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What happens when flexor and extensor muscles contract at same time?
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Dr. Theodore Shybut
Sports Medicine
In brief: Co-contraction
Simultaneous contraction of antagonist muscles is known as co-contraction.
This creates a stabilizing or dampening effect on the involved limb. For example, when holding a drill in space and attempting to control how deep it plunges, your biceps and triceps co-contract around your shoulder and elbow. In some conditions (eg brachial plexus injuries) pathologic co-contraction can limit function.

In brief: Co-contraction
Simultaneous contraction of antagonist muscles is known as co-contraction.
This creates a stabilizing or dampening effect on the involved limb. For example, when holding a drill in space and attempting to control how deep it plunges, your biceps and triceps co-contract around your shoulder and elbow. In some conditions (eg brachial plexus injuries) pathologic co-contraction can limit function.
Dr. Theodore Shybut
Dr. Theodore Shybut
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