Thesis (Ph. D.)--Columbia University, 1934. / Bibliography: p. 31.

The purpose of this study was to investigate which factor in depth jumping, landing momentum or landing velocity, is the more effective in improving vertical jump. Three depth jump training conditions were utilized: a high velocity, high momentum condition in which the subjects (n=10) jumped unloaded from their individual optimum heights (the height where their rebound height equaled the height jumped from); a low velocity, high momentum condition in which the subjects (n=10) jumped wearing weight jackets that weighed 15% of their body weight from heights that resulted in their landing momenta being equal to their calculated landing momenta had they been performing the high velocity, high momentum conditions; and a medium velocity, low momentum condition in which the subjects (n=8) jumped unloaded from heights midway between their optimum heights and their calculated jump heights had they been performing the low velocity, high momentum condition. Twenty-eight male members of University of British Columbia athletic teams volunteered as subjects. Each team was divided equally between, but individual team members assigned randomly to, each of the three experimental conditions. The depth jump programs consisted of four sets of eight jumps twice a week for the first three weeks and five sets of eight jumps three times a week for the last three weeks. All subjects were tested at the beginning, middle and end of the study on the Sargeant Jump Test, Standard Depth Jump Test (performed from an 18 in platform). Knee Extension Strength Test and Plantar Flexion Strength Test. Multivariate analysis of variance revealed that performance of all three training conditions resulted in improvement of vertical jump, standard depth jump and plantar flexion strength (all significant at the .01 level) and that there were no significant differences between the conditions in improvement on these measures. No significant improvement was seen in knee extension strength in any of the conditions. Pearson Product Moment Correlation of the four variables showed that there were strong correlations between sargeant jump and standard depth jump (significant at the .01 level) and between knee extension strength and plantar flexion strength (significant at the .05 level)-but no significant correlations between the jump and strength measures. At the end of the study a force platform was utilized to record the reaction force characteristics of eight subjects while they performed jumps under each of the three training conditions. Multivariate analysis of variance of the data revealed significant differences between the conditions on the impulse variables and no significant differences between the conditions on time or force variables. Post-hoc Newman-Kuels multiple comparison tests revealed that the impulses of the subjects when jumping under the low velocity, high momentum condition were significantly greater (at the .05 level) than the impulses recorded when the subjects were jumping in the other two conditions (which were not significantly different from each other). The results of this study did not indicate clearly which factor in depth jumping, landing momentum or landing velocity, was more effective in improving vertical jump. / Education, Faculty of / Curriculum and Pedagogy (EDCP), Department of / Graduate

Thesis (M.S.)--Marshall University, 2003. / Title from document title page. Document formatted into pages; contains vi, 42 p. Includes bibliographical references (p. 28-30).

Thesis (MHSc--Health Science) -- Auckland University of Technology, 2004. / Also held in print (271 leaves, col. ill., 30 cm.) in Wellesley Theses Collection. (T 796.324 HEN)

Thesis (M.S.)--Northern Michigan University, 2009. / Bibliography: leaves 24-26.

With the current emphasis on jumps and jump combinations in competitive figure skating, training methods to improve jumping ability would be of great benefit to figure skaters. To be a successful jumper, a figure skater needs leg power in addition to skill and technique. Jump combinations, comparatively new elements of free skating, require leg power combined with balance, positioning, and timing. To develop the leg power required in jumping, depth jumping was tested as a potential training method for skaters. Depth jumping, a relatively new training technique, is designed to improve leg power and the reactive ability of jumpers. In performing a depth jump, the athlete jumps down from an elevated surface and immediately takes off for a second jump upon contact with the floor. The emphasis is on immediate takeoff after landing from a previous jump so that the athlete learns to use the elastic recoil of muscle to produce an additive effect on jump height. The purpose of this investigation was to determine the effects of a six week depth jumping program on vertical jumping ability on and off the ice. A subproblem of this study was to determine the relationship between vertical jumping ability on the ground and on the ice. The sample consisted of twenty-seven female figure skaters from the Vancouver area (mean age 14.9 years) who volunteered to take part. Subjects were randomly assigned to experimental (n = 14) and control (n = 13) groups. The experimental group participated in a six week depth jump training program conducted off the ice in addition to their regular training on and off the ice. The control group did not participate in the depth jump program but participated in their regular training on and off the ice. The depth jump program consisted of two preparatory exercises and five training exercises performed from various heights (12", 15", 18", 21"). Training sessions were held twice per week for the first three weeks and three times per week for the last three weeks. The study included a total of sixteen training sessions. All subjects were tested at the beginning, middle, and end of the study on the Sargent Jump Test and filmed (pre and post only) on the ice performing a single loop, single loop combination jump. Films were analyzed on the Vanguard Motion Analyzer. The following hypotheses were tested for significance at the .05 level: 1. As a result of depth jump training, there is a significant increase in vertical jumping ability on the ground. 2. As a result of depth jump training, there is a significant increase in the height of the second jump of a single loop, single loop combination jump. 3. There is a positive linear relationship between vertical jumping ability on the ground and vertical jumping ability on the ice. Multivariate analysis of variance revealed that hypothesis #1 is supported at the .01 level and hypothesis #2 is supported at the .05 level of significance. The Pearson Product Moment Correlation showed that hypothesis #3 is also accepted at the .05 level. / Education, Faculty of / Curriculum and Pedagogy (EDCP), Department of / Graduate

The purpose of this study was to initiate the development of a database of values for the five-hop and vertical jump field tests for dominant and non-dominant legs in youth nine to seventeen years of age. Two hundred one youths, 102 males and 99 females, participated in all facets of the study. One trial of the five-hop test was performed on each leg and one trial was performed on each leg, then both legs, for the vertical jump test. Stature ranged from 1.41 ± 0.06 to 1.70 ± 0.07 meters for females and 1.44 ± 0.08 to 1.81 ± 0.06 meters for males. Mass ranged from 34.8 ± 4.8 to 64.3 ± 11.4 kilograms for females and 35.2 ± 10.5 to 73.1 ± 16.0 kilograms for males. Significant differences (p < 0.05) were found in dominant and non-dominant leg hops between males and females ages 12-17. Significant differences (p < 0.05) were found in dominant leg vertical jumps between males and females at ages 12-14 and 16-17 and in non-dominant leg vertical jumps at ages 12, 16 and 17. Twelve year olds had a significant difference (p < 0.05) between males and females when dominant leg hop distance was normalized to mass. When comparing non-dominant hop distance to dominant hop distance, significant differences (p < 0.05) were found between males and females 15 years of age. Values obtained for this ratio agree with the literature for adult hop ratios and suggest that limb asymmetry/deficiency determination be set at 0.85 for youth. / School of Physical Education

Thesis (M.A.)--California State University, Chico, 2005. / Includes bibliographical references (leaves: 83-87). Also available online (PDF file) by a subscription to the set or by purchasing the individual file.

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