Monitoring training load in youth soccer players: effects of a six-week preparatory training program and the associations between external and internal loads

Autor: Sandra Lechner, Achraf Ammar, Omar Boukhris, Khaled Trabelsi, Jordan M Glenn, Jesper Schwarz, Omar Hammouda, Piotr Zmijewski, Hamdi Chtourou, Tarak Driss, Anita Hoekelmann
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Biology of Sport, Vol 40, Iss 1, Pp 63-75 (2022)
Druh dokumentu: article
ISSN: 0860-021X
2083-1862
DOI: 10.5114/biolsport.2023.112094
Popis: Thisstudy examined the effects of a six-week preparatory training program on physical performance and physiological adaptations in junior soccer players. Additionally, we investigated whether a relationship existed between external and internal loads. Youth soccer players (aged 16 years old) from a youth football academy participated in six weeks of pre-conditioning training. Wireless Polar Team Pro and Polar heart rate sensors (H10) were used to monitor physical performance indicators (sprint and acceleration scores, covered distance, maximum and average speed and duration), physiological responses (maximum and average heart rate [HR] and R-R interval, time in HR zones 4+5, and heart rate variability [HRV]), and training load score. Additionally, muscle status and rating of perceived exertion (RPE) scores were measured using digital questionnaires. Significant increases were observed in the majority of physical performance indicators [i.e., sprints (p = 0.015, ES = 1.02), acceleration (p = 0.014, ES = 1), total distance (p = 0.02, ES = 0.87), as well as maximum speed (p = 0.02, ES = 0.87)]. A trend towards improvement was observed in the remaining performance indicators (i.e., distance/min and avg speed; ES = 0.6), training load (ES = 0.2), muscle status (ES = 0.3)), and all physiological responses parameters (ES = 0.1 to 0.6). Significant correlations were found between the majority of external load parameters (i.e., performance indicators) and objective (i.e., physiological responses) and subjective (i.e., RPE, muscle status) internal load parameters (p
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