When one side of the body improves in how quickly it can generate force, this is linked to higher electrical activity in the soleus muscle on the opposite side during the first 50 milliseconds of...
Mechanism
Synthesis from 1 study
Training one leg makes the brain send stronger signals to the opposite leg’s calf muscle right when it starts pushing, making it activate faster and produce force more quickly. This happens without any change in the spinal reflexes or muscle size — it’s all about the brain getting better at turning...
Most probable mechanism
When one leg is trained, the brain sends stronger signals to the opposite leg's calf muscle at the very start of a quick push, making it fire faster and harder right away — this boosts how quickly force builds up, without any change in the spinal reflexes that normally help muscles respond.
Unilateral resistance training induces neuroplastic changes in the motor cortex and associated descending pathways, increasing the efficiency and magnitude of voluntary motor commands sent to the contralateral spinal cord.
These enhanced descending signals increase the synchronous recruitment of motor units in the soleus muscle during the initial 0–50 milliseconds of force production, elevating electromyographic activity before significant muscle contraction occurs.
The increased early neural drive to the soleus results in faster rate of torque development without changes in spinal reflex sensitivity or muscle size.
Evidence from Studies
Supporting (1)
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Contralateral training effects of low-intensity blood-flow restricted and high-intensity unilateral resistance training
Contradicting (0)
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