The purpose of this study was to compare and examine the left-right differences in the blocking focusing on ground reaction forces in female volleyball players. The subjects were 13 Japanese college of a women`s volleyball players (age: 19.2 ± 1.2 years, height: 169.1 ± 5.4 cm). 10 consecutive force plates (Tec Gihan Co.) were used to measure the blocks. The players were told that the toss from the setter would go up randomly in one of the left or right directions, and they were asked to block in response to the toss from the center of the net. The results showed that the left side performed better in terms of maximum ground reaction force at takeoff (p = 0.00, d = 1.25). In addition, there were significant differences between MB vs OH (p = 0.03) and MB vs OP (p = 0.02) for the positions, and between left and right for OH and MB. Lobietti et al (2009) conducted a kinematic analysis of spike jump and block movements, suggesting a similarity between spikes and blocks when moving to the left. All subjects in this study were right-handed, it is assumed that they tended to perform better on the left side, which is a block stepping like spike stepping. In addition, we also presume that no significant difference between the left and right in MB because they always blocked both sides often.
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