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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
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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, dbehm@mun.ca.

Copyright © 2019 by the National Strength & Conditioning Association.