Author(s): HATASHIMA, K., TANABE, G., HANAKI, Y., KUMAGAWA, D., TANAKA, S., Institution: KOKUSHIKAN UNIVERSITY, Country: JAPAN, Abstract-ID: 769

INTRODUCTION:
Muscular power is considered that one of the main determinants for athletic performance of require the explosive production of force. Weightlifting and its derivatives are considered highly effective training methods for power development because they produce among the greatest power during maximal extension occurs at the hip, knee, and ankle, relative to other traditional resistance exercises (1). However, there are not many reports intervention study of the effect of training using weightlifting and its derivatives. Therefore, the purpose of this study was to investigate that the effects of power development by High-Pull (HP) as a pulling derivative training.
METHODS:
Thirty-one healthy male college students recruited for this study (19.1±1.0years, 172.4±6.4cm, 68.0±7.1kg). The subject performed HP exercise at intensities of resistance that maximal power output during 2days per week in 8 weeks. The peak velocity during three different external loads in HP was calculated in Pre, 4 weeks after (Mid) and 8 weeks after (Post). The peak velocity during three different external loads in HP was calculated in all subjects. After, relationship between the load and velocity was expressed by a linear regression line. The maximal theoretical velocity (V0) and load (L0) were indicated as the interception of the regression line with the vertical and horizontal axis, respectively. In addition, the slope (Slv) of the linear load-velocity relationship were calculated in all subjects. The power during three different external loads in HP was calculated. Relationship between the power and load was expressed by a second-degree polynomial model. The maximal theoretical power (Peak Power: PP) was estimated as the top of the parabola (2). In addition, load at PP was calculated in all subjects. All subjects were divided two groups into velocity-superiority (VG) and force-superiority (FG) based on all subjects Slv in Pre.
RESULTS:
Analysis of variance revealed a significant interaction in V0 between the groups and period (p<0.05). V0 in Pre was significant difference between SG and FG (p<0.05). In addition, there was not observed significant difference between Mid and Post. On the other hand, there was no significant differences of L0 for groups and periods. Although there was a significant difference of period main effect on PP (p<0.05), significant interaction was not observed.
CONCLUSION:
HP exercises was effective for improving the maximal theoretical velocity of the L-V relationship for FG. These findings were supported that the “principle of velocity specificity” as a specific stimulus to promote velocity-specific neural training adaptations (3). From these results, it was suggested that High-Pull training with maximal power output load effective for athletes with inferior high-velocity strength.
REFERENCES:
1) Takei et al., J. strength cond. res, 2021
2) Piceron et al., Eur. J. Appl. Physiol, 2016
3) Cormie et al., Med. Sci. Sports Exerc, 2007