The EMG used in this experiment is a surface EMG, which means it records the voltage produced by fibers in the muscle strong enough to be detected by surface electrodes. The EMG will detect the electrical signals produced by the muscle and translate in terms of millivoltage. To conclude, this is all made possible with series of events. Voluntary muscle movement begins with action potential. Action potential is an electrical potential initiated from the brain to target a specific muscle. Also, action potentials are electrical impulse signals, which are a temporary shift between negative and positive ions across a neurons membrane that is referred as voltage. The action potential will propagate to a motor neuron and pass through a neuromuscular junction, and this is where the chemical synapse happens. …show more content…
In addition, each fiber has a single neuromuscular junction, but the motor neuron branches and creates many neuromuscular junctions with other muscle fibers. When more stimuli occurs or is needed the brain will signal for several fibers to contract in unison. A unison contraction is created by motor unit recruitment. It will also depend on dominant or non-dominant forearms. A person who typically uses their right hand more creates more motor recruitments and large muscle fibers. There will be a higher tonus in the dominant forearm. Tonus or muscle tone serves to maintain the muscle in a constant state of readiness and helps maintain posture. The following EMG experiment is a way to better understand muscle contraction, muscle recruitment and the force generated by the muscle with each grip. Grip strength is maintained by 2 seconds increments of increased grip strength in the dominant and non-dominant