Can muscles grow without working hard or getting sore?
Experimental chronic low‐frequency resistance training produces skeletal muscle hypertrophy in the absence of muscle damage and metabolic stress markers
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Muscle mass increased by 12% while inflammation (TNF-α) decreased by 24% and markers of damage (CK) and metabolic stress (lactate) remained unchanged.
Common fitness wisdom says muscle growth requires micro-tears and inflammation—this study shows growth can occur without either.
Practical Takeaways
Try a low-frequency resistance routine—e.g., two light sessions per week with moderate reps—to potentially build muscle without soreness or fatigue.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Muscle mass increased by 12% while inflammation (TNF-α) decreased by 24% and markers of damage (CK) and metabolic stress (lactate) remained unchanged.
Common fitness wisdom says muscle growth requires micro-tears and inflammation—this study shows growth can occur without either.
Practical Takeaways
Try a low-frequency resistance routine—e.g., two light sessions per week with moderate reps—to potentially build muscle without soreness or fatigue.
Publication
Journal
Cell Biochemistry and Function
Year
2010
Authors
N. Zanchi, F. Lira, M. Seelaender, Antônio Herbert Lancha-Jr
Related Content
Claims (7)
Scientists aren't sure if the burning feeling you get during a tough workout (called metabolic stress) actually helps your muscles grow, because it's always happening at the same time as the physical pulling on muscles—and we can't separate the two in people.
When rats do light weight training twice a week for three months, their calf muscles get about 12% bigger—even though they’re not lifting heavy weights—so maybe you don’t need to lift heavy to build muscle.
When rats do low-frequency strength exercises, their calf muscle produces less of a protein that causes swelling and inflammation—so maybe this kind of exercise helps calm down muscle irritation.
When rats do low-frequency weightlifting, their blood doesn't show signs of muscle soreness or energy stress, meaning this kind of exercise doesn't hurt or tire their muscles.
When rats do low-intensity weight exercises, their calf muscle produces less of a protein that causes inflammation, and it doesn’t hurt their muscles — so it might help calm down inflammation naturally.