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Garner, John C.
- Effects of Whole Body Vibration on Vertical Jump Performance Following Exercise Induced Muscle Damage
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PDF Views:134
Authors
Affiliations
1 Department of Kinesiology, California State University, San Bernardino 5500 University Parkway, HP 210, San Bernardino, CA 92407, US
2 Department of Kinesiology, California State University, Fullerton 800 N. State College Blvd, Fullerton, CA 92833, US
3 Department of Health, Exercise Science, & Recreation Management, The University of Mississippi PO Box 1848, Turner 215. University, MS 38677, US
1 Department of Kinesiology, California State University, San Bernardino 5500 University Parkway, HP 210, San Bernardino, CA 92407, US
2 Department of Kinesiology, California State University, Fullerton 800 N. State College Blvd, Fullerton, CA 92833, US
3 Department of Health, Exercise Science, & Recreation Management, The University of Mississippi PO Box 1848, Turner 215. University, MS 38677, US
Source
International Journal of Kinesiology and Sports Science, Vol 2, No 1 (2014), Pagination: 23-30Abstract
Enhancing vertical jump performance is critical for many sports. Following high intensity training, individuals often experience exercise induced muscle damage (EIMD). Many recovery modalities have been tested with conflicting results. The purpose of this investigation was to determine the effect of whole-body vibration (WBV) on vertical jump performance following EIMD. 27 females volunteered for 7 sessions and were randomly assigned to a treatment or control group and administered each testing day. Vertical jump performance was assessed via vertical jump height (VJH), peak power output (PPO), rate of force development (RFD), relative ground reaction force (GRFz), and peak activation ratio of the vastus medialis (VM) via electromyography (EMG) before and after 3 days of EIMD via split squats. Two testing sets were collected each day, consisting of pre measures followed by WBV or control, and then post second measures. A 2×8 (group × time) mixed factor analysis of variance (ANOVA) was conducted for each variable. No significant interactions or group differences were found in any variable. Significant main effects for time were found in any variable, indicating performance declined following muscle damage. These results indicate that WBV does not aid in muscle recovery or vertical jump performance following EIMD.Keywords
Muscle Recovery, Muscle Soreness, Females.Full Text
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- Ground Reaction forces in Alternative Footwear during Slip Events
Abstract Views :251 |
PDF Views:136
Authors
Affiliations
1 Department of Kinesiology, Mississippi State University, 216 McCarthy Gym Mississippi State, Mississippi 39762, US
2 Department of Health, Exercise Science and Recreation Management, The University of Mississippi Turner 219, University, Mississippi 38677, US
3 Department of Industrial & Systems Engineering, Auburn University 3301-G Shelby Center, Auburn, Alabama 36849, US
1 Department of Kinesiology, Mississippi State University, 216 McCarthy Gym Mississippi State, Mississippi 39762, US
2 Department of Health, Exercise Science and Recreation Management, The University of Mississippi Turner 219, University, Mississippi 38677, US
3 Department of Industrial & Systems Engineering, Auburn University 3301-G Shelby Center, Auburn, Alabama 36849, US
Source
International Journal of Kinesiology and Sports Science, Vol 3, No 2 (2015), Pagination: 1-8Abstract
Slips, trips and falls are major causitive factors for occupational and non-occupational falls. Alternative footwear such has crocs and flip flops have been used in and around work places and communities that can be slip prone environments. The purpose of the study is to analyze the effects of alternative footwear [crocs (CC), flip-flops (FF)] and industry standard slip resistant shoes (LT) on ground reaction forces (GRFs) during slip events. Eighteen healthy male participants following a repeated measures design for each footwear condition, were tested for heel kinematics during normal dry surface gait (NG); unexpected slip (US), alert slip (AS) and expected slip (ES). A 3x4 repeated measures ANOVA was used to analyze the dependent vertical GRFs parameters (Mean Z-GRF and Peak Z-GRF) at p = 0.05. Significant interactions between footwear and gait trials were found for Mean Z-GRF and significant main effect in gait trials for Peak Z-GRF were evident. On average significantly lower GRFs were seen in slip trials compared to normal gait. FF exhibited significantly lower GRFs during slip trials while LT demonstrated lower GRFs in normal gait. The reduced ground reaction forces during all slip events compared to normal gait can be attributed to the incomplete weight transfer on the slipping foot during the unexpected and alert slips and to the anticipation of the slippery environment in expected slips. Flip flops which had greater incidence of slips also demonstrated reduced GRFs compared to CC and LT during slip events, further suggesting incomplete weight transfer, while during normal gait, LT demonstrated reduced GRFs compared to alternative footwear owing to its cushioning midsole properties. The LT with lowest incidence of slips demonstrates to be the choice of footwear for maneuvering slippery flooring conditions and for reducing impact reaction forces during non-slippery flooring conditions.Keywords
Slips, Falls, Alternative Footwear, Ground Reaction Forces, Perception of Slipperiness.Full Text