Development of a neuromuscular electrical stimulation protocol for sprint training

Area of Science:

• Exercise Physiology
• Skeletal Muscle Adaptations
• Neuromuscular Electrical Stimulation (NMES)

Background:

• Sprint training enhances skeletal muscle adaptations, including sarcoplasmic reticulum (SR) Ca(2+) release.
• Certain populations, like the elderly or those with cardiac issues, cannot tolerate high-intensity sprint exercise.
• Developing alternative methods to achieve sprint training benefits is crucial for these groups.

Purpose of the Study:

• To develop a tolerable neuromuscular electrical stimulation (NMES) protocol.
• To induce skeletal muscle adaptations similar to those seen with sprint training.
• To provide a safe alternative for individuals unable to tolerate traditional sprint exercise.

Main Methods:

• Modeled NMES protocol after a sprint exercise protocol.
• Utilized a novel electrode configuration and stimulation sequence for tolerance and efficacy.
• Trained knee extensor muscles in nine healthy young subjects.

Main Results:

• NMES training significantly increased SR Ca(2+) release and citrate synthase activity.
• A decrease in myosin heavy chain IIx isoform percentage was observed.
• Muscle cross-sectional area increased significantly, with a trend towards increased isometric force.

Conclusions:

• An appropriately designed NMES protocol can mimic sprint training benefits.
• NMES offers a low time commitment and training volume approach.
• NMES holds potential for individuals unable to tolerate traditional sprint training.