Abdominal and Back Muscle Strength (A preliminary report) : Normal Subjects

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  • 腹筋 背筋筋力 (第1報)-健常者について-

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We tried to determine normal trunk muscle strength (abdominal and back muscle) values of several ages and males and females by using Cybex II isokinetic dinamometer on 132 normal subjects (72 males, 60 females). Their ages were in the 20s, 30s and 40s. And, we discussed influence of trunk muscle strength values by height, weight and lever arm's length. The results showed that abdominal muscle strength was weaker than back muscle strength regardless of sex. Also abdominal and back muscle strength of males versus females showed males were stronger in the long run. These showed the same results in any age group. The ratio of abdominal to back muscle strength in males had a mean value of 43.6%. It was the highest in 20s, and almost the same percentage in 30s and 40s. In females, it was 31.6%, and showed almost the same values in any age group. In addition, height and muscle strength were not related, relation between weight and muscle strength increased significantly in back muscle strength in regards to weight regardless of sex, and relation between lever arm's length and muscle strength increased significantly in the abdominal and back muscle strength compared to arm's length regardless of sex.

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