）over dotO（2 peak））和耐力表现进行评价。结果如下：在两组中，常氧（V）与dotO（2 peak）测试相比观察到类似的改善[IHE：Delta（POST-PRE）= +10%; CON：Delta（POST-PRE）= +14%]，缺氧条件无变化。两组仅在常氧恒定功率测试中增加了性能时间[IHE：Delta（POST-PRE）= +108%; CON：Delta（POST-PRE）= +114%]，而只有IHE组在AFTER测试中保持了这种改善。在POST和AFTER测试中，与CON组相比，IHE组的每分钟通气量水平更高。结论：根据本研究的结果，IHE似乎并不有利于常氧和低氧性能的提高。
MEKJAVIC IB, DEBEVEC T, AMON M, KERAMIDAS ME, KOUNALAKIS SN. Intermittent normobaric hypoxic exposures at rest: effects on performance in normoxia and hypoxia. Aviat Space Environ Med 2012 83:942-50. Introduction: It has been speculated that short (similar to 1-h) exposures to intermittent normobaric hypoxia at rest can enhance subsequent exercise performance. Thus, the present study investigated the effect of daily resting intermittent hypoxic exposures (IHE) on peak aerobic capacity and performance under both normoxic and hypoxic conditions. Methods: Eighteen subjects were equally assigned to either a control (CON) or IHE group and performed a 4-wk moderate intensity cycling exercise training (1 h . d(-1), 5 d . wk(-1)). The IHE group additionally performed IHE (60 min) prior to exercise training. IHE consisted of seven cycles alternating between breathing a hypoxic gas mixture (5 min; FlO2 = 0.12-0.09) and room air (3 min; FlO2, = 0.21). Normoxic and hypoxic peak aerobic capacity ((V) over dotO(2peak)) and endurance performance were evaluated before (PRE), during (MID), upon completion (POST), and 10 d after (AFTER) the training period. Results: Similar improvements were observed in normoxic (V) over dotO(2peak) tests in both groups [IHE: Delta(POST-PRE) = +10%; CON: Delta(POST-PRE) = +14%], with no changes in the hypoxic condition. Both groups increased performance time in the normoxic constant power test only [IHE: Delta(POST-PRE) = +108%; CON: Delta(POST-PRE) = +114%], whereas only the IHE group retained this improvement in the AFTER test. Higher levels of minute ventilation were noted in the IHE compared to the CON group at the POST and AFTER tests. Conclusion: Based on the results of this study, the IHE does not seem to be beneficial for normoxic and hypoxic performance enhancement.