Examining Reproducibility of Force-Exertion Pattern and Reliability of Force-Time Parameters in the Development Phase During Static Explosive Grip Exertion

Demura, Shinichi; Yamaji, Shunsuke; Minami, Masaki; Nagasawa, Yoshinori; Kita, Ichiro; Matsuzawa, Jinzaburo

doi:10.7600/jspfsm1949.48.493

Cited by 6 publications

(11 citation statements)

References 15 publications

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“…Until now, attention has been paid to only MGS in general grip strength exerted by isometric contraction, but Demura et al (4) tried to evaluate muscle power by force-time parameters exerted during explosive isometric gripping. They report that the ICC of the maximal grip value was more than 0.9, but the ICC of the force-time parameters was lower than 0.7.…”

Section: Discussionmentioning

confidence: 99%

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Evaluation of Muscle Power Exerted by Explosive Gripping

Demura

Miyaguchi²

2009

Journal of Strength and Conditioning Research

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Demura, S and Miyaguchi, K. Evaluation of muscle power exerted by explosive gripping. J Strength Cond Res 23(2): 465-471, 2009-To establish the evaluation method for muscle power exerted by explosive gripping, this study aimed to examine the reliability of parameters and the muscle power output properties in both genders. Fifteen young men and 15 women participated in this study. Each subject carried out explosive grip tests twice using a simple muscle power measurement device (weight loading method), each time with 20, 30, 40, and 50% loads of maximum grip strength (MGS) by isometric contraction. Peak power was drawn from the product of the measured peak velocity and relative loads. The reliability of each parameter in all loads was good (interclass correlation coefficient .0.75) for both genders. The MGS showed insignificant correlation with all parameters. Peak power values were larger in men than in women for all loads, and the women's values were 44.5-52.2% of the men's. A large gender difference was found for 20% MGS. In conclusion, the reliability of muscle power parameters measured by the measurement device in this study is high. It was judged that the device used in this study can properly evaluate the gender difference in muscle power output properties by explosive gripping.

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Section: Discussionmentioning

confidence: 99%

“…Demura et al (4) tried to evaluate muscle power by force-time parameters exerted during explosive isometric gripping. They reported that the interclass correlation coefficient (ICC) of the maximal grip value was more than 0.9, but the ICC of the force-time parameters was lower than 0.7.…”

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confidence: 99%

Evaluation of Muscle Power Exerted by Explosive Gripping

Demura

Miyaguchi²

2009

Journal of Strength and Conditioning Research

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“…The larger grip strength was selected as a representative value. The measurement of the explosive hand grip exertion was performed using methods based on the report of Demura et al (1999). After a signal, the subjects exerted explosive hand grip in the same posture as when measuring maximal strength, and after 5 seconds the signal to cease was sounded.…”

Section: Measurement Of the Hand And Toe Grip Exertionsmentioning

confidence: 99%

“…Until now, studies on handgrip have been mainly performed by using the dominant hand (Demura et al, 1999;Nakada & Demura, 2013;Nakada et al, 2005;Yamaji et al, 2002;Yamaji et al, 2000). Meanwhile, a previous study examined the toes during bipedal walking (Hughes et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

“…However, the laterality of explosive force exertion in the hand and toe grips has not been studied thoroughly. Demura et al (1999) examined the force exertion characteristics of the development phase during explosive force exertion using a handgrip device. A similar study using both hand and toe grip devices may facilitate a comparison of both force exertion characteristics.…”

Section: Introductionmentioning

confidence: 99%

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The Characteristics and Laterality of Explosive Force Exertion of Hand Grip and Toe Grip

Nakada¹,

Demura²

2014

APE

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This study examines the force exertion characteristics and laterality of maximal explosive force exertion of hand grip and toe grip. Fifteen male subjects, aged 19 to 23 years, performed maximal explosive hand grip and toe grip exertions with their dominant and non-dominant sides. Maximal force value and integral force for 2 sec in the hand grip exertions were significantly larger than those in the toe grip exertions in both the dominant and non-dominant sides. The time required to achieve 90% maximal force value in the hand grip exertions was significantly shorter than that in the toe grip exertions in both sides. Correlations between the dominant and non-dominant sides were significant (r = 0.710 -0.889) in maximal force value and integral force for 2 sec during the hand and toe grip exertions, but they were not significant (hand grip: r = 0.242, toe grip: r = 0.032) with respect to the time taken to achieve 90% maximal force value. In conclusion, a force exertion value increases more quickly in an explosive hand grip than that in an explosive toe grip. The laterality may relate to time parameters in both explosive force exertions, but not to ones related to force.

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Force-time parameters during explosive isometric grip correlate with muscle power

et al. 2007

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Although explosive isometric contraction provides little work toward the outside, force-time parameters of the rising phase of the force-time curve may be able to predict muscle power. The purpose of this study was to examine the relationship between muscle power with work (power grip) and force-time parameters during the rising phase in explosive isometric grip. Fifteen healthy young adult males participated in this study. Power grip was measured using loads of 20-50% MVC (peak isometric force). Subjects pulled explosively on a grip bar held with the second digital joints without the thumb. Peak power was calculated from peak velocity and load. Explosive isometric grip was measured using a hand dynamometer. Time-series data of both tests were sampled by an analog-to-digital interface. Both tests were performed with the subjects seated with a sagittal and horizontal position of the arm supported by an armrest. Peak power in the power grip test tended to be larger with an increase of the load, but there was no significant difference between 40% and 50% MVC. Only the peak power in 50% MVC significantly correlated with peak grip force (r = 0.52, p < 0.05). The force-time parameters related to the peak rate of the rising force phase in explosive isometric grip significantly correlated with the peak powers (30-50% MVC) (r = |0.58-0.78|). Peak rate of the rising force phase in explosive isometric grip may be useful for predicting muscle power with loads between 30-50% MVC.

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Examining Reproducibility of Force-Exertion Pattern and Reliability of Force-Time Parameters in the Development Phase During Static Explosive Grip Exertion

Abstract: The evaluation of muscular power function has been mainly limited to dynamic contraction, but

Cited by 6 publications

References 15 publications

Evaluation of Muscle Power Exerted by Explosive Gripping

Evaluation of Muscle Power Exerted by Explosive Gripping

The Characteristics and Laterality of Explosive Force Exertion of Hand Grip and Toe Grip

Force-time parameters during explosive isometric grip correlate with muscle power

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