Biomechanical effects of an acute bout of fatigue on vertical jumps in netball players
University of Wales Institute Cardiff
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The aim of this investigation was to examine the effect of biomechanical factors, after an acute bout of fatigue, on the lower extremities in vertical jumps on netball goalkeepers. Four female subjects were used with mean (±SD) age of 21.25 yrs (±1.26), mean height of 1.72 m (±0.05), and a mean body mass of 67 kg (±5.2). Fatigue is a major contributing factor to decrements in performances, which are critical to competitive situations. Eight maximum vertical jump trials were performed unfatigued, four using the dominant limb, and four using the non-dominant limb. A fatigue protocol was performed to reduce the maximum height jumped by 60-80%. Another eight maximum trials were performed fatigued. Ground reaction forces and video data were collected and analysed. Paired T-tests were performed on the kinetic data. Peak loading rates were also given. Root mean squared deviations were calculated and maximum and minimum values were produced for the kinematic results. The results showed that one subject’s peak VGRF, time to peak VGRF and time on ground results were significantly different (p<0.05). The maximum height was typically significantly different (p<0.05) for all subjects between conditions for both the dominant and non-dominant limbs at take-off. One subject was found to produce significantly different total peak VGRFs during the landing phase, however there was also a substantial decrease in all subjects peak VGRFs using the dominant and non-dominant limb. The angular displacement and velocity data produced similar curve patterns in both of the conditions. There were certain joints which altered more when fatigued, these being the hip and knee, which may try to compensate for the load and forces being applied to the joints. Injuries could occur if the load or forces become too great for the joints to dissipate whilst fatigued therefore putting strain upon the body. Overall there was a reduction in the maximum height jumped during the fatigued state, which suggests there is an affect upon performance with this acute bout of fatigue and therefore form the assumption that injuries can occur when fatigued compared to unfatigued.
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