The Claim
A single resistance training session to failure with low-load back-squats causes an immediate 25–32% reduction in countermovement jump height in resistance-trained men, with a persistent reduction of 6.7–7.9% at 24 and 48 hours post-exercise.
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.
After performing low-load back squats to failure, resistance-trained men experience an immediate 25–32% drop in jump height, and this reduction remains at 6.7–7.9% for up to 48 hours.
See the scientific wording
After a single resistance training session to failure with low-load back-squats, countermovement jump height decreases by 25–32% immediately post-exercise and remains reduced by 6.7–7.9% at 24 and 48 hours later in resistance-trained men, indicating prolonged neuromuscular fatigue.
Heavy squats to failure drain muscle energy, build up waste chemicals, and disrupt how muscles respond to nerve signals. This makes the muscles weaker right away, and the waste chemicals stick around for days, keeping the nerves from fully turning the muscles back on.
What the research says
1 studyAfter doing a tough set of squats until exhaustion, the study found that guys couldn't jump as high right after — and even two days later, their jumps were still weaker. This means their muscles and nerves took a long time to bounce back.
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.