Explosive power and asymmetry in leg muscle function in frequent fallers and non-fallers aged over 65
Explosive power and asymmetry in leg muscle function in frequent fallers and non-fallers aged over 65
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DOI：
10.1093/ageing/31.2.119
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发表时间：
2002-03-01
期刊：
影响因子：
6.7
通讯作者：
Rutherford, OM
中科院分区：
文献类型：
--
作者：
Skelton, DA;Kennedy, J;Rutherford, OM
背景：尽管力量低是跌倒的危险因素，但下肢爆发力比力量更能预测功能困难。力量可能比力量本身更能预测未来的饱腹感。目的：比较 65 岁或以上在家居住的有或没有跌倒史的女性的腿部肌肉力量和爆发力以及腿部力量和爆发力的不对称性。设计：对自我报告的跌倒者与“非跌倒者”进行病例对照研究。受试者：20 名 65 岁或以上、上一年至少有 3 次跌倒史的女性，与 15 名没有跌倒史的女性进行年龄匹配方法：下肢爆发力、股四头肌和腘绳肌的等长力量、股四头肌、腘绳肌的等速向心力量（100度/秒）、踝跖屈肌和背屈肌以及股四头肌偏心力量（100度/秒）。使用自行填写的习惯性活动概况调查问卷来评估习惯性身体活动。结果：有跌倒史的女性活动量较少，但除了根据体重调整的踝背屈外，在任何力量测量中都没有明显变弱。两组的所有腿部肌肉的力量和爆发力均显着不对称。尽管两组的下肢力量都不对称，但摔倒者表现出明显更大的不对称性。当比较力量最弱的腿时，有跌倒史的女性与没有跌倒史的女性相比，其体重的力量要低 24% (P=0.04)。结论：虚弱和不对称在 65 岁及以上的女性中普遍存在，无论是否有跌倒史。对于独立生活的老年女性来说，下肢爆发力差加上四肢不对称可能比传统的力量测量更能预测未来的跌倒。
Background: although low strength is a risk factor for falls, lower limb explosive power is more predictive of functional difficulties than strength. Power may be more predictive of a future fill than strength per se,Objective: to compare leg muscle strength and explosive power and asymmetry of leg strength and power of women aged 65 or over living at home, with and without a history of falls.Design: a case controlled study of self-reported fallers' versus 'non-fallers'.Subjects: twenty women, aged 65 or over, with a history of at least three falls in the previous year were age matched with 15 women with no history of falls in the previous year.Methods: lower limb explosive power, isometric strength of the quadriceps and hamstrings, isokinetic concentric strength (100degrees/sec) of the quadriceps, hamstrings, ankle plantar- and dorsi-flexors and quadriceps eccentric strength (100degrees/sec). Habitual physical activity, was assessed using the self-completed Habitual Activity Profile Questionnaire.Results: the women with a history of Falls were less active but were not significantly weaker in any of the strength measurements, apart from ankle dorsiflexion adjusted for body weight. Both groups had significant asymmetry in all the leg muscles fur both strength and power. Although both groups were asymmetrical in their lower limb power, the fallers demonstrated a significantly greater asymmetry. When the least powerful legs were compared, the women with a history of falls were 24% less powerful for their weight than those who did not fall (P=0.04).Conclusions: weakness and asymmetry is prevalent in women aged 65 and over, with and without a history of falls. Poor lower limb explosive power combined with asymmetry between limbs may be more predictive of future falls than more traditional measurements of strength in older women who live independently.