The Study
Muscle time under tension during resistance exercise stimulates differential muscle protein sub‐fractional synthetic responses in men
This study showed that when guys lifted weights slowly, their muscles made more protein right after — but only for a few hours. It doesn't prove that slow lifting makes you bigger muscles over time, just that something inside the muscle changed right after exercise.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
When you lift light weights slowly until you're exhausted, your muscles make more of the proteins that help them grow — but not right away. The biggest growth signals happen the next day.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 553 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — this means slow, controlled lifting to failure may be more effective than fast lifting for building muscle over time, even with light weights.
- 2Slow lifts (6s up, 6s down) made muscle protein synthesis go up 2.3x the next day, while fast lifts (1s/1s) didn't.
- 3Slow lifts also boosted mitochondrial and sarcoplasmic protein synthesis by 114% and 77% within 6 hours.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
The Journal of Physiology
Year
2012
Authors
N. Burd, Richard Andrews, Daniel W D West, J. Little, A. J. Cochran, Amy J. Hector, Joshua G. A. Cashaback, M. Gibala, J. Potvin, S. Baker, Stuart M Phillips
Related Content
Claims (6)
When resistance training is performed closer to muscular failure, muscle growth is greater due to higher total workload and longer duration of muscle contraction during each set.
In young men trained in resistance exercise, performing low-load lifts with a slow 6-second contraction and 6-second relaxation increases phosphorylation of the p70S6K protein at 24 hours after exercise, and this increase is statistically associated with a delay in the rate of myofibrillar protein synthesis.
In young men who regularly lift weights, performing resistance exercises slowly increases mitochondrial protein synthesis by 175% and performing them quickly increases it by 126% during the 24 to 30 hours after exercise.
In young men trained in resistance exercise, performing knee extensions with a slow movement pattern to muscle failure results in a 2.3-fold higher rate of myofibrillar protein synthesis during the 24 to 30 hours after exercise compared to performing the same exercise with a fast movement pattern, and longer muscle tension during the exercise leads to a stronger protein synthesis response following protein intake.
In young men trained in resistance exercise, performing lifts with a slow tempo (6 seconds up, 6 seconds down) increases mitochondrial protein synthesis by 114% compared to rest within the first 6 hours after exercise, while fast tempo lifts do not produce this increase.
In young men trained with resistance exercise, performing lifts slowly with six seconds up and six seconds down increases the production of non-contractile muscle proteins by 77% compared to rest within the first six hours after exercise, while performing lifts quickly does not produce this increase.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.