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The Cross-Education Phenomenon: Brain and Beyond.

Ashlee M Hendy¹, Séverine Lamon¹

¹School of Exercise and Nutrition Sciences, Institute for Physical Activity and Nutrition, Deakin UniversityGeelong, VIC, Australia.

Frontiers in Physiology

|May 26, 2017

Summary

Unilateral resistance training enhances strength in the untrained limb through neural pathways, a phenomenon known as cross-education. Further research is needed to explore muscle and hormonal adaptations contributing to this effect.

Keywords:

endocrine system hypertrophy neural plasticity rehabilitation resistance training skeletal muscle

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Area of Science:

Neuroscience
Exercise Physiology
Muscle Physiology

Background:

Unilateral resistance training induces strength gains in the contralateral, untrained homologous muscle, termed cross-education.
This phenomenon is traditionally attributed to neural adaptations, with limited investigation into other physiological systems.
Existing research often overlooks potential structural changes in the untrained muscle.

Purpose of the Study:

To review evidence for structural and functional adaptations in nervous, muscle, and endocrine systems during unilateral resistance training.
To identify limitations in current cross-education research and propose novel contributing factors.
To discuss the implications of cross-education mechanisms for rehabilitation.

Main Methods:

Critical review of existing scientific literature.
Comprehensive search of online scientific databases.

Main Results:

Functional reorganization of the motor cortex, including cross-activation of the ipsilateral motor cortex, significantly contributes to cross-education.
While muscle hypertrophy is often minimal in the untrained limb, experimental designs may limit detection of subtle structural changes.
Neural drive from the untrained motor cortex is a key factor in strength transfer.

Conclusions:

Increased neural drive from the untrained motor cortex is a primary driver of the cross-education effect.
Investigating adaptive changes within muscle fibers and systemic/hormonal factors is crucial for a complete understanding.
Elucidating cross-education mechanisms can enhance rehabilitation strategies for unilateral movement disorders and injuries.