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Open-Chain and Closed-Chain Exercises

Comparison of open-chain seated knee extension and closed-chain squatting.
Simplified comparison. Stability requirements and functional relevance depend on the exercise and the individual.

Both exercise types can be useful. Neither is universally safer or more effective; the exercise, load, movement range and clinical situation matter.

Open-chain exercises involve free movement of the distal end of a limb. For example, during seated knee extension, the foot moves freely, making it easier to target and strengthen a specific muscle.

Closed-chain exercises involve the distal end of a limb being fixed or relatively fixed. For example, during a squat, multiple joints and muscle groups work together, making the movement more similar to everyday activities.

Their importance lies in the fact that the same muscle can function differently under different movement conditions. [1]

Open chain: targeted local training.
Closed chain: integrated functional training.

General information only; not a substitute for medical assessment, diagnosis or treatment.

References

  1. Escamilla et al.: Biomechanics of the knee during closed kinetic chain and open kinetic chain exercises
  2. Wilk et al.: A comparison of tibiofemoral joint forces and electromyographic activity during open and closed kinetic chain exercises