Whether you lift heavy or light weights, your performance on machines that move at a fixed speed doesn't improve more with heavier loads, because the movement pattern matters more than the weight.
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.
Definitive consensus on whether resistance training load influences isokinetic strength across all populations and testing velocities.
A systematic review and meta-analysis of 50+ RCTs comparing >60% 1-RM vs. ≤60% 1-RM training in adults, measuring isokinetic strength at multiple angular velocities (60°, 120°, 180°, 240°/s) as primary outcomes, with volume and effort equated, and stratification by age and training status.
Causal evidence that load does not influence isokinetic strength gains when other variables are controlled.
A double-blind RCT with 120 healthy adults (60 per group), aged 20–40, randomized to 80% 1-RM (3×8) or 30% 1-RM (3×25) for 12 weeks, with volume equated and training to failure, measuring isokinetic knee extension strength at 60°, 120°, and 180°/s as primary outcomes.
Long-term association between habitual training load and isokinetic strength in real-world settings.
A prospective cohort study following 500+ athletes and rehab patients over 3 years, tracking their resistance training load and frequency, with annual isokinetic strength testing at multiple velocities.
Whether individuals with high isokinetic strength gains are more likely to have trained with higher loads.
A case-control study comparing 80 individuals with >15% isokinetic strength gain to 80 with <5% gain over 12 weeks, matching for baseline strength and training history, and analyzing their training load history via logs.
A snapshot association between current training load and current isokinetic strength.
A cross-sectional survey of 1000 athletes and rehab patients measuring their current training load (%1-RM) and isokinetic knee extension strength at 120°/s.