Why are muscles hard?
Sep 30, 2022
Source: Cainiu Health
Dr. Lin Yunfei
Introduction
Under a relaxed state, muscles are soft and elastic. Muscle hardness may result from non-pathological factors such as intense physical activity, cold exposure, or poor blood circulation, or from pathological conditions such as myofasciitis, Parkinson's disease, or rheumatic disorders. Patients can receive appropriate massage to promote local blood circulation, pay attention to keeping warm in daily life, and engage in moderate exercise to enhance bodily function.
Muscles are normally soft and elastic when relaxed. However, muscle stiffness may result from non-pathological factors such as intense exercise, cold exposure, or poor blood circulation, as well as pathological conditions including myofasciitis, Parkinson's disease, and rheumatic disorders.
I. Non-Pathological Factors
1. Intense Exercise
Long-term high-intensity training or excessive fatigue without adequate muscle relaxation can lead to symptoms of generalized muscle tightness and stiffness.
2. Cold Exposure
Exposure to cold can disrupt blood circulation in surrounding soft tissues and cause blood vessel constriction, leading to a sudden reduction in blood supply. This may trigger muscle tension, spasms, and subsequent stiffness.
3. Poor Blood Circulation
Remaining in the same posture for prolonged periods, exposure to cold, or intense physical activity can slow blood flow and impair circulation, resulting in muscle stiffness.
II. Pathological Factors
1. Myofasciitis
This condition typically occurs when local muscles become weakened. Prolonged muscle contraction leads to sterile inflammation, commonly known as muscle strain. After injury, muscles may develop compensatory stiffness to maintain force production and body posture. This represents a pathological change characterized by reduced muscular elasticity.
2. Parkinson’s Disease
In Parkinson’s disease, degeneration and death of dopaminergic neurons in the substantia nigra lead to increased muscle tone in both extensor and flexor muscles. Patients may experience muscle rigidity, stiffness, reduced voluntary movement, and bradykinesia.
3. Rheumatic Disorders
Conditions such as rheumatoid arthritis and other rheumatic diseases can cause generalized muscle tightness and stiffness.
Patients with muscle stiffness may benefit from appropriate massage to improve local blood circulation. It is important to stay warm by dressing appropriately and to engage in moderate physical activity to enhance mobility. If severe muscle stiffness or other concerning symptoms develop, prompt medical evaluation and standardized treatment are recommended.
