What is the purpose of heat packs when treating musculoskeletal injuries?

Heat packs are commonly used in the treatment of musculoskeletal injuries primarily to increase blood flow and improve mobility. Applying heat to an affected area helps to dilate blood vessels, which enhances circulation and brings more oxygen and nutrients to the injury site, ultimately promoting healing. Furthermore, the warmth from the heat pack can relax muscles and decrease stiffness, which facilitates more comfortable movement and flexibility in the area.

While heat may reduce pain and contribute to comfort, the most significant and direct effects relate to improving blood flow and encouraging the healing process. The use of heat is generally indicated in the subacute and chronic stages of healing when swelling has already diminished, and the focus shifts toward restoring normal function and mobility.