Marlon Francys Vidmar1, Bruno Manfredini Baroni2, Alexandre Fróes Michelin3, Márcio Mezzomo3, Ricardo Lugokenski3, Gilnei Lopes Pimentel4, Marcelo Faria Silva2. 1. Graduate Program in Rehabilitation Sciences, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre, RS, Brazil; Hospital Ortopédico de Passo Fundo, Passo Fundo, RS, Brazil. Electronic address: marlonfrancys@msn.com. 2. Graduate Program in Rehabilitation Sciences, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre, RS, Brazil. 3. Hospital Ortopédico de Passo Fundo, Passo Fundo, RS, Brazil. 4. Physical Therapy Department, Universidade de Passo Fundo (UPF), Passo Fundo, RS, Brazil.
Abstract
OBJECTIVE: To compare the effects of conventional (constant load) eccentric training and isokinetic eccentric training on quadriceps muscle mass, strength and functional performance in recreational athletes following anterior cruciate ligament (ACL) reconstruction. METHODS:Thirty recreational male athletes (25 years old) undergoing ACL reconstruction received a standard rehabilitation program. Volunteers were randomized to conventional group (CG; n = 15) or isokinetic group (IG; n = 15) to be engaged in a 6-week (2 sessions/week) quadriceps eccentric training program at the extensor chair or at the isokinetic dynamometer, respectively. Assessments of quadriceps muscle mass (through magnetic resonance imaging), strength (through isokinetic dynamometry) and self-aware functionality (through questionnaire) were performed before and after the training programs. Single leg hop test performance was assessed only at post-training evaluation. RESULTS: IG had significantly higher improvements than CG (p < 0.05) for all muscle mass outcomes (+17-23% vs. +5-9%), as well as for isometric (+34% vs. +20%) and eccentric (+85% vs. +23%) peak torques. There was no between-group difference (p > 0.05) for concentric peak torque, Lysholm score, and single leg hop test. CONCLUSION:Isokinetic eccentric training promotes greater responses than conventional eccentric training on quadriceps muscle mass and strength of recreational athletes following ACL reconstruction.
RCT Entities:
OBJECTIVE: To compare the effects of conventional (constant load) eccentric training and isokinetic eccentric training on quadriceps muscle mass, strength and functional performance in recreational athletes following anterior cruciate ligament (ACL) reconstruction. METHODS: Thirty recreational male athletes (25 years old) undergoing ACL reconstruction received a standard rehabilitation program. Volunteers were randomized to conventional group (CG; n = 15) or isokinetic group (IG; n = 15) to be engaged in a 6-week (2 sessions/week) quadriceps eccentric training program at the extensor chair or at the isokinetic dynamometer, respectively. Assessments of quadriceps muscle mass (through magnetic resonance imaging), strength (through isokinetic dynamometry) and self-aware functionality (through questionnaire) were performed before and after the training programs. Single leg hop test performance was assessed only at post-training evaluation. RESULTS: IG had significantly higher improvements than CG (p < 0.05) for all muscle mass outcomes (+17-23% vs. +5-9%), as well as for isometric (+34% vs. +20%) and eccentric (+85% vs. +23%) peak torques. There was no between-group difference (p > 0.05) for concentric peak torque, Lysholm score, and single leg hop test. CONCLUSION: Isokinetic eccentric training promotes greater responses than conventional eccentric training on quadriceps muscle mass and strength of recreational athletes following ACL reconstruction.
Authors: J Parry Gerber; Robin L Marcus; Leland E Dibble; Patrick E Greis; Robert T Burks; Paul C Lastayo Journal: J Orthop Sports Phys Ther Date: 2007-01 Impact factor: 4.751
Authors: J Parry Gerber; Robin L Marcus; Leland E Dibble; Patrick E Greis; Robert T Burks; Paul C LaStayo Journal: J Bone Joint Surg Am Date: 2007-03 Impact factor: 5.284