Muscle Contraction, Part 2

posted by Malachy P. McHugh
filed under fitness postings

Each motor unit has a different activation threshold. Therefore, the magnitude of the motoneuron action potential will determine how many motor units are activated. Additionally, the discharge rate of the motoneuron varies within each motor unit. Therefore, contraction intensity can be controlled by the number of motor units activated and/or the discharge rate of the active units. It's debatable whether humans can voluntarily activate all motor units of a given muscle for a maximal voluntary contraction. The initial strength gains with resistance training are attributed to greater recruitment of available motor units for maximum efforts. This effect occurs before any hypertrophy is evident.

From the Message Boards

  • I am new to FitClick. I have been on a diet since I was in the 4th grade. My mom was always wanting me to lose weight. I have tried every diet, even amphetimines. I lost over 70 lbs after my twins were born. I managed to keep most of it off until my mom and dad had cancer at the same time. Then, it was more emotional eating. Over the last 20 years since their death I was able to keep the gai...

Follow Us

Explore FitClick
Browse this section for quick links to our calorie counter and other popular diet and fitness features. From diet plans to weight loss programs, FitClick has the content you need to lead a healthy life. Find workout routines, a calorie calculator and more at your source for diet and fitness information.