MOVE Research Institute Amsterdam, Faculty of Human Movement Sciences, VU University Amsterdam, The Netherlands.
Int J Sports Physiol Perform. 2013 May;8(3):319-22. doi: 10.1123/ijspp.8.3.319. Epub 2012 Oct 11.
The purpose of this study was to test the assumption that gross efficiency (GE) at sea level (SL) is representative of GE at altitude (AL). It was hypothesized that an increased cost of ventilation and heart rate, combined with a higher respiratory-exchange ratio, at AL might result in a decrease in GE.
Trained men (N = 16) completed 2 maximal incremental tests and 2 GE tests, 1 at SL and 1 at an acute simulated AL of 1500 m (hypobaric chamber). GE was determined during submaximal exercise at 45%, 55%, and 65% of the altitude-specific power output attained at VO2max.
GE determined at the highest submaximal exercise intensity with a mean RER ≤1.0, matched for both conditions, was significantly lower at AL (AL 20.7% ± 1.1% and SL 21.4% ± 0.8%, t15 = 2.9, P < .05).
These results demonstrate that moderate AL resulted in a significantly lower GE during cycling exercise than SL. However, it might be that the lower GE at AL is caused by the lower absolute exercise intensity.
本研究旨在检验一个假设，即在海平面（SL）下的总效率（GE）是否代表在海拔（AL）下的 GE。假设在 AL 下，通气和心率的成本增加，加上更高的呼吸交换比，可能导致 GE 降低。
经过训练的男性（N=16）完成了 2 次最大增量测试和 2 次 GE 测试，1 次在 SL，1 次在急性模拟 AL 为 1500m（减压舱）。GE 是在最大摄氧量时达到的特定海拔功率输出的 45%、55%和 65%的亚最大运动强度下确定的。
在两种条件下均匹配的最高亚最大运动强度下，平均 RER≤1.0 时确定的 GE 在 AL 时明显更低（AL 为 20.7%±1.1%，SL 为 21.4%±0.8%，t15=2.9，P<.05）。
这些结果表明，中度 AL 导致在骑自行车运动时的 GE 明显低于 SL。然而，可能是因为 AL 下的 GE 较低是由绝对运动强度较低引起的。
