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Thesis
Effects of box height on drop jump performance
University of West Florida,
Master of Science (MS), University of West Florida
2019
Abstract
Depth jumps (DJ) are commonly implemented in plyometric training programs in an attempt to enhance lower extremity jump performance. However, it is unknown how different box heights affect jump height (JH) and ground contact time (GCT). PURPOSE: The purpose of this study was to assess jump heights and ground contact time of depth jumps from various box heights. METHODS: Twenty college students who engaged in plyometric training (M = 13, F = 7; age: 22.80 ± 2.69 yr, height: 175.65 ± 11.81 cm, mass: 78.32 ± 13.50 kg) performed DJs from 30 cm (DJ30), 45 cm (DJ45), 60 cm (DJ60), 76 cm (DJ76), and 91 cm (DJ91). A 16 camera Vicon system was used to track reflective markers bilaterally to calculate JH (ASIS, PSIS), while a Kistler force plate was used to record GCT. JH and GCT were compared using a 2x5 (sex x box height) repeated measures ANOVA. RESULTS: There was no interaction but there was a main effect for sex where both JH (M>F) and GCT (F>M) showed a significant M bias. There was no box height main effect for JH DJ30 (.4934 ± .1126 m), DJ45 (.5003 ± .1134m), DJ60 (.4936 ± .1195 m), DJ76 (.4957 ± .1105 m), DJ91 (.4783 ± .1162 m) but there was for GCT where DJ30 (.3584 ± .0971 s), DJ45 (.3605 ± .10528 s) and DJ 60 (.3723 ± .1049) were not significantly different from each other but were all less than DJ76 (.3962 ± .1161) and DJ91 (.4209 ± .1154). CONCLUSIONS: Increasing box height beyond 60cm increased GCT but did not affect JH. Therefore, practitioners designing plyometric training programs that implement DJs in order to increase JH may stop at a box height of 60cm. This would keep GCT minimal which might play a role in other power and speed events.
Details
- Title
- Effects of box height on drop jump performance
- Resource Type
- Thesis
- Contributors
- Lee Brown (Committee Member) - University of West FloridaEric Greska (Committee Member) - University of DelawareLudmila M Cosio Lima (Committee Chair) - University of West Florida, Usha Kundu, MD College of Health
- Publisher
- University of West Florida,; Pensacola, Florida :
- Format
- pdf
- Number of pages
- ix, 53 leaves
- Copyright
- © 2019 Cameron Douglas Addie
- Identifiers
- 99380090743806600
- Academic Unit
- School of Education
- Language
- English
- Awarding Institution
- University of West Florida; Master of Science (MS)
- Theses and Dissertations
- Master of Science (MS), University of West Florida