Concentric contraction
Concentric contractions or Iso tonic contractions (iso = constant, Tonic = tension) is one that produces the same amount of tension while shortening as it overcomes a Constant resistance
muscle shortening is affects by 3 factors
1 the initial length of muscle fibers
2. The angle of pull of the muscle on the bony skeleton
3. Percentage of distribution of Type l and Type ll in muscle