Fat mass limits lower-extremity relative strength and maximal walking performance in older women.
Fat mass limits lower-extremity relative strength and maximal walking performance in older women.
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DOI：
10.1016/j.jelekin.2011.07.006
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发表时间：
2011-10
影响因子：
2.5
通讯作者：
Millett, Erica D.
中科院分区：
文献类型：
--
作者：
LaRoche, Dain P.;Kralian, Rachel J.;Millett, Erica D.
本研究的目的是确定是否多余的脂肪会对超重的老年妇女的相对力量和步行步态产生负面影响。25名老年女性（65 - 80岁）被分为正常体重组（BMI < 25 kg m−2，n=11）和超重组（BMI ≥ 25 kg m−2，n=14）。测量膝伸肌和屈肌、踝跖屈肌和背屈肌的力量和扭矩发展率（RTD）。参与者以标准和最大速度行走，在此期间测量肌肉激活、时空和动力学步态变量。相对于体重，超重的老年妇女有24%的最大扭矩和38%的RTD低于正常体重的妇女。超重者的最大步行速度较慢（1.25 ± 0.22 m s-1 vs. 1.54 ± 0.25 m s-1，P = 0.004），与力量（r = 0.53，P < 0.01）和脂肪量（r =-0.65，P = 0.001）相关。在最大速度下，超重者的垂直地面反作用力相对于体重降低11%，步速降低8%，步幅缩短12%，足-地接触时间延长13%，双肢支撑时间延长21%，膝伸肌和跖屈肌激活增加65%和78%（P < 0.05）。超重的老年妇女表现出步态改变和行走能力下降，这与下肢肌肉的相对力量和扭矩发展速度差有关。
The purpose of this study was to determine if excess fat negatively affects relative strength and walking gait performance in overweight, older women. Twenty five older women (65 – 80 yr) were separated into normal weight (BMI < 25 kg m−2, n=11) and overweight groups (BMI ≥ 25 kg m−2, n=14). Strength and rate of torque development (RTD) of the knee extensors and flexors, ankle plantarflexors and dorsiflexors were measured. Participants walked at standard and maximal speeds during which muscle activation, spatiotemporal and kinetic gait variables were measured. Relative to mass, overweight older women had 24% lower maximal torque and 38% lower RTD than normal weight women. Maximal walking speed was slower in overweight (1.25 ± 0.22 m s−1 vs. 1.54 ± 0.25 m s−1, P = 0.004) and was correlated to strength (r = 0.53, P < 0.01) and fat mass (r = −0.65, P = 0.001). At maximal speed, overweight had 11% lower vertical ground reaction force relative to mass, 8% slower stride rate, 12% shorter strides, 13% longer foot-ground contact times, 21% longer double-limb support times, 65% greater knee extensor and 78% greater plantarflexor activation (P < 0.05). Overweight, older women demonstrated altered gait and reduced walking performance related to poor relative strength and rate of torque development of lower-extremity muscles.
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影响因子：
2.4
作者：
Hof, AL
通讯作者：
Hof, AL
DOI：
10.1249/mss.0b013e318076b54b
发表时间：
2007-09-01
期刊：
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
影响因子：
--
作者：
Browning, Raymond C.;Kram, Rodger
通讯作者：
Kram, Rodger
影响因子：
4.9
作者：
Stenholm, S.;Alley, D.;Bandinelli, S.;Griswold, M. E.;Koskinen, S.;Rantanen, T.;Guralnik, J. M.;Ferrucci, L.
通讯作者：
Ferrucci, L.
影响因子：
2.4
作者：
Ko, Seung-uk;Stenholm, Sari;Ferrucci, Luigi
通讯作者：
Ferrucci, Luigi
影响因子：
5
作者：
Corrada, MM;Kawas, CH;Paganini-Hill, A
通讯作者：
Paganini-Hill, A