Examining reproducibility of force-exertion pattern and reliability of force-time parameters in the development phase during static explosive grip exertion.
- VernacularTitle:静的瞬発握力発揮時の増張力局面における発揮パターンの再現性と力‐時間変数の信頼性の検討
- Author:
SHINICHI DEMURA
;
SHUNSUKE YAMAJI
;
MASAKI MINAMI
;
YOSHINORI NAGASAWA
;
ICHIRO KITA
;
JINZABURO MATSUZAWA
- Publication Type:Journal Article
- Keywords:
force-time parameter;
static explosive grip;
reliability
- From:Japanese Journal of Physical Fitness and Sports Medicine
1999;48(4):493-500
- CountryJapan
- Language:Japanese
-
Abstract:
The evaluation of muscular power function has been mainly limited to dynamic contraction, but force-time parameters in static explosive contraction may be useful. The purpose of this study was to examine the trial-to-trial differences of exertion pattern and the reliability of the force-time parameters in the development phase of static maximal explosive grip (SEG) using seventy healthy young male subjects (age 18.8±2.3yr) . In SEG measurement, subjects were instructed to exert maximal isometric force with a dominant hand as fast and forcefully as possible. Data was collected from two trials with 3 minutes rest between trials. Eleven variables (time to fixed level, average force, integrated area, maximal rate of force development, and equivalent for mechanical power parameter) were selected as force-time parameters.
The reliability of maximal grip strength (MAX) was very high (ICC=0.944, p<0.05) . In the above-stated instruction condition, the trial-to-trial difference expanded from 0.1- 0.4 sec, then re-duced in the vicinity of MAX during SEG exertion. Significant differences, however, were not found at any exertion time and reproducibility of SEG exertion pattern was very high between the two trials. The trial-to-trial reliability in all force-time parameters was significant (ICC=0.346-0.878, p<0.05) .
Reliability of the parameters measuring the earlier phase (about 0.1-0.5 sec) was low or moderate (ICC<0.7), while reliability of the parameters measuring the MAX vicinity tended to be high. The MAX relationship to force-time parameters in the MAX vicinity is high, but is low or moderate for the other parameters. It was suggested that the force-time parameters in the vicinity of MAX in SEG exertion might be useful for evaluating static power function in a clinical setting.
