P-Fit Muscular Strength + Endurance

Slow-twitch muscles

Red muscle fibers which contract slowly and release little force but are slow to fatigue

Eccentric

Part of a movement where the muscle is lengthening and controlling the movement with resistance and gravity

Tendons

Attach muscles to bones

Motor unit

A motor nerve and all the muscle fibers it controls

Isotonic

Muscle movement where the body part moves against resistance/gravity

Concentric

Part of a movement where the muscle shortens and creates force

Fast-twitch muscles

White muscle fibers that are quick to fatigue but release large amounts of force quickly

Muscle fiber recruitment

Process of involving more muscle fibers to increase force production during a movement

Hypertrophy

Increase in muscle size due to training

Hyperplasia

Increase in muscle quantity

Isometric

Muscle movement where muscle does not move but there is still tension

About how many skeletal muscles are in the body?

~600

Maintenance phase

Phase of weight training where only 1 workout per week is required

Starter phase

Beginning phase of weight training; shortest phase

Slow progression phase

2nd phase of weight training: longest phase

Isokinetic

Muscle movement where force is kept equal through the entire movement

Intermediate-twitch fibers

Muscle fibers that have both the characteristics of slow and fast twitch fibers; contract quickly, fatigue resistant