What are "closed chain" sports activities? I heard a brief report on this during an ESPN sports news conference. The newscaster reported a higher rate of injuries during this type of activity.
Except for swimming, most athletic activities are closed chain some of the time. Chains are body parts linked together such as the foot, ankle, knee, and hip. Closed chain means the foot is in contact with the floor or some supporting surface.
When the end of a chain is fixed, motion at one point will affect all other points in the chain. So for example, if the foot is on the floor, any force through the foot can affect the ankle, knee and hip. Squatting and lunging exercises are examples of closed chain activities.
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