Effect of range of motion in heavy load squatting on muscle and tendon adaptations

Abstract

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.

DOI: 10.1007/s00421-013-2642-7

Extracted Key Phrases

9 Figures and Tables

050100150201520162017
Citations per Year

124 Citations

Semantic Scholar estimates that this publication has 124 citations based on the available data.

See our FAQ for additional information.

Cite this paper

@article{Bloomquist2013EffectOR, title={Effect of range of motion in heavy load squatting on muscle and tendon adaptations}, author={K. Bloomquist and H. Langberg and S. Karlsen and S. Madsgaard and M. Boesen and T. Raastad}, journal={European Journal of Applied Physiology}, year={2013}, volume={113}, pages={2133-2142} }