The role that exercies plays in our health is whole body support. This article shows a benefit to the nervous system. while this might not be a primary goal for some of you, it is good to know that your nervous system is getting stronger.
Lifting weights makes your nervous system stronger, too
The first few weeks of weightlifting strengthen the reticulospinal tract, not muscles
Date:June 29, 2020
Source:Society for Neuroscience
Summary: Gym-goers may get frustrated when they don’t see results from weightlifting right away, but their efforts are not in vain: the first few weeks of training strengthen the nervous system, not muscles.
Gym-goers may get frustrated when they don’t see results from weightlifting right away, but their efforts are not in vain: the first few weeks of training strengthen the nervous system, not muscles. New research published in JNeurosci reveals how.
The brain orchestrates movement via two major neural highways descending to the spinal cord: the corticospinal tract (CST) and reticulospinal tract (RST). The CST is thought to be the dominant pathway, with the RST controlling posture. However, the CST does not change during strength training, so increased strength must stem from the more primitive RST.
Glover and Baker trained monkeys to pull a weighted handle using one arm, with the weight gradually increasing over twelve weeks. Each day, the scientists stimulated the motor cortex and the two motor tracts, measuring the resulting electrical activity in the arm muscles. Over the course of the training regimen, the electrical response from stimulating the cortex and RST increased — a sign of strengthened signaling. After three more months of strength training, stimulating the RST elicited a greater response in the side of the spinal cord connected to the trained arm. Outputs from the reticulospinal tract become more powerful during weight training and could be the driving force behind increases in strength.
Materials provided by Society for Neuroscience. Note: Content may be edited for style and length.
- Isabel S Glover, Stuart N Baker. Cortical, corticospinal and reticulospinal contributions to strength training. The Journal of Neuroscience, 2020; JN-RM-1923-19 DOI: 1523/JNEUROSCI.1923-19.2020