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Muscle Stimulation Frequency

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Wave summation
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Related Experiment Video

Updated: Apr 28, 2026

Quantifying Arms and Legs Contributions during Repetitive Electrically-Assisted Sit-To-Stand Exercise in Paraplegics: A Pilot Study

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Published on: November 11, 2022

Comparative Effects of Different Focus Methods on Muscular Activation During Single-Leg-Squat Exercise.

E S Atalay¹, Ç Soylu¹, B Kılınç²

¹University of Health Sciences Turkey, Gulhane Faculty of Physiotherapy and Rehabilitation, Emrah Mah, Ankara, Turkey.

Nigerian Journal of Clinical Practice

|April 27, 2026

Summary

This summary is machine-generated.

External focus during single-leg squats enhances lower extremity muscle activation compared to internal focus or no focus. This finding is crucial for optimizing training and rehabilitation programs utilizing this exercise.

Keywords:

External focus quadriceps/hamstring ratio single-leg squat

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Area of Science:

Biomechanics
Exercise Physiology
Sports Science

Background:

Single-leg squats are common in training and rehabilitation.
Focus during exercise influences concentration and muscular activity.
No prior studies compared different focusing methods during single-leg squats.

Purpose of the Study:

To compare lower extremity muscular activations under external focus, internal focus, and no focus conditions during single-leg squats.

Main Methods:

Surface electromyography (EMG) measured muscle activity (Gluteus Medius, Vastus Lateralis, Vastus Medialis, Rectus Femoris, Biceps Femoris, Semitendinosus).
Participants performed single-leg squats under three conditions: external focus, internal focus, and no focus.

Main Results:

Quadriceps activation was higher during the descent phase, while hamstring activation was greater during the ascent phase.
External focus resulted in greater overall muscle activation compared to internal focus and no focus.

Conclusions:

Employing focus strategies during single-leg squats can alter the resulting muscular response.
External focus may be a more effective strategy for enhancing muscle activation during this exercise.