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PeerJ. 2019 Aug 13;7:e7466. doi: 10.7717/peerj.7466. eCollection 2019.

The effects of detraining and retraining periods on fat-mass and fat-free mass in elite male soccer players.

Author information

1
Department of Sport and Informatics, Section of Physical Education and Sport, Pablo de Olavide University, Sevilla, Spain.
2
Performance Department, FC Basel 1893, Basel, Switzerland.
3
Football Science Department, Pablo de Olavide University, Sevilla, Spain.
4
Sports Science Department, FC Girondins de Bordeaux, Bordeaux, France.
5
Universidad de Sevilla, Sevilla, Spain.
6
The College of Healthcare Sciences, James Cook University, Townsville, Australia.
7
Associate Graduate Program in Physical Education UPE/UFPB, João Pessoa, PB, Brazil.
8
Football Performance & Science Department, Aspire Academy, Doha, Qatar.
9
Department of Movement, Human and Health Sciences, University of Rome "Foro Italico", Rome, Italy.

Abstract

The aim of the study was to examine the effects of a detraining period (DTP) (i.e., off-season) with an individually prescribed training program, and a retraining period (RTP) (i.e., pre-season) combining soccer and flywheel-based strength training on fat-free mass (FFM) and fat-mass (FM) in 10 elite professional male soccer players. The present study used a controlled repeated-measures research design to investigate the changes in FFM and FM using dual-energy X-ray absorptiometry. Whole body %FM increased (effect size (ES) = 0.87 ± 0.46) and FFM reduced after DTP (ES = -0.30 ± 0.19), returning to values comparable to the end of the previous season after RTP. At regional levels, arms, legs, and trunk %FM increased (ES = from 0.42 to 1.29) while trunk-FFM was reduced (ES = -0.40 ± 0.26) after DTP, returning to the values observed at the end of the previous season after RTP. Legs-FFM did not change after DTP, with a substantial increase after RTP in comparison with pre-season values (ES = 0.34 ± 0.29 and 0.53 ± 0.36 for the right and left leg, respectively). Despite the small sample size of the present study, the findings indicate that elite soccer players can be allowed 2 weeks of rest during a five-week DTP, since the changes in %FM and FFM were relatively small, and FM and FFM returned to the optimal initial values for competition after the proposed RTP during the pre-season.

KEYWORDS:

Football; Inertial devices; Neuromuscular training; Power

Conflict of interest statement

Luis Suarez-Arrones and Nacho Torreno are employees of FC Basel, Rafael Maldonado is an employee of FC Girondins de Bourdeaux. The authors declare there are no competing interests.

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