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Histochemical and morphometric changes in muscles of stroke patients
Clinical Orthopaedics and Related Research
|October 1, 1985
Summary
Stroke-induced hemiplegia causes significant muscle atrophy in both Type 1 and Type 2 muscle fibers, with Type 2 fibers affected more severely. Rehabilitation may promote muscle hypertrophy despite ongoing atrophy.
Area of Science:
- Neurology
- Muscle Physiology
- Rehabilitation Medicine
Background:
- Supraspinal hemiplegia following stroke often leads to muscle weakness and atrophy.
- Limited data exists on specific muscle fiber type changes and the extent of involvement in stroke patients.
Observation:
- Muscle biopsy analysis of 20 stroke patients revealed universal muscle atrophy.
- Type 1 fibers were affected in 100% of patients, and Type 2 fibers in 95%, with Type 2 atrophy being more pronounced.
- Hypertrophy of Type 1 fibers occurred in 45% and Type 2 in 15% of patients.
Findings:
- All muscles examined showed atrophy, predominantly affecting Type 1 and Type 2 muscle fibers.
- Group atrophy and fiber type grouping suggested potential peripheral nerve or root damage in 40% of cases.
- Muscle hypertrophy, particularly in Type 1 fibers, appeared correlated with patient activity levels.
Implications:
- Muscle atrophy is a significant consequence of stroke-related hemiplegia, impacting both major fiber types.
- While rehabilitation may not fully prevent muscle atrophy, it can stimulate beneficial muscle hypertrophy.
- Understanding these fiber-specific changes is crucial for optimizing rehabilitation strategies in stroke survivors.