Abstract
This study attempted to develop a formula for predicting maximum muscle strength value for young, middle-aged, and elderly adults using theoretical Grade 3 muscle strength value (moment fair: Mf)—the static muscular moment to support a limb segment against gravity—from the manual muscle test by Daniels et al. A total of 130 healthy Japanese individuals divided by age group performed isometric muscle contractions at maximum effort for various movements of hip joint flexion and extension and knee joint flexion and extension, and the accompanying resisting force was measured and maximum muscle strength value (moment max, Mm) was calculated. Body weight and limb segment length (thigh and lower leg length) were measured, and Mf was calculated using anthropometric measures and theoretical calculation. There was a linear correlation between Mf and Mm in each of the four movement types in all groups, excepting knee flexion in elderly. However, the formula for predicting maximum muscle strength was not sufficiently compatible in middle-aged and elderly adults, suggesting that the formula obtained in this study is applicable in young adults only.
Highlights
Evaluation of muscle strength is an important element of the evaluation of patients exhibiting musculoskeletal system or nervous system impairment [1,2,3]
After calculating theoretical Grade 3 muscle strength values from body weight and limb segment length for each experimental task, measuring the actual isometric maximum muscle strength using an HHD, and performing a test for noncorrelation and regression analysis, we found a linear relationship between the maximum muscle strength value and the theoretical Grade 3 muscle strength value for each of the eight experimental tasks
The relationship between Mf and Mm, as calculated based on the Grade 3 determination baseline according to the MMT grading by Daniels et al [7], was investigated for four experimental tasks in three age brackets
Summary
Evaluation of muscle strength is an important element of the evaluation of patients exhibiting musculoskeletal system or nervous system impairment [1,2,3]. It is indispensable in clinical evaluations, design and implementation of suitable therapeutic programs, and the prediction of functional ability [4, 5], and so high accuracy and reliability are necessary when performing such an evaluation [6]
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