Emonson D L, Aminuddin A H, Wight R L, Scroop G C, Gore C J
Department of Physiology, University of Adelaide, Australia.
Eur J Appl Physiol Occup Physiol. 1997;76(1):8-12. doi: 10.1007/s004210050206.
The present study used untrained subjects to examine the effect of acute hypobaric exposure during endurance training on subsequent exercise performance at sea level. Two groups, each of nine subjects, completed 5 weeks of endurance training [cycle ergometer exercise for 45 min, three times per week at a heart rate corresponding to 70% of that achieved at the maximal O2 consumption (VO2max) either at sea level or at high altitude] in a hypobaric chamber, under either normobaric [sea level, SL; 750 mmHg (100 kPa) approximately 90 m] or hypobaric [altitude, ALT; 554 mmHg (73.4 kPa) approximately 2500 m] conditions and the changes in SL VO2max, SL endurance time and peak blood lactate during the endurance test compared. While each group showed increases in both SL VO2max (approximately 12%) and SL endurance time (approximately 71%), there were no significant differences between the groups [SL VO2max, mean (SE)-SL group: pre-training = 42.4 (3.5), post-training = 46.1 (3.5) ml.kg-1.min-1, P < 0.005; ALT group: pre-training = 40.8 (2.6), post-training = 47.2 (3.4) ml.kg-1.min-1, P < 0.01; SL endurance time-SL group: pre-training 7.1 (1.5), post-training 11.8 (2.9) min, P < 0.01; ALT group: pre-training = 7.5 (0.6), post-training = 13.3 (1.4) min, P < 0.001]. Peak blood lactate during the endurance test was not altered by either training regimen. It is concluded that acute exposure of untrained subjects to hypobaric hypoxia during endurance training has no synergistic effect on the degree of improvement in either SL VO2max or endurance time.
本研究使用未经训练的受试者，以检验耐力训练期间急性低压暴露对随后海平面运动表现的影响。两组，每组9名受试者，在低压舱中完成5周的耐力训练[以对应于海平面或高海拔最大摄氧量（VO2max）时所达到心率的70%进行45分钟的自行车测力计运动，每周三次]，分别处于常压[海平面，SL；750 mmHg（100 kPa），约90米]或低压[海拔，ALT；554 mmHg（73.4 kPa），约2500米]条件下，并比较耐力测试期间海平面VO2max、海平面耐力时间和血乳酸峰值的变化。虽然每组的海平面VO2max（约12%）和海平面耐力时间（约71%）均有所增加，但两组之间无显著差异[海平面VO2max，平均值（标准误）-SL组：训练前 = 42.4（3.5），训练后 = 46.1（3.5）ml·kg-1·min-1，P < 0.005；ALT组：训练前 = 40.8（2.6），训练后 = 47.2（3.4）ml·kg-1·min-1，P < 0.01；海平面耐力时间-SL组：训练前7.1（1.5），训练后11.8（2.9）分钟，P < 0.01；ALT组：训练前 = 7.5（0.6），训练后 = 13.3（1.4）分钟，P < 0.001]。耐力测试期间的血乳酸峰值未因任何一种训练方案而改变。结论是，耐力训练期间未经训练的受试者急性暴露于低压低氧环境对海平面VO2max或耐力时间的改善程度没有协同作用。
