Effects of Different Neuromuscular Electrical Stimulation Parameters on Quadriceps Neuromuscular Performance in Competitive Athletes

Abstract : PURPOSE: To evaluate the effects of six weeks of training with two different types of neuromuscular electrostimulation (NMES) currents on muscle performance in competitive athletes. METHODS: This controlled and randomized clinical trial included 20 athletes, equally divided into three groups: medium frequency current group with 500 μs (MF-500) (n=7), low frequency current group of with 500 μs (PC-500) (n=5) and control group (CG) (n=8). Each group had evaluated, before and after the intervention: the peak torque of knee (PT), muscle thickness and signs of electromyography (EMG) of the vastus lateralis (VL), and the sensory discomfort level (VAS). The training with NMES was performed 3 times per week and consisted of 18 sessions, 15 minutes per session (36 isometric involuntary contractions per session), 6s duration in each contraction (with 1s rise time - TON and 1s descent time - TOFF). For statistical analysis of homogeneity was applied Levene’s test. Mixed ANOVA test was used to verify the existence of significant differences between the measurements. The significance level was 5%. RESULTS: There was no significant difference between any groups for all variables (p > 0.05): PT (MF500: pre = 222.5 ± 42.2 Nm and post = 219.9 ± 54 Nm; PC500: pre = 231.1 ± 82.2 Nm and post = 244.3 ± 79, 9 Nm; CG: pre = 243 ± 40.1 Nm and post = 225.3 ± 43.2 Nm), muscle thickness (MF500: pre = 22.9 ± 2.5 mm and post = 23.7 ± 2.8 mm; PC500: pre = 23 ± 2.6 mm and post = 23.5 ± 2.7 mm; CG: pre = 25.9 ± 4.7 mm and post = 25.9 ± 4.3 mm) and EMG (MF500: pre = 0.4 ± 0.4 RMS and post = 0.5 ± 0.5 RMS; PC500: pre = 0.7 ± 0.4 RMS and post = 0.7 ± 0.3 RMS; CG: pre = 0, 8 ± 0.5 RMS and post = 0.7 ± 0.4 RMS). In addition, all current produced similar levels of discomfort, with no significant difference (p > 0.05) in the VAS (MF500: pre = 9.6 ± 0.5 and post = 9.1 ± 1.5; PC500: pre = 9.8 ± 0.5 and post = 9.4 ± 1.3). CONCLUSION: The NMES training applied with medium or low frequency currents and the same pulse duration have the same efficiency and neuromuscular performance in the quadriceps of competitive athletes.
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Medicine and Science in Sports and Exercise, American College of Sports Medicine (ACSM), 2017, 49 (5S), pp.462. 〈http://journals.lww.com/acsm-msse/Fulltext/2017/05001/Effects_of_Different_Neuromuscular_Electrical.1348.aspx〉. 〈10.1249/01.mss.0000518153.44347.cb〉
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Soumis le : jeudi 20 juillet 2017 - 15:11:58
Dernière modification le : vendredi 8 juin 2018 - 14:50:24

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Pedro F A Oliveira, Karenina a G Modesto, Quentin Andrieux, João Luiz Q. Durigan, Nicolas Babault. Effects of Different Neuromuscular Electrical Stimulation Parameters on Quadriceps Neuromuscular Performance in Competitive Athletes. Medicine and Science in Sports and Exercise, American College of Sports Medicine (ACSM), 2017, 49 (5S), pp.462. 〈http://journals.lww.com/acsm-msse/Fulltext/2017/05001/Effects_of_Different_Neuromuscular_Electrical.1348.aspx〉. 〈10.1249/01.mss.0000518153.44347.cb〉. 〈hal-01565982〉

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