Personer med bra gener för muskeltillväxt förlorar också muskelmassa snabbare

[King Grub]

Introduction:

It is well known that the same heavy strength training program may lead to rather large individual adaptations both in maximal strength and muscle hypertrophy. These individual adaptations may often be divided into different subgroups. The purpose of this study was to investigate how these different responder subgroups in muscle hypertrophy during strength training would behave during detraining following the training period.

Methods:

The present study included ten weeks of progressive hypertrophic strength training followed by six weeks of detraining. 24 male subjects (age 24.6±3.8 yrs, height 180.7±7.3 cm, weight 77.0±10 kg) were measured for Vastus lateralis (VL) cross-sectional area (CSA) (B-mode axial-plane ultrasound) and maximal bilateral concentric 1RM in the horizontal leg press.

Results:

VLCSA increased in the total group from 31.1±5.7cm to 35.1±5.0cm and leg press 1RM from 154.6±24.9kg to 178.5k±25kg after ten weeks of strength training. The subjects were split to three groups according to the increase in VLCSA: High responders >15% (n=10), Medium responders 15-5% (n=6) and Low responders <5% (n=8). High responders were the only ones to have a significant change in VLCSA from pre to mid, pre to post-training, pre to detraining 1, pre to detraining 2 and post-training to detraining 2. VLCSA increased in High responders by +22.3% ±7.0 during training and decreased by -9.3%±5.7 during detraining and 1RM by +20.5±12.5% and -2.1±3.1%, respectively. The corresponding values for Medium responders were +8.7±6.0% and -4.7±3.3% for VLCSA, and +14.1±11.3% and -1.9±4.3% for 1RM, and for Low responders -2.3±5.9% and -0.5±8.4% for VLCSA and +12.6±11.5% and +0.1.9±3.4 for 1RM, respectively.

Conclusions:

Our results indicate that High responders in muscle CSA tend to lose VLCSA and dynamic bilateral strength somewhat faster than Non responders during the detraining phase. The results highlight the need of individual tapering and detraining programs for maximum development in hypertrophy and maximal strength in the long term.

High responders to strength training tend to lose more muscle mass and strength during the detraining phase than low responders. 19th International Symposium “Modern Science and Practice for Strength and Endurance Training” October 10-12, 2018.

https://www.jyu.fi/sport/en/research...low-responders