Differnces between Isotonic contraction and isometric contraction.

ISOTONIC CONTRACTION :

1. In this the tension is constant while the length of the muscle varies.
2. It has a shorter contractions period and a longer relaxation period.
3. When temperature increases, isotonic contraction decreases.
4. It is less energy efficient as more heat is released.
5. During isotonic contraction, shortening occurs and external work is done.
6. Isotonic contraction occurs in the middle of a contraction.
7. During muscle contraction, isotonic phase decreases when load increases.

ISOMETRIC CONTRACTION:

1. In this the muscle length is constant while the tension varies.
2. It has a longer contractions period and a shorter relaxation periods.
3. When temperature increases, isometric contraction also increases.
4. It is more energy efficient as less heat is released.
5. During isometric contraction, no shortening occurs and therefore, no external work is done.
6. Isometric contraction occurs in the beginning and end of all contractions.
7. During muscle contraction, isometric phase increases when load increases.