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Leg muscles recruitment pattern in soccer players and active individuals during isometric contractions
Universidade Estadual Paulista (UNESP)
This study aimed to compare the torque, torque ratio (Hamstrings:Quadriceps - H:Q), electromyographic (EMG) activity and EMG ratio (knee flexors:knee extensors EMG) in soccer players (SG, N=10) and active subjects (AG, N=10). Subjects performed three maximal voluntary isometric knee extensions and flexions at 45° and 90° to determine the peak torque and EMG activity. Torque and EMG activity of the knee flexor (biceps femoris [BF] and semitendinosus [ST]) were divided by the torque and EMG activity of the knee extensor (vastuls lateralis [VL] and rectus femoris [RF]) to calculate torque ratios (H:Q) and EMG ratios (BF:VL, BF:RF, ST:VL, ST:RF). The flexion torque was significantly higher for SG (p<0.05) in 45° and 90°. EMG activity for SG was significantly higher in agonist contractions for VL, RF and ST, and significantly lower in antagonist contractions for RF and ST when compared to AG Torque and EMG ratios were similar between groups and there were good correlations between torque ratio and BF:VL ratio (r=0.71, p=0.02) and BF:RF ratio (r=0.81, p=0.004) at 45. The EMG results could overestimate the joint balance calculated using torque ratios. Differences in recruitment pattern between soccer players and non-athletes can be related to the training routines and the EMG ratios presents applicable in trained populations.
Issue Date: 
Electromyography and Clinical Neurophysiology, v. 49, n. 2-3, p. 93-101, 2009.
Time Duration: 
  • EMG
  • Soccer
  • Torque-H:Q ratios
  • adult
  • athlete
  • controlled study
  • electromyography
  • extensor muscle
  • flexor muscle
  • hamstring
  • human
  • human experiment
  • joint stability
  • knee function
  • leg muscle
  • male
  • muscle isometric contraction
  • neurophysiological recruitment
  • normal human
  • quadriceps femoris muscle
  • rectus femoris muscle
  • semitendinous muscle
  • sport
  • torque
  • training
  • vastus lateralis muscle
  • Adolescent
  • Electromyography
  • Humans
  • Isometric Contraction
  • Knee Joint
  • Male
  • Physical Fitness
  • Quadriceps Muscle
  • Torque
  • Young Adult
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Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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