Cooke S R, Petersen S R, Quinney H A
Faculty of Physical Education and Recreation, University of Alberta, Edmonton, Canada.
Eur J Appl Physiol Occup Physiol. 1997;75(6):512-9. doi: 10.1007/s004210050197.
Phosphorus magnetic resonance spectroscopy (31P-MRS) was used to investigate the influence of maximal aerobic power (VO2max) on the recovery of human calf muscle from high-intensity exercise. The (VO2max) of 21 males was measured during treadmill exercise and subjects were assigned to either a low-aerobic-power (LAP) group (n = 10) or a high-aerobic-power (HAP) group (n = 11). Mean (SE) VO2max of the groups were 46.6 (1.1) and 64.4 (1.4) ml.kg-1.min-1, respectively. A calf ergometry work capacity test was used to assign the same relative exercise intensity to each subject for the MRS protocol. At least 48 h later, subjects performed the rest (4 min), exercise (2 min) and recovery (10 min) protocol in a 1.5 T MRS scanner. The relative concentration of phosphocreatine (PCr) was measured throughout the protocol and intracellular pH (pHi) was determined from the chemical shift between inorganic phosphate (Pi) and PCr. End-exercise PCr levels were 27 (3.4) and 25 (3.5)% of resting levels for LAP and HAP respectively. Mean resting pHi was 7.07 for both groups, and following exercise it fell to 6.45 (0.04) for HAP and 6.38 (0.04) for LAP. Analysis of data using non-linear regression models showed no differences in the rate of either PCr or pHi recovery. The results suggest that VO2max is a poor predictor of metabolic recovery rate from high-intensity exercise. Differences in recovery rate observed between individuals with similar VO2max imply that other factors influence recovery.
磷磁共振波谱法（31P-MRS）被用于研究最大有氧功率（VO2max）对人体小腿肌肉从高强度运动中恢复的影响。在跑步机运动期间测量了21名男性的VO2max，并将受试者分为低有氧功率（LAP）组（n = 10）或高有氧功率（HAP）组（n = 11）。两组的平均（SE）VO2max分别为46.6（1.1）和64.4（1.4）ml·kg-1·min-1。使用小腿测力计工作能力测试为MRS方案给每个受试者分配相同的相对运动强度。至少48小时后，受试者在1.5T MRS扫描仪中执行休息（4分钟）、运动（2分钟）和恢复（10分钟）方案。在整个方案中测量磷酸肌酸（PCr）的相对浓度，并根据无机磷酸盐（Pi）和PCr之间的化学位移确定细胞内pH值（pHi）。运动结束时，LAP组和HAP组的PCr水平分别为静息水平的27（3.4）%和25（3.5）%。两组的平均静息pHi均为7.07，运动后，HAP组降至6.45（0.04），LAP组降至6.38（0.04）。使用非线性回归模型对数据进行分析表明，PCr或pHi的恢复率没有差异。结果表明，VO2max不能很好地预测高强度运动后的代谢恢复率。在具有相似VO2max的个体之间观察到的恢复率差异意味着其他因素会影响恢复。
