Electromyostimulation and plyometric training effects on jumping and sprint time.

Area of Science:

• Sports Science
• Exercise Physiology
• Biomechanical Analysis

Background:

• Neuromuscular training methods like electromyostimulation (EMS) and plyometric training (P) are widely used to enhance athletic performance.
• The combined effects and individual impacts of EMS and P on sprint performance, jumping ability, maximal strength, and muscle hypertrophy require further investigation.

Purpose of the Study:

• To compare the effects of four-week training interventions using EMS, P, or combined EMS and P on knee extensor muscles.
• To evaluate changes in 20 m sprint time (ST), squat jump (SJ), countermovement jump (CMJ), maximal isometric strength (MVC), and muscle cross-sectional area (CSA).

Main Methods:

• Forty physically active male subjects were randomly assigned to four groups: EMS (EG), plyometric (PG), combined EMS and P (EPG), and a control group (CG).
• Training interventions were conducted four times per week for four weeks, with assessments before training, after training, and after two weeks of detraining.

Main Results:

• EMS training improved sprint time (2.4%) and maximal isometric strength (9.1%), with significant hypertrophy (9.0%).
• Combined EMS and P training significantly increased squat jump (7.5%), countermovement jump (7.3%), maximal isometric strength (16.3%), and muscle cross-sectional area (7.1%).
• EMS alone did not improve explosive strength and negatively impacted sprint performance (-2.3% in EPG).

Conclusions:

• Combined EMS and P training is effective for enhancing jumping height and sprint performance in physically active men.
• EMS, whether alone or combined with P, can increase maximal strength and muscle hypertrophy.
• EMS training alone may not improve explosive strength and could potentially hinder sprint performance.