Independent Influence of Spinal Cord Injury Level on Thermoregulation during Exercise.

Area of Science:

• Exercise physiology
• Thermophysiology
• Neurology

Background:

• Spinal cord injury (SCI) affects thermoregulation during exercise.
• Previous studies have not fully isolated the impact of SCI level on heat responses.
• Understanding these effects is crucial for athletes with SCI.

Purpose of the Study:

• To determine the independent influence of spinal cord injury (SCI) level on core body temperature and sweating during exercise in heat.
• To differentiate the effects of tetraplegia (TP) and paraplegia (high [HP] and low [LP]) from able-bodied (AB) individuals.

Main Methods:

• 31 trained males (8 TP, 7 HP, 8 LP, 8 AB) performed arm ergometry in 35°C heat.
• Metabolic heat production was standardized across groups.
• Esophageal temperature, skin temperature, and local sweat rate were measured.

Main Results:

• Core temperature increase was greatest in TP, followed by HP, LP, and AB.
• SCI level explained a significant portion of core temperature variability in paraplegics.
• Sweating was absent in TP, while thermosensitivity varied between groups, with LP showing lower upper back sweating response than AB.

Conclusions:

• SCI level is a primary determinant of core temperature rise during heat exercise.
• Absence of sweating in tetraplegia significantly limits evaporative heat loss.
• Findings highlight the distinct thermoregulatory challenges faced by individuals with different levels of SCI.