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1 Rep Max (1RM) | Fitness, Health and Exercise Glossary

What is the definition of 1 Rep Max (1RM) and what does it mean?

1 Rep Max Definition

1 Rep Max (also know as One Repetition Maximum or 1RM) is the standard measure of muscular strength. 1 Rep Max measures the maximum amount of weight that a given muscle can move through a complete contraction (eccentric and concentric) one time, with good form.

1 Rep Max is used in weight training to determine maximum strength and as a way to calculate the upper strength limits when developing a weight and resistance training program. In these cases, a percentage of 1RM may be used to develop target load levels for measuring and/or improving things like muscular endurance (typically 75-90% of 1RM.)

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What Does Muscular Strength Mean? | Fitness, Health & Exercise Glossary

What Is Muscular Strength and How Is It Measured?

Definition of Muscular Strength

Muscular strength is defined as the maximum amount of force that a muscle can exert against some form of resistance in a single effort. 

This is in contrast to muscular endurance, which represents multiple muscle contractions or a sustained muscle contraction over a period of time, for example during running, climbing or performing multiple reps with a dumbbell at the gym.

Practically speaking, you use muscular strength when you lift yourself out of a chair, pick up a heavy object, or push a piece of furniture. In the gym, a single repetition at a given weight is an example of muscular strength.

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