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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS 

The Journal of Sports Medicine and Physical Fitness 2003 March;43(1):28-35

Copyright © 2009 EDIZIONI MINERVA MEDICA

language: English

Reliability and gender differences of static explosive grip parameters based on force-time curves

Demura S. 1, Yamaji S. 2, Nagasawa Y. 3, Sato S. 4, Minami M. 5, Yoshimura Y. 6

1 Department of Physical Education Kanazawa University, Kanazawa, Japan 2 Fukui National College of Technology, Fukui, Japan 3 Akita Prefectural University, Akita, Japan 4 Life-long Sports Core Kanazawa Institute of Technology, Kanazawa, Japan 5 Yonago National College of Technology, Yonago, Japan 6 Fukui University of Technology, Fukui, Japan


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Aim. The pur­pose of ­this ­study was to ­examine the reli­ability and ­gender dif­fer­ences of ­static explo­sive ­grip (SEG) param­e­ters ­based on ­force-­time ­curves.
­Methods. Experi­mental ­design: ­data ­were col­lected ­from 2 ­trials of SEG ­tests on the ­same day and 2 ­trials 1 ­week ­later. Par­tic­i­pants: 50 ­healthy ­young ­males (21.2±1.57 yrs) and ­females (20.1±1.18 yrs) par­tic­i­pated in ­this ­study. Meas­ures: 12 var­i­ables ­based on fac­tors ­such as ­time-­course of ­force, ­average ­force, inte­grated ­area, max­imal ­rate of ­force devel­op­ment, the ­product of ­force and incli­na­tion and expo­nen­tial func­tion of ­force devel­op­ment (EXP-M) ­were ­selected as ­force-­time param­e­ters in SEG ­testing.
­Results. A sig­nif­i­cant reli­ability was ­obtained for all ­force-­time param­e­ters ­except the ­time to 90% of max­imal ­grip ­strength (MAX), ­with the reli­ability of inte­grated ­area, ­average ­force, max­imal ­rate of ­force devel­op­ment (­DFmax), and the ­product of ­force and incli­na­tion ­being par­tic­u­larly ­high (ICC=0.633-0.930 for the ­same day, ICC=0.612-0.828 for dif­ferent ­days). ­There ­were ­gender dif­fer­ences for all param­e­ters ­except the ­time to MAX and EXP-M (p<0.05). In addi­tion, ­many of the cor­re­la­tion coef­fi­cients ­between param­e­ters ­were ­high, par­tic­u­larly for ­males. The ­average ­force, inte­grated ­area for 1 ­sec, and the ­product of ­force and incli­na­tion ­during the devel­op­mental ­phase sig­nif­i­cantly cor­re­lated ­with MAX in ­both ­males and ­females. The ­ratio ­between ­males and ­females in ­these ­force-­time param­e­ters was ­smaller ­than ­that of MAX (71.3%).
Con­clu­sion. It is con­sid­ered ­that ­these param­e­ters are depen­dent on the ­speed of ­muscle con­trac­tion. ­These ­results sug­gest ­that the eval­u­a­tion param­e­ters, ­such as ­average ­force, inte­grated ­area, the ­product of ­force and incli­na­tion, and max­imal ­rate of ­force devel­op­ment are ­useful for eval­u­ating ­static explo­sive ­grip.

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