Effect of range of motion in heavy load squatting on muscle and tendon adaptations
Manipulating joint range of motion during squat training may have differential effects on adaptations to strength training with implications for sports and rehabilitation. Consequently, the purpose of this study was to compare the effects of squat training with a short vs. a long range of motion. Male students (n = 17) were randomly assigned to 12 weeks of progressive squat training (repetition matched, repetition maximum sets) performed as either a) deep squat (0–120° of knee flexion); n = 8 (DS) or (b) shallow squat (0–60 of knee flexion); n = 9 (SS). Strength (1 RM and isometric strength), jump performance, muscle architecture and cross-sectional area (CSA) of the thigh muscles, as well as CSA and collagen synthesis in the patellar tendon, were assessed before and after the intervention. The DS group increased 1 RM in both the SS and DS with ~20 ± 3 %, while the SS group achieved a 36 ± 4 % increase in the SS, and 9 ± 2 % in the DS (P < 0.05). However, the main finding was that DS training resulted in superior increases in front thigh muscle CSA (4–7 %) compared to SS training, whereas no differences were observed in patellar tendon CSA. In parallel with the larger increase in front thigh muscle CSA, a superior increase in isometric knee extension strength at 75° (6 ± 2 %) and 105° (8 ± 1 %) knee flexion, and squat-jump performance (15 ± 3 %) were observed in the DS group compared to the SS group. Training deep squats elicited favourable adaptations on knee extensor muscle size and function compared to training shallow squats.
KeywordsResistance training Hypertrophy Patellar tendon Jumping performance
Coefficient of variation
Counter movement jump
Dual energy X-ray absorption
Lean body mass
Magnetic resonance imaging
Pearson correlation coefficient
Procollagen type 1 N-propeptide
Series elastic component
Stretch shortening cycle
The authors express their thanks to the subjects for their time and effort, and a special thanks goes to Oliver Faul and Tron Krosshaug for the construction of the DS and the SS figures.
Conflict of interest
No conflicts of interest, financial or otherwise are declared by the authors(s).
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