Ferretti G, Hauser H, di Prampero P E
Department of Physiology, University of Geneva Medical School, Switzerland.
Int J Sports Med. 1990 Feb;11 Suppl 1:S31-4. doi: 10.1055/s-2007-1024851.
The maximal muscular power (both instantaneous, w, and average, w-.) and the cross-sectional area of the left thigh (CSA) were measured on six subjects before (B) and after (A) prolonged exposure to high altitude (above 5000 m asl). w and w were determined during a standing high jump off both feet on a force platform, and CSA by computed tomography. It was observed that: (1) in B, body weight (BW) = 74.1 +/- 5.8 kg, w = 3330 +/- 460 W (44.8 +/- 3.4 W.kg-1). w-. = 1795 +/- 395 W (24.6 +/- 4.3 W.kg-1), and CSA = 184.5 +/- 23.1 cm2; 2) in A, BW = 70.4 +/- 6.6 kg, w = 3005 +/- 472 W (42.5 +/- 3.6 W.kg-1), w = 1531 +/- 267 W (21.9 +/- 3.1 W.kg-1), and CSA = 163.5 +/- 23.1 cm2. Thus, w and w-. were decreased both in absolute terms (-9.8% and -14.7%, respectively) and per unit BW (-5.1% and -11.0%). However, because of the concomitant decrease in CSA, when expressed per unit cross-sectional area of the muscle, w (9.04 +/- 0.71 and 9.20 +/- 0.72 W +/- cm2) and w (4.87 +/- 0.81 and 4.70 +/- 0.67 W/cm2) were unchanged. The intrinsic capacity of the muscle to generate explosive power is therefore preserved in A. It is concluded that the decrease in w and w after high-altitude exposure depends only on a net loss of muscle mass.
在六名受试者长时间暴露于高海拔地区（海拔5000米以上）之前（B）和之后（A），测量了其最大肌肉力量（包括瞬时力量，单位为瓦特（W），以及平均力量，单位为瓦特（W-））和左大腿的横截面积（CSA）。W和W-是通过在测力平台上双脚站立跳高时测定的，而CSA是通过计算机断层扫描测定的。观察到：（1）在B状态下，体重（BW）=74.1±5.8千克，W=3330±460瓦特（44.8±3.4瓦特·千克-1），W-=1795±395瓦特（24.6±4.3瓦特·千克-1），CSA=184.5±23.1平方厘米；（2）在A状态下，BW=70.4±6.6千克，W=3005±472瓦特（42.5±3.6瓦特·千克-1），W=1531±267瓦特（21.9±3.1瓦特·千克-1），CSA=163.5±23.1平方厘米。因此，W和W-无论在绝对值上（分别下降了9.8%和14.7%）还是每单位体重上（分别下降了5.1%和11.0%）都有所降低。然而，由于CSA同时下降，当以每单位肌肉横截面积表示时，W（9.04±0.71和9.20±0.72瓦特/平方厘米）和W-（4.87±0.81和4.70±0.67瓦特/平方厘米）没有变化。因此，在A状态下肌肉产生爆发力的内在能力得以保留。得出的结论是，高海拔暴露后W和W-的下降仅取决于肌肉质量的净损失。
