Effects of age and physical activity status on the speed-aerobic demand relationship of walking.
Effects of age and physical activity status on the speed-aerobic demand relationship of walking.
复制标题
年龄和体力活动状态对步行速度-有氧需求关系的影响。
DOI：
10.1152/jappl.1992.73.1.200
复制
发表时间：
1992
期刊：
影响因子：
--
通讯作者：
Larish,DD
中科院分区：
文献类型：
--
作者：
Martin,PE;Rothstein,DE;Larish,DD
与年轻人相比，老年人倾向于表现出较低的首选步行速度和较高的有氧运动需求。有人认为，久坐不动的生活方式会导致肌肉骨骼功能下降，这反过来又会导致老年人和久坐不动的成年人的运动经济性较差。本研究的目的是量化老年人（大于65岁）和年轻人步行过程中的速度-有氧需求关系，并确定体力活动状态是否影响这种关系。对30名年轻人和30名老年人的有氧运动需求进行了测量，这些人代表了久坐和体力活动组，受试者以0.67至2.01 m/s的7种速度进行跑步机行走。所有四个年龄/体力活动组均显示U形速度-有氧需求曲线，最小单位步行距离（ml.kg-1. km-1）的总耗氧量为1.34 m/s。观察到对步行有氧需求的统计学显著年龄效应，老年受试者的平均有氧需求比年轻受试者高8%。这种与年龄相关的影响与有氧需求最小化时的速度变化无关，也与老年人的首选步行速度落在速度-有氧需求曲线的不太经济的部分无关。相反，据推测，老年人肌肉力量产生能力的下降可能需要招募额外的运动单位，也许需要额外比例的不太经济的快速收缩肌纤维来产生必要的力量。体力活动状况对步行有氧需求没有显著影响。（250字处删节）
Older adults tend to show lower preferred walking speeds and higher aerobic demands per distance walked than young adults. It has been suggested that a more sedentary life-style contributes to diminished musculoskeletal functioning, which in turn contributes to poorer economy of motion in the aged and sedentary adults. The purpose of this study was to quantify the speed-aerobic demand relationship during walking for old (greater than 65 yr of age) and young adults and to determine whether physical activity status affects this relationship. Aerobic demands for 30 young and 30 old individuals representing sedentary and physically active groups were measured as the subjects performed treadmill walking at seven speeds ranging from 0.67 to 2.01 m/s. All four age/physical activity groups displayed U-shaped speed-aerobic demand curves with minimum gross oxygen consumption per unit distance walked (ml.kg-1.km-1) at 1.34 m/s. A statistically significant age effect on walking aerobic demand was observed, with old subjects showing an 8% higher mean aerobic demand than the young subjects. This age-related effect was not associated with shifts in the speed at which aerobic demand was minimized or with the preferred walking speed of older individuals falling on a less economical portion of the speed-aerobic demand curve. Rather, it was speculated that declines in force-generating capacity of muscle in the aged may require recruitment of additional motor units and perhaps an additional proportion of less economical fast twitch muscle fibers to generate necessary forces. Physical activity status had no significant effect on walking aerobic demand.(ABSTRACT TRUNCATED AT 250 WORDS)