Skeletal muscle adaptations to heat therapy

Area of Science:

• Physiology
• Molecular Biology
• Exercise Science

Background:

• Heat therapy (HT) has long been used clinically, but its underlying molecular mechanisms are not fully understood.
• Foundational studies in cell cultures and rodents showed heat stress triggers intracellular signaling and muscle remodeling.
• Recent research has elucidated key molecular players and signaling networks involved in skeletal muscle adaptation to heat.

Purpose of the Study:

• To explore the fundamental mechanisms of heat therapy's therapeutic effects on skeletal muscle.
• To understand the molecular signaling pathways activated by heat stress in skeletal muscle.
• To evaluate the translational relevance of heat stress adaptations from animal models to human skeletal muscle.

Main Methods:

• Review of foundational studies in cultured cells and rodent models.
• Analysis of recent physiological and molecular investigations into heat stress signaling.
• Examination of translational studies assessing heat therapy effects in humans.

Main Results:

• Heat stress activates signaling pathways for angiogenesis, muscle hypertrophy, mitochondrial biogenesis, and glucose metabolism.
• Mechanisms involve elevated temperature, increased intracellular calcium, and enhanced energy turnover.
• Translational studies indicate local and whole-body HT can improve capillary growth, mitochondrial function, insulin sensitivity, and prevent muscle wasting in humans.

Conclusions:

• Heat therapy activates specific molecular signaling pathways that promote skeletal muscle adaptations.
• These adaptations include enhanced mitochondrial function, improved metabolism, and resistance to muscle wasting.
• Heat therapy presents a viable alternative for individuals unable to engage in traditional exercise regimens to manage skeletal abnormalities.