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Global Training Effects of Trained and Untrained Muscles With Youth Can be Maintained During 4 Weeks of Detraining

Chaouachi, Anis1,2; Ben Othman, Aymen1; Makhlouf, Issam1; Young, James D.3; Granacher, Urs4; Behm, David G.3

The Journal of Strength & Conditioning Research: October 2019 - Volume 33 - Issue 10 - p 2788–2800
doi: 10.1519/JSC.0000000000002606
Original Research

Chaouachi, A, Ben Othman, A, Makhlouf, I, Young, JD, Granacher, U, and Behm, DG. Global training effects of trained and untrained muscles with youth can be maintained during 4 weeks of detraining. J Strength Cond Res 33(10): 2788–2800, 2019—Global (whole-body) effects of resistance training (i.e., cross-education) may be pervasive with children. Detraining induces less substantial deficits with children than adults. It was the objective of this study to investigate the global responses to 4 weeks of detraining after 8 weeks of unilateral leg press (LP) training in 10–13-year-old, pre-peak-height-velocity stage boys. Subjects were randomly separated into 2 unilateral resistance training groups (high load/low repetitions [HL-LR] and low load/high repetitions [LL-HR], and control group). Assessments at pre-training, post-training, and detraining included dominant and nondominant limbs, unilateral, 1 repetition maximum (1RM) and 60% 1RM LP, knee extension, knee flexion, elbow flexion, and handgrip maximal voluntary isometric contraction (MVIC), and countermovement jump (CMJ). All measures significantly increased from pre-test to detraining for both training programs, except for elbow flexion MVIC with increases only with HL-LR. All measures except CMJ and handgrip MVIC significantly decreased from post-test to detraining, except for elbow flexion MVIC with decreases only with HL-LR. The dominant trained limb experienced significantly greater LP improvements (pre- to detraining) and decrements (post- to detraining) with LP 1RM and 60% 1RM LP. In conclusion, youth HL-LR and LL-HR global training effects of trained and untrained limbs demonstrate similar benefits (pre- to detraining) and decrements (post- to detraining) with detraining. The findings emphasize that training any muscle group in a child can have positive global implications for improved strength and power that can persist over baseline measures for at least a month.

1Tunisian Research Laboratory “Sport Performance Optimisation,” National Center of Medicine and Science in Sports (CNMSS), Tunis, Tunisia;

2Sports Performance Research Institute New Zealand, AUT University, Auckland, New Zealand;

3School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, Newfoundland, Canada; and

4Division of Training and Movement Science, University of Potsdam, Potsdam, Germany

Address correspondence to Dr. David G. Behm,

Copyright © 2019 by the National Strength & Conditioning Association.