Health · Fitness & Nutrition · 9 hrs ago
Muscle and liver cells may retain benefits of past exercise
Researchers say muscle and liver cells can retain signs of past exercise even after someone stops training.
In studies using mice, animals that exercised, took a break and trained again grew larger muscles than mice with no training history.
Their muscle cells also matched energy production to demand more effectively, and this ability remained during inactivity.
The researchers say liver cells also store exercise memories and release enzymes that help supply fuel to working muscles.
These findings may help explain why people who return to exercise can regain fitness faster than those starting without a training history.
Exercise benefits such as fitness and insulin sensitivity can still decline during a break, so the findings do not mean that regular activity is unnecessary.
The research suggests that returning to exercise may build on some lasting cellular effects of earlier training.
Muscle and liver cells may retain memories of past exercise, according to research described by exercise physiologists.
In mice, muscles that had been trained before grew larger when training resumed than muscles with no training history.
The researchers say trained muscle cells retained an improved ability to match energy production to demand, even without further exercise.
The findings also indicate that liver cells may store exercise memory and help supply fuel to working muscles.
The research challenges the idea that all benefits of exercise disappear when training stops.
- Who
- Exercise physiologists and their research team studied how cells remember exercise.
- What
- The researchers found that muscle and liver cells may retain memories of past training.
- When
- The articles were published on October 10 and October 12, 2026.
- Where
- The research described includes studies in mice and people; the location is not stated.
- Why
- The researchers investigated whether cells retain a record of training that could affect the body's response when exercise resumes.
Traditional view of exercise adaptation
Exercise-memory research
Effects of a break
Traditional view of exercise adaptation
Muscle gains and insulin sensitivity can drift back toward their starting levels, often within weeks.
Exercise-memory research
Cells may retain memories of earlier training during a period without exercise.
Regaining fitness
Traditional view of exercise adaptation
The traditional “use it or lose it” view implies that benefits fade when training stops.
Exercise-memory research
People with a training history may get fit again faster, and previously trained mice grew bigger muscles when they retrained.
At the cellular level, you probably weren’t.
We found that muscle and liver cells store memories from every training session in ways that may help improve endurance, control blood sugar levels and even slow weight regain after inactivity.
In the mouse protocol, the researchers trained mice for four to eight weeks.
The mice then had a period with no exercise.
The researchers trained the mice again to examine how cells recalled earlier exercise.
- Mouse training period
- Four to eight weeks
- Exercise protocol
- ON-OFF-ON
- Muscle response
- Retrained mice grew bigger muscles than mice with no training history
- Cell response
- Retrained muscle better matched energy production to demand
- Liver response
- Liver cells released higher levels of carboxylesterases in trained, detrained and retrained mice and people
Sources
Related news
Creatine may support muscle performance when combined with resistance training
Chef Ivan Barros shares a chicken and lentil bowl with 66 grams of protein
Vibration plates may support exercise, but evidence is mixed
Study questions claims that heel striking and cadence increase running injury risk
Dietitians say protein powder is optional and recommend checking labels
Dermatologist lists five signs that may point to scalp problems
Gut microbes may influence stress, hormones and sex drive
Protein powder and meal replacement powder serve different purposes
Hip Flexor Strength May Support Running Form and Endurance
Late-night eating linked to higher risk of fatty liver disease
Segment examines viral claims about living longer
