Zimmerman, M. Nadine
M.S. (Master of Science)
Department of Physical Education
This study compared the reaction times and horizontal and vertical velocities of middle blockers responding to a two-light (2) stimulus and a three- light (3) stimulus. Twelve highly trained female volleyball players, 16 through 19 years of age, were filmed performing the jab cross-over step followed by a block jump under both light stimulus conditions to their preferred (P) and nonpreferred (N) sides. A significant difference (p < .05) was found among the reaction times for subjects responding to a two-light and a three-light stimulus (P2 = 0.253 ± .04 sec; P3 = 0.275 ± .05 sec; N2 = 0.253 ± .06 sec; N3 = 0.281 ± .05 sec). However, no significant differences were found in reaction times for subjects responding to the preferred and nonpreferred sides. Also, the interaction between the two factors was not significant. For the hurdle component of the jab cross-over step, horizontal velocities at takeoff (P2 = 3.50 ± .19 m/s; P3 = 3.52 ± .19 m/s; N2 = 3.59 ± .17 m/s; N3 = 3.59 ± .22 m/s) were not found to be significantly different (p > .05). The average horizontal velocities of the complete lateral movement (P2 = 2.16 ± .15 m/s; P3 = 2.15 ± .14 m/s; N2 = 2.16 ± .14 m/s; N3 = 2.22 ± .23 m/s) were not different across conditions (p > .05). Again, for vertical velocities at takeoff of the block jump (P2 = 2.51 ± .22 m/s; P3 = 2.57 ± .23 m/s; N2 = 2.57 ± .24 m/s; N3 = 2.59 ± .23 m/s) no significant differences were found (p > .05). The results suggest that highly trained middle blockers have a greater reaction time when responding to a three- light stimulus than to a two-light stimulus, but that the investigated velocities are not significantly different across the light or direction conditions.
Silva, Lori Ann, "An analysis of the reaction times and horizontal and vertical velocities of the middle blocker in volleyball" (1989). Graduate Research Theses & Dissertations. 1155.
x, 56 pages
Northern Illinois University
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