May 24, 2015
If you train intensively for a certain period and then pause for some reason, you will gradually lose the muscle you have built up. Many people then have trouble starting training again because they know how hard the journey to a dream body was. But there is good news: When you start training again, you can quickly regain all muscles and strength through the muscle memory effect.
When you engage in strength training, your body stores Myonuclei in your muscle cells, crucial for muscle growth. These Myonuclei remain even when you take a break from training.
In practical terms, this means that when you resume training, your body requires significantly less time to regain your previous level of fitness. The existing Myonuclei facilitate the process of muscle building, allowing you to get back in shape more quickly. This is a huge advantage and should offer encouragement to anyone considering a return to training after a hiatus. The Muscle Memory Effect serves as a kind of safety net, enabling you to more rapidly pick up where you left off..
Scientific Articles and Studies
Muscle memory and a new cellular model for muscle atrophy and hypertrophy
https://jeb.biologists.org/content/219/2/235
Muscle memory discovery ends ‘use it or lose it’ dogma
https://blog.frontiersin.org/2019/01/28/scientists-locate-muscle-memory/
Skeletal Muscles Do Not Undergo Apoptosis During Either Atrophy or Programmed Cell Death-Revisiting the Myonuclear Domain Hypothesis
https://www.frontiersin.org/articles/10.3389/fphys.2018.01887/full
Elevated myonuclear density during skeletal muscle hypertrophy in response to training is reversed during detraining
https://www.physiology.org/doi/abs/10.1152/ajpcell.00050.2019
Closing Words
So a few weeks or months of training break are not a problem, as you can quickly get back to your old level through muscle memory. If you also adjust your diet to the break (e.g. lots of protein and maintenance calories), you will also lose less muscle mass.