The Claim
In heavy resistance-trained male youth rugby players, higher-volume hypertrophy training using loads of 35–70% 1RM is associated with greater acute declines in 20 m sprint performance (−2.1 ± 4.3%; ES = 0.7) and agility performance (−1.1 ± 4.2%; ES = 0.6) at 24–48 hours post-training compared to maximal strength training using loads of 70–100% 1RM, indicating larger short-term impairments in field-specific performance following hypertrophy-focused 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 young male rugby players who lift weights, doing high-rep, lighter weight workouts seems to slow them down and make them less agile for a day or two more than doing low-rep, heavy weight workouts.
See the scientific wording
In heavy resistance-trained male youth rugby players, higher-volume hypertrophy training (35–70% 1RM) is associated with larger declines in 20 m sprint performance (−2.1 ± 4.3%; ES = 0.7) and agility performance (−1.1 ± 4.2%; ES = 0.6) at 24–48 hours post-training compared to maximal strength training (70–100% 1RM), suggesting greater acute impairment in field-specific performance.
What the research says
1 studyThe study found that when young rugby players switched to a higher-rep, lower-weight workout, they were slower and less agile the next day compared to when they did heavy strength training, which supports the claim.
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.