On the relationship between external and internal load variables in elite youth soccer players.

ABSTRACT: The study investigated the relationship between external and internal training load measures in 25 male elite youth soccer players (age: 16.6 ± 0.9 years, VO_2max: 59 ± 4 ml/min/kg) over 3 months. External load (i.e., total distance, high metabolic power distance, high-speed running) was quantified using a local positioning system and related to subjective (RPE, sleep quality, drive (energy level)), biochemical (creatine kinase (CK), lactate dehydrogenase (LDH), C-reactive protein (CRP), urea, cortisol, transferrin), and neuromuscular (CMJ) markers. Single day workload (1DL), exponential 7-day workload (7DL), and the acute: chronic workload ratio (ACWR) were calculated. 1DL parameters were correlated (Spearman's rho) with RPE (range r = 0.24 to 0.43, p < 0.01) and 1DL distance wa

SUBMITTER: Haller N 

PROVIDER: S-EPMC12827287 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature