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Muscle fatigue

Inability of muscle fibers to contract after long period of contraction.

latent period

Phase of contraction; time between muscle fiber stimulation and measurement of force generation.

Motor Unit

Motor neuron and all the muscle fibers it innervates.

Contractile period

Phase of contraction; period of force generation.

Unfused tetanus

Type of wave summation with partial relaxation observed between twitches.

Motor unit recruitment

Increasing the number of motor units that are stimulated to contract.


Single contractile event in response to single action potential.

Relaxation period

Phase of contraction; period during which more crossbridges detach than reattach to thin filaments.

fused tetanus

Type of wave summation with no observable relaxation between twitches.

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