Analysis of grip strength exertion of athletes according to natori's method

Abstract

1) Tension development during rapidly grip strength exertion of athletes and nonathletes was by Natori's method analyzed. 2) Subjects of athletes were 71 healthy men of 17-26 ages and of non-athletes were 54 healthy men of 17-30 ages. Athletes were 26 high school students of 17-19 ages, 22 physical education college students of 19-21 ages and 23 general adult men of 20-26 ages. High school students were 3 Sumo-men, 4 Judo-men, 6 Kendo-men and 13 Baseball-men. Physical education college students were 6 Handball-men, 9 Rugby-men and 7 Gymnasticsmen. General adult men were 11 Judo-men and 12 Kendo-men. Non athletes were 20 high school students of 17-18 ages, 6 university students of 19-21 ages and 28 general adult men of 21-30 ages. 3) Isometric grip strength manometer were used a new device, to improvement on Smedley's manometer straingauge added. Tension development were amplifired and recorded by portable Visigraph (Sanei-Sokki Ltd.) with paper-speed of 10cm/sec. 4) In the each case was 3 portions of a whole curve of time course of tension and Pmax;P1, P2; log t1, log t2; tanθ, tanψ estimated according Natori's method. 5) Except general adults of 26-30 ages of non-athletes were Pmax. of athletes greater than non-athletes. Pmax, of a Judo-man of general adult was greatest 68.5kg, and Pmax. of a high school student of 17 age of non-athlete smallest 35.8kg. 6) Tan θ and tan ψ of athletes were greater than non-athletes. Tan θ of a Sumo-man of high school student was greatest 0.3628 and tan θ of a Judoman of general adult was greater 0.3500, but tan θ of a high school student of non-athletes was smallest 0.1624. Tan ψ of a Kendo-man of general adult was greatest 1.6308 and tan ψ of a Sumoman of high school student was greater 1.5769, but tan ψ of a high school student of non-athlete was smallest 0.5278. 7) Muscle strength of non-athletes may well increased to be about 25 age, so that Pmax. of general adults of non-athletes were greater and of high school students of nonathletes smaller. But athletes exercised usually for athletic sports, so that Pmax, and tan θ, tan ψ independent of age was greater than non-athletes, these were an each event varied. Pmax. of Judo-men of general adults were relative greater and tan θ, tan ψ were greatest. Pmax. of Handboll-men were greatest but tan θ, tan ψ were relative smaller. Pmax. of Gymnastics-men were relative greater but tan θ, tan ψ were smallest. So that were varied pattern of time course of tension development of hand grip exertion an each event of athletics. © 1974, The Japanese Society of Physical Fitness and Sports Medicine. All rights reserved.