Analysis of Compression Force in the Hip Joint of Elderly Women
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概要
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Intervention studies for preventing osteoporosis in the elderly often lack sufficient description of the exercise intensity and site of interest, even though bone remodeling is load dependent and site specific. The effect of exercise on bone remodeling cannot be defined without such description. I analyzed compression force in the hip joint to categorize exercise by force applied on bone. Thirty-one healthy elderly women aged 65〜79 participated in the study. Joint compression force at the proximal end of the femur was estimated for twelve exercise regimen varying from low to high-impact exercise, including jumping off, stepping down and heel dropping. Jumping off a 10cm platform showed the highest compression force (1017±301.6 N; 201±79%BW), and heel dropping was the lowest (400±112.1 N; 78±25 %BW). The exercises were categorized into seven homogeneous subsets. For clinical application, I proposed three levels of exercise regimen consisting of heel dropping with the knees in the relaxed position at 80 repetitions per minute, stepping down from a 20 cm platform with the knees in the relaxed or extended position, and jumping off a 10 cm platform with the knees extended. The mean compression forces were 449±129.0 N, 664±181.4 N for knees in the relaxed position and 751±179.8 N for knees in the extended position, and 1017±301.6 N, respectively. These biomechanical guidelines may be useful in further intervention studies for osteoporosis.
- 北里大学の論文
- 2000-06-30