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Vol. 22. Num. 6.01 November 2018
Pages 435-526
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Vol. 22. Num. 6.01 November 2018
Pages 435-526
Original Research
DOI: 10.1016/j.bjpt.2018.03.006
Eccentric training combined to neuromuscular electrical stimulation is not superior to eccentric training alone for quadriceps strengthening in healthy subjects: a randomized controlled trial
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Claudia Ferreira Gomes da Silvaa, Felipe Xavier de Lima e Silvaa, Karoline Baptista Viannaa, Gabriel dos Santos Oliveiraa, Marco Aurélio Vazb, Bruno Manfredini Baronia,
Corresponding author
bmbaroni@yahoo.com.br

Corresponding author at: Universidade Federal de Ciências da Saúde de Porto Alegre, Programa de Pós-Graduação em Ciências da Reabilitação, Rua Sarmento Leite, 245, CEP: 90050-170 Porto Alegre, RS, Brazil.
a Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre, RS, Brazil
b Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
Highlights

  • Eccentric training strengthens the quadriceps muscle.

  • Eccentric training increases muscle thickness and fascicle length.

  • NMES do not change adaptations to eccentric training in healthy subjects.

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Table 1. Subjects’ characteristics.
Table 2. Intragroup analysis for all outcomes assessed in the study.
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Abstract
Background

Both eccentric training and neuromuscular electrical stimulation (NMES) are used for quadriceps strengthening. However, the effects of these interventions combined are unclear.

Objectives

To compare the effects of eccentric training combined to NMES and eccentric training alone on structure, strength, and functional performance of knee extensor muscles of healthy subjects.

Methods

This is a three-arm, single-blinded, randomized controlled trial. Forty-three volunteers (18–35 years) completed the full study schedule: control group (n=15); eccentric training group (ECC; n=15); and eccentric training combined to NMES group (ECC+NMES; n=13). Eccentric training program was performed twice a week for 6 weeks. A biphasic pulsed current (400μs; 80Hz; maximal tolerated intensity) was applied simultaneously to voluntary exercise for ECC+NMES group. Muscle structure (ultrasonography of vastus lateralis – VL, and rectus femoris – RF), strength (isokinetic dynamometry) and functional capacity (single hop test) were assessed before and after the training program by blinded researchers to groups allocation.

Results

Control group had no changes throughout the study in any outcome. Eccentric training (with or without NMES) did not affect concentric peak torque, hop test, and VL pennation angle (effect sizes>0.2). ECC and ECC+NMES programs generated significant adaptations (small to moderate effect sizes) on isometric (8–11%) and eccentric (13%) peak torques, VL muscle thickness (5%), VL fascicle length (5–8%), RF muscle thickness (8–9%), RF pennation angle (−2%), and RF fascicle length (12%).

Conclusion

NMES combined to eccentric training did not influence consistently the type or magnitude of adaptations provoked by knee extensor eccentric training alone in healthy subjects.

Keywords:
Eccentric exercise
Electrostimulation
Knee extensor

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