Vertical ground reaction force supports brief sprinting in female soccer players
Bibliographic record
Abstract
This study examined vertical ground reaction forces and their association towards supporting brief and prolonged musculoskeletal performance in female adolescent soccer players. Twenty female soccer players with an age of 19.6 ± 1.3 (y), including 3-goal keepers, 9-defenders, 4-mid-fielders, and 4-forwards, were examined once per month over a three-month period. Vertical ground reaction forces were derived from the stretch-shortening cycle during a counter movement jump on a dual force plate system to calculate peak braking force (N), force at minimum displacement (N) and peak propulsive force (N). Brief muscular performance was examined using jump height (cm) and 5 m and 10 m sprint time (s). Prolonged muscular performance was assessed using 25 m sprint time (s) and the YoYo IRTL-l test (m). Linear regression analysis was used to examine the association between vertical ground reaction forces and muscular performance measures. In all, 5 m sprint time displayed significant associations with peak propulsive force (r = −0.47, P = 0.000), force at minimum displacement (r = −0.40, P = 0.004) and peak breaking force (r = −0.40, P = 0.005). A significant association was observed between 10 m sprint time and peak propulsive force (r = −0.39, P = 0.005), force at minimum displacement (r = −0.35, P = 0.012), and peak breaking force (r = −0.36, P = 0.010). Indices of prolonged muscular performance were not significantly associated with vertical ground reaction forces. Vertical ground reaction forces support 5 m and 10 m sprint speed in adolescent female soccer players. Cette étude a permis d’examiner les forces de réaction verticales au sol et leur association aux performances musculosquelettiques brèves et prolongées chez des joueuses de football adolescentes. Vingt joueuses de football âgées de 19,6 ± 1,3 (ans), dont 3 gardiennes de but, 9 défenseures, 4 milieux de terrain et 4 attaquantes, ont été examinées une fois par mois sur une période de trois mois. Les forces de réaction verticales au sol ont été dérivées du cycle d’étirement-raccourcissement lors d’un saut à contre-mouvement sur un système à double plateformes de force pour calculer la force de freinage maximale (N), la force au déplacement minimum (N) et la force de propulsion maximale (N). De brèves performances musculaires ont été examinées en utilisant la hauteur de saut (cm) et le temps (s) de sprint de 5 m et 10 m. Les performances musculaires prolongées ont été évaluées à l’aide d’un temps de sprint de 25 m (s) et du test YoYo IRTL-l (m). Une analyse de régression linéaire a été utilisée pour examiner l’association entre les forces de réaction verticales au sol et les mesures de performance musculaire. Le temps de sprint sur 5 m a montré des associations significatives avec la force de propulsion maximale (r = −0,47, p = 0,000), la force au déplacement minimum (r = −0,40, p = 0,004) et la force de rupture maximale (r = −0,40, p = 0,005). Une association significative a été observée entre le temps de sprint sur 10 m et la force de propulsion maximale (r = −0,39, p = 0,005), la force au déplacement minimum (r = −0,35, p = 0,012), et la force de rupture maximale (r = −0,36, p = 0,010). Les indices de performance musculaire prolongée n’étaient pas significativement associés aux forces de réaction verticales du sol. Les forces de réaction verticales au sol sont associées aux vitesses de sprint sur 5 m et 10 m chez les adolescentes footballeuses.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".