The Claim
In resistance-trained men, a 2-second eccentric phase combined with a 1-second concentric phase (protocol B) is associated with the highest post-exercise increases in IGF-1, testosterone, and insulin compared to other tempo protocols.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
For guys who lift weights, doing the lowering part of a lift slowly (2 seconds) and the lifting part quickly (1 second) might boost certain hormones more than other lifting speeds.
See the scientific wording
In resistance-trained men, a 2-second eccentric phase combined with a 1-second concentric phase (protocol B) is associated with the highest post-exercise increases in IGF-1, testosterone, and insulin compared to other tempo protocols.
What the research says
1 studyStudy: Impact of differing eccentric-concentric phase durations on muscle damage and anabolic hormones
The study tested lifting weights slowly on the way down (2 seconds) and quickly on the way up (1 second), and found that this exact method made the body produce more of the hormones that help muscles grow, more than other lifting speeds did.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.