المحترف
Volume 12, Numéro 4, Pages 433-455
2025-12-01
Monitoring Endurance Adaptations Through Critical Speed And Work Capacity (d′) In Youth Amateur Football Athletes
Authors : Guermat Mohamed Dayaa Eddine . Hadji Abderrahmen . Kabes Ahmed .
Abstract
This study examines athletic performance using two physiological markers: critical speed (CS) and critical power (CP), which describe the relationship between exercise intensity and duration—particularly pertinent to non-cyclic sports such as football. Twenty amateur male football players (age: 18 years) participated in three testing sessions over a three-month period. Each session involved time-trial runs of 3, 6, and 12 minutes. For each trial, distance covered, and end-exercise heart rate were recorded. CS, and the work capacity above CS (D′) were estimated using three modeling approaches: linear, hyperbolic, and inverse-time (1/time) models. The estimated CS values did not differ significantly between models, suggesting consistency across mathematical approaches. Notably, CS increased significantly over the three sessions (p < 0.001), indicating improved aerobic fitness over time. In contrast, D′ exhibited a decreasing trend, reaching statistical significance in the hyperbolic model. This reduction may reflect diminished tolerance to high-intensity efforts despite improved aerobic capacity. These findings support the utility of CS as a stable and sensitive marker of endurance performance, while highlighting the greater variability and possible context-dependence of D′.
Keywords
Endurance Adaptations ; critical speed ; Work capacity (D’)
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