Lifting very heavy weights until you can't do another rep actually makes your muscles slower at generating quick bursts of force, even if you get stronger overall. This finding is from the abstract summary - full study details were not available.
Claim Context
High-intensity resistance training performed to failure at 80% of a one-repetition maximum significantly decreases both early and peak rate of force development in trained males over a 10-week period, regardless of whether one, four, or eight sets are performed per session. This neuromuscular adaptation indicates that heavy loading combined with failure may temporarily impair rapid force production capabilities.
“Early (30, 50 ms) and peak RFD was significantly decreased for all groups after 6 and 10-weeks of training (P < 0.05).”
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
A systematic review would aggregate data from multiple trials to determine the consistent effect of failure-based training on rate of force development across different populations and exercise modalities.
A systematic review and meta-analysis of randomized trials examining the impact of training to failure versus non-failure training on RFD metrics in resistance-trained individuals over 8+ weeks.
A controlled trial could isolate the effect of training to failure on RFD by comparing it to matched volume training stopped short of failure, establishing a direct causal link.
A double-blind RCT with 60 trained males randomized to either 80% 1-RM squats to failure or matched volume squats at RPE 8, measuring RFD via force plates at 30, 50 ms and peak intervals at baseline, 6, and 10 weeks.
A case-control study could compare athletes with high RFD who train to failure against those with low RFD to identify historical training patterns associated with power deficits.
A case-control study matching 30 power athletes with high RFD to 30 with low RFD, retrospectively assessing their training history for frequency of training to failure and volume over the past 2 years.