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effects of box height on drop jump performance

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Date Issued:
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.
Title: The effects of box height on drop jump performance.
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Name(s): Addie, Cameron Douglas, author.
Type of Resource: text
Genre: Bibliography
Text-txt
Academic Theses.
Electronic Thesis Or Dissertation.
Issuance: monographic
Date Issued: 2019
Other Date: 2019.
Publisher: University of West Florida,
Place of Publication: Pensacola, Florida :
Physical Form: electronic resource
Extent: 1 online resource (ix, 53 leaves : charts)
Language(s): eng
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.
Identifier: 1145027700 (oclc), WFE0000682 (IID)
Note(s): by Cameron Douglas Addie.
Department of Movement Sciences and Heath, College of Health
Thesis (M.S.) University of West Florida 2019
Includes bibliographical references.
Also available in print.
Subject(s): University of West Florida
Kinesiology
Academic theses
Library Classification: LD1807.F62k 2019 A335
Persistent Link to This Record: http://purl.flvc.org/uwf/fd/WFE0000682
Use and Reproduction: http://rightsstatements.org/vocab/InC-EDU/1.0/
Host Institution: UWF

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