Lower-extremity kinetic response to activity program dosing in older adults
Lower-extremity kinetic response to activity program dosing in older adults
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DOI：
10.1123/jab.17.2.103
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发表时间：
2001-05-01
影响因子：
1.4
通讯作者：
Greendale, GA
中科院分区：
文献类型：
--
作者：
Salem, GJ;Wang, MY;Greendale, GA
本研究的目的是确定两种剂量的负重背心对老年人急性下肢步态动力学的影响。对56名男性和女性志愿者（73.8 +/- 6.9岁）的踝关节、膝关节和髋关节净力矩峰值进行了量化，这些志愿者参加了一项为期B个月的体力活动研究。在最初的研究访问中，参与者以正常的速度进行了6次步行试验（3次带背心，3次不带背心）。在背心穿着试验期间，参与者穿着装载有体重（BW）的0%（n = 19）、BW的3%（n = 16）或BW的5%（n = 21）的背心。与0%BW组相比，5%BW组的最大峰值跖屈力矩随着背心的急性应用增加了5.7%，p < 0.01。与0%背心重量组相比，当施加5%BW时，膝关节伸展力矩增加13.8%，p < 0.01：3%BW组中的轻微显著治疗效果明显，p = 0.04。尽管有这些急性变化，但当受试者每天穿背心2小时，每周穿背心4天，持续27周，没有额外的运动处方时，膝盖力量和身体表现并没有改善。这些研究结果表明：（a）背心介导的下肢动力学的急性变化不是全身性的，而是关节特异性的和负荷依赖性的，和（B）加权背心处方应大于5%BW而不进行预定的运动，或应包括处方的运动，以引起老年人的长期力量和身体表现增益。
The purpose of this investigation was to determine the effects of two doses of a weighted vest on acute lower-extremity gait kinetics in older adults. Peak ankle, knee, and hip net joint moments were quantified in 56 men and women volunteers (73.8 +/- 6.9 years old) enrolled in a B-month physical activity study. At the initial study visit, participants underwent 6 walking trials (3 with vest, 3 without vest) at their normal pace. During the vest-wearing trials, participants wore a vest loaded with either 0% of body weight (BW) (n = 19), 3% of BW (n = 16), or 5% of BW (n = 21). With acute application of the vests, maxi mum peak plantarflexion moments increased by 5.7% in the 5% BW group compared to the 0% BW group, p < 0.01. Compared to the 0% vest-weight group, knee extension moments increased by 13.8% when 5% BW was applied, p < 0.01: a marginally significant treatment effect was evident in the 3% BW group, p = 0.04. Despite these acute alterations, knee strength and physical performance did not improve when subjects wore the vests 2 hours a day, 4 days a week for 27 weeks, without additional exercise prescription. These findings suggest that: (a) the acute changes in vest-mediated lower-extremity kinetics are not systemic but joint specific and load dependent, and (b) weighted vest prescription should be greater than 5% BW without pre scribed exercise, or should include prescribed exercises, to invoke long-term strength and physical performance gains in older adults.