Bonnefoy M, Kostka T, Arsac L M, Berthouze S E, Lacour J R
Service de Médecine Gériatrique, Centre Hospitalier Lyon-Sud, Pierre-Bénite, Lyon, France.
Eur J Appl Physiol Occup Physiol. 1998;77(1-2):182-8. doi: 10.1007/s004210050318.
The relationship of maximal anaerobic power (Pmax) of the quadriceps muscle and corresponding optimal shortening velocity (vopt) with age, habitual physical activity (PA) and maximal oxygen consumption (VO2max) were assessed in 37 healthy older [71.1 (SD 3.8) years] men and compared to those of 16 young [22.7 (SD 3.4) years] men. The PA was evaluated using a questionnaire. The Pmax and vopt were measured on a friction loaded non-isokinetic cycle ergometer. The Pmax was expressed relative to body mass - Pmax x kg(-1), and relative to the mass of the two quadriceps muscles - Pmax x kgquad(-1). The decline of Pmax x kg(-1) from youth to advanced age (8.3% per decade) was greater than the decrease in quadriceps muscle mass (3.8% per decade), in Pmax x kgquad(-1) (5.9% per decade) and in vopt (4.3% per decade). In the older men, a negative relationship of Pmax x kg(-1) (r = -0.33) and Pmax x kgquad(-1) (r = -0.44) with age was found. Ergometer measurements were not correlated with PA activity indices or VO2max, while VO2max was positively associated with PA. In a multiple stepwise regression analysis age was the only variable that contributed significantly to Pmax x kg(-1) and Pmax x kgquad(-1) variances. Our findings indicated that in these healthy elderly men, unlike the fall in VO2max, habitual PA did not attenuate the decline in Pmax of the quadriceps muscle with age. This finding was different from a previously described relationship in older women and would suggest sex differences in determining Pmax in healthy older subjects.
对37名健康老年男性[71.1（标准差3.8）岁]的股四头肌最大无氧功率（Pmax）及相应的最佳缩短速度（vopt）与年龄、习惯性身体活动（PA）和最大耗氧量（VO2max）之间的关系进行了评估，并与16名年轻男性[22.7（标准差3.4）岁]进行了比较。使用问卷评估PA。在摩擦加载的非等速自行车测力计上测量Pmax和vopt。Pmax以相对于体重表示——Pmax×kg（-1），以及相对于两侧股四头肌的质量表示——Pmax×kgquad（-1）。从青年到高龄，Pmax×kg（-1）的下降（每十年8.3%）大于股四头肌质量的下降（每十年3.8%）、Pmax×kgquad（-1）的下降（每十年5.9%）和vopt的下降（每十年4.3%）。在老年男性中，发现Pmax×kg（-1）（r = -0.33）和Pmax×kgquad（-1）（r = -0.44）与年龄呈负相关。测力计测量结果与PA活动指数或VO2max无关，而VO2max与PA呈正相关。在多元逐步回归分析中，年龄是唯一对Pmax×kg（-1）和Pmax×kgquad（-1）方差有显著贡献的变量。我们的研究结果表明，在这些健康老年男性中，与VO2max下降不同，习惯性PA并未减弱股四头肌Pmax随年龄的下降。这一发现与先前描述的老年女性的关系不同，提示在健康老年受试者中确定Pmax存在性别差异。
