See, stats, and : https : / / www . researchgate . net / publication / 5987293 Changes activity - specific Article DOI : 10 . 1080 / 02640410701352018 : PubMed CITATIONS 73 READS 558 3 : Some : Longitudinal athletes Energy Jon Cardiff 88 , 515 SEE Neil University 382 , 605 SEE Craig University 237 , 645 SEE All . The . Abstract The jump performance of ten youth soccer players (mean age 15 . 8 years , s ¼ 0 . 4) was assessed before and after 42 min of soccer - specific exercise performed on a non - motorized treadmill . A squat , countermovement , and drop jump were performed on a force platform and simultaneously surface EMG activity of four lower limb muscles was collected . Jump height deteriorated across all conditions with mean reductions of 71 . 4 cm (s ¼ 1 . 6 ; P 5 0 . 05) , 73 . 0 cm (s ¼ 2 . 9 ; P 5 0 . 05) , and 72 . 3 cm (s ¼ 1 . 7 ; P 5 0 . 01) in the squat , countermovement , and drop jump respectively . The impact force in the drop jump was the only force variable to show a significant change with fatigue (P 5 0 . 05) . Following the prolonged exercise , reductions in total muscle activity were non - significant for the squat jump , approached significance for the counter - movement jump (P ¼ 0 . 07) , and achieved significance for the drop jump (P 5 0 . 05) . The results showed that completing soccer - specific exercise reduced performance in all jump tasks . Reductions in muscle activity were greatest for the drop jump , suggesting an influence of muscle stretch and loading on reduced muscle activity when fatigued .
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