High intensities (70%-85% 1RM) consistently optimized strength and hypertrophy, while velocity loss modulates outcomes: greater velocity loss (50%) maximized muscle growth and endurance, while moderate velocity loss (25%) produced superior maximal strength gains.
Key Findings
Results
Higher relative intensity (70%-85% 1RM) produced the greatest gains in cross-sectional area, 1RM strength, velocity against submaximal loads, and maximum number of repetitions compared to lower intensity groups.
158 resistance-trained men were randomly assigned to 12 groups after an 8-week bench press training program
Three intensity ranges were tested: 40%-55% 1RM, 55%-70% 1RM, and 70%-85% 1RM
Significant 'intensity × time' interactions were observed for CSA, 1RM, velocity attained against submaximal loads, and MNR
The 70%-85% 1RM group produced the greatest gains across all measured outcomes
Results
A velocity loss threshold of 50% per set yielded the highest increases in cross-sectional area (muscle hypertrophy) and maximum number of repetitions.
Four velocity loss thresholds were tested: 0%, 15%, 25%, and 50%
Significant 'VL × time' interactions were found for CSA, 1RM, and MNR
VL50 (50% velocity loss) produced the greatest improvements in pectoralis major cross-sectional area and maximum number of repetitions
Higher velocity loss thresholds allow more repetitions per set, which may drive greater metabolic and mechanical stimulus for hypertrophy
Results
A velocity loss threshold of 25% per set resulted in the greatest improvements in maximal strength (1RM).
VL25 (25% velocity loss) produced superior maximal strength gains compared to both lower (0%, 15%) and higher (50%) velocity loss thresholds
Significant 'VL × time' interactions were found for 1RM
This finding supports the hypothesis that a moderate velocity loss threshold optimizes maximal strength development
The pre-specified hypothesis that high intensity (70%-85% 1RM) with moderate VL (25%) would maximize strength gains was confirmed
Results
Significant intensity × time interactions were observed for multiple performance outcomes, confirming that relative load intensity independently modulates training adaptations.
Outcomes with significant intensity × time interactions included CSA of the pectoralis major, 1RM, velocity attained against submaximal loads, and MNR
The study used a factorial design allowing independent and interactive effects of %1RM and VL to be assessed
The interaction between %1RM and VL on adaptations was also examined as a primary aim
Results
Pectoralis major cross-sectional area was assessed as a measure of hypertrophy and showed significant changes dependent on both intensity and velocity loss threshold.
Cross-sectional area (CSA) of the pectoralis major was measured before and after the 8-week training program
Significant 'intensity × time' and 'VL × time' interactions were both observed for CSA
The highest CSA gains were associated with the 70%-85% 1RM intensity range and the 50% velocity loss threshold
Assessments also included maximal isometric strength, a progressive loading test, and maximum number of repetitions
Methods
The study design used a large sample of 158 resistance-trained men randomly assigned across 12 training groups defined by combinations of three intensity ranges and four velocity loss thresholds.
158 resistance-trained men participated in an 8-week bench press training program
Participants were randomly assigned to one of 12 groups
Groups were categorized into intensity ranges of 40%-55%, 55%-70%, or 70%-85% 1RM, crossed with VL thresholds of 0%, 15%, 25%, or 50%
Outcome measures included pectoralis major CSA, maximal isometric strength, progressive loading test performance, and maximum number of repetitions
What This Means
This research suggests that how heavy you lift (intensity) and how much you allow your movement speed to slow down during a set (velocity loss) both independently shape the results you get from resistance training. In an 8-week bench press study with 158 trained men divided into 12 groups, researchers found that lifting at higher intensities (70-85% of one-repetition maximum) consistently produced the best outcomes for both muscle size and strength compared to lighter loads. Additionally, allowing greater speed loss within a set (50% velocity loss, meaning you continue the set until bar speed drops by half) led to the most muscle growth and improved muscular endurance, while stopping sets at a moderate speed decline (25% velocity loss) produced the best gains in maximum strength.
These findings matter because they suggest that the common practice of training to failure or near-failure may be best for muscle growth, but stopping somewhat earlier — while still using heavier loads — may be more effective for building peak strength. The research also implies that lighter loads, even when taken to high fatigue, are less effective than heavier loads for both size and strength gains in trained individuals.
This research suggests that people aiming to maximize muscle growth should prioritize heavier loads combined with higher fatigue per set, while those focused on maximal strength may benefit from heavy loads combined with moderate fatigue levels. Both the weight used and when you stop a set appear to matter independently, giving coaches and athletes more precise tools to customize training programs for different goals.
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Pareja-Blanco F, Sánchez-Valdepeñas J, Cornejo-Daza P, Rodiles-Guerrero L. (2026). Optimizing Strength and Hypertrophy: The Combined Effect of Intensity and Velocity Loss Thresholds in Bench Press Training.. Medicine and science in sports and exercise. https://doi.org/10.1249/MSS.0000000000003988