Fitness experts weigh in on the differences between concentric vs. eccentric exercise, and why both are important.

You lower into the squat, pause at the bottom, then drive upward to stand; these three phases are called eccentric, isometric ...

Background Most studies of exercise-induced muscle injury have focussed on eccentric contractions, which are known to produce damage and delayed soreness. It is less well known that isometric ...

Here, the muscles are contracting isometrically to hold this gymnast in the crucifix position and are not changing length. When the isometric contractions end, isotonic contraction will occur.

Here, the muscles are contracting isometrically to hold this gymnast in the crucifix position and are not changing length. When the isometric contractions end, isotonic contraction will occur.

Although the specifics have evolved over time, PNF essentially combines static stretching (where a muscle is held in a lengthened position for a short period of time) with isometric muscle ...

Objective: To determine if the combined isometric contractions of knee extension/hip adduction and knee extension/hip abduction will elicit a different quadriceps and gluteus medius electromyographic ...

But take a look at your body under a microscope, and you’ll see that your working muscles are actually contracting in completely different ways depending on the phase of the exercise you’re in ...