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Validation of a rotary encoder and power prediction equations during a jump squat

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dc.contributor.advisor Kernozek, Thomas
dc.contributor.advisor Mikat, Richard
dc.contributor.advisor Wright, Glenn
dc.contributor.author Pustina, Andrew
dc.date.accessioned 2011-02-10T18:17:14Z
dc.date.available 2011-02-10T18:17:14Z
dc.date.issued 2010-09-02
dc.identifier.uri http://digital.library.wisc.edu/1793/48318
dc.description.abstract The purpose of this study was twofold: first, it was to determine the validity of a rotary encoder at measuring power and velocity; second, it was to expand the validity of the use of various power prediction equations using counter movement jump height. METHODS: Sixty college students (men n=30; women n=30) performed a jump squat with applied loads of 20%, 40%, and 60% of their body mass. Each jump squat (JS) was simultaneously monitored using a force plate, a rotary encoder, and a contact mat. Peak power (PP) was calculated using the time and position data derived from the rotary encoder, while the force plate determined PP from vertical ground reaction force. The contact mat measured jump height, which was entered into the prediction equations (8, 19) to estimate peak power. All calculations were compared to the force plate. A significant difference was found between force plate measurements and TWA measurements of peak power, average power, peak velocity and average velocity (p<0.01). Pearson correlations showed that rotary encoder power measurements had a strong relationship to force plate power measurements at all loads (r = >0.80). In addition, no significant difference between force plate PP and predicted PP by the Harman equations was found (p = 0.06). The Harman equation had a greater correlation with the force plate in men (r = 0.93 - 0.94) than in women (r = 0.65 - 0.72). The results of this study suggest that the Harman equation should be used to estimate PP of a loaded JS because it was found to be both reliable and valid. en
dc.description.provenance Submitted by Elle Parker (parker.elle@uwlax.edu) on 2011-02-10T18:17:14Z No. of bitstreams: 1 PustinaAndrew2010.pdf: 6495648 bytes, checksum: b0a7442e20c849db797c2dec704e9a3d (MD5) en
dc.description.provenance Made available in DSpace on 2011-02-10T18:17:14Z (GMT). No. of bitstreams: 1 PustinaAndrew2010.pdf: 6495648 bytes, checksum: b0a7442e20c849db797c2dec704e9a3d (MD5) Previous issue date: 2010-09-02 en
dc.language.iso en_US en
dc.subject Muscle strength -- Testing en
dc.subject Exercise -- Equipment and supplies en
dc.subject Athletes -- Training of en
dc.title Validation of a rotary encoder and power prediction equations during a jump squat en
dc.type Thesis en
thesis.degree.discipline Exercise and Sport Science--Human Performance en

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