High Load vs. Low Load: A Tale of Two Hamstrings
Study finds distinct and unpredictable muscle responses to different training protocols.
This study aimed to determine if high-load (HL) versus low-load with blood flow restriction (LL-BFR) resistance training programs caused different patterns of hypertrophy among hamstring muscles and the semitendinosus tendon over 9 weeks.
Key Points
Methods
45 recreationally active participants were randomly assigned to HL, LL-BFR, or control groups
HL and LL-BFR groups performed 27 training sessions over 9 weeks
Exercises included stiff-leg deadlifts, front squats, seated leg curls, and leg extensions
Muscle and tendon volumes were measured using 3D ultrasound before and after the training period
Results
Semitendinosus (ST) muscle volume increased more in HL (26.5%) compared to control
Semimembranosus (SM) muscle volume increased more in LL-BFR (21.6%) compared to control
No significant changes were found in biceps femoris long head volume
No significant changes were observed in ST tendon volume for either training group
