The Influence of Soccer-specific Metrics on The Interindividual Variance in Response to Plyometric Training on Jump Performance in Elite Youth Soccer Players
Authors
Wisler, Mikkel ; Schubert, Joey
Term
4. semester
Education
Publication year
2024
Submitted on
2024-05-30
Abstract
This study examined whether weekly soccer-specific workload metrics (time played, running distance, high-speed running, and sprint count) and self-reported readiness and exertion (RPE) account for individual differences in training response in reactive strength index (RSI) and countermovement jump (CMJ) among elite U15 players during the in-season. Twelve players from AaB Academy completed an eight-week, low-volume, high-intensity plyometric program added to regular training, including exercises such as drop jump, CMJ, and squat jump. RSI and CMJ were assessed at three time points (T0 prior to the intervention period, T1 immediately before the intervention, and T2 after the intervention). GPS-derived match and training data were collected and, together with readiness and RPE, entered into multiple regression analyses. Changes in performance were also evaluated with repeated-measures ANOVA, and the correlation between changes in RSI and CMJ was tested. The regression models showed no significant associations between soccer-specific metrics, readiness, or RPE and changes in RSI or CMJ. In contrast, the intervention produced significant mean improvements in both RSI and CMJ from T1 to T2. Changes in RSI and CMJ did not correlate significantly, suggesting that the same plyometric program can elicit different adaptations across individuals. Overall, the findings indicate that variation in weekly match and training load did not explain interindividual response differences, even though average jump performance improved.
Dette studie undersøgte, om ugentlige fodboldspecifikke belastningsmål (spilletid, løbedistance, højhastighedsløb og antal sprinter) samt selvrapporteret readiness og anstrengelse (RPE) kan forklare individuelle forskelle i træningsrespons på reaktivt styrkeindeks (RSI) og countermovement jump (CMJ) hos elite U15-spillere i sæsonen. Tolv spillere fra AaB Academy gennemførte en otte ugers, lav-volumen, høj-intensitet plyometrisk intervention som supplement til deres normale træning, med øvelser som drop jump, CMJ og squat jump. RSI og CMJ blev testet på tre tidspunkter (T0 før interventionsperioden, T1 lige før interventionen og T2 efter interventionen). GPS-baserede kamp- og træningsdata blev indsamlet, og sammen med readiness og RPE indgik de i multiple regressionsanalyser. Derudover blev ændringer i præstation vurderet med gentagne målings-ANOVA og korrelation mellem ændringer i RSI og CMJ undersøgt. De multiple regressionsmodeller fandt ingen signifikant sammenhæng mellem fodboldspecifikke metrics, readiness eller RPE og ændringer i RSI eller CMJ. Interventionen gav derimod signifikante forbedringer i gennemsnitlig RSI og CMJ fra T1 til T2. Ændringer i RSI og CMJ korrelerede ikke signifikant, hvilket tyder på, at det samme plyometriske program kan give forskellige tilpasninger hos den enkelte. Samlet peger resultaterne på, at variationen i ugentlig kamp- og træningsbelastning ikke forklarede de interindividuelle forskelle i respons, selvom den gennemsnitlige springpræstation blev forbedret.
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Keywords