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As per the podcast title, this article looks into the effects of detaining (strength) on power athletes.  This is an important concept to get right with respect to peaking for athletes.

 

Med Sci Sports Exerc. 1993 Aug; 25(8):929-35.

https://europepmc.org/abstract/med/8371654

 

The effects of detraining on power athletes.

Hortobágyi T, Houmard JA, Stevenson JR, Fraser DD, Johns RA, Israel RG

 

Abstract

 

We investigated the effects of 14 d of resistive exercise detraining on 12 power athletes.

 

In comparing performances pre- to post-detraining, there were no significant (P > 0.05) changes in free weight bench press (-1.7%), parallel squat (-0.9%), isometric (-7%) and isokinetic concentric knee extension force (-2.3%), and vertical jumping (1.2%). In contrast, isokinetic eccentric knee extension force decreased in every subject (-12%, P < 0.05). Post-detraining, the changes in surface EMG activity of the vastus lateralis during isometric, and isokinetic eccentric and concentric knee extension were -8.4%, -10.1%, and -12.7%, respectively (all P > 0.05). No significant changes occurred in knee flexion forces or EMGs (P > 0.05). Percentages of muscle fiber types and the Type I fiber area remained unchanged, but Type II fiber area decreased significantly by -6.4% (P < 0.05). Levels of plasma growth hormone (58.3%), testosterone (19.2%), and the testosterone to cortisol ratio (67.6%) increased, whereas plasma cortisol (-21.5%) and creatine kinase enzyme levels (-82.3%) decreased (all P < 0.05).

 

Short-term resistive exercise detraining may thus specifically affect eccentric strength or the size of the Type II muscle fibers, leaving other aspects of neuromuscular performance uninfluenced. Changes in the hormonal milieu during detraining may be conducive to an enhanced anabolic process, but such changes may not materialize at the tissue level in the absence of the overload training stimulus.

 

PMID: 8371654

 

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