Autonomic thermoregulatory dysfunction in neurofibromatosis type 1

Area of Science:

• Physiology
• Autonomic Nervous System
• Thermoregulation

Background:

• Neurofibromatosis type 1 (NF1) is associated with neural and cutaneous disorders, and reduced exercise capacity.
• Effective thermoregulation relies on eccrine sweat function and skin vasodilation to manage internal temperature increases from exercise or heat.
• The impact of NF1 on these thermoregulatory mechanisms is not well understood.

Purpose of the Study:

• To investigate the effects of Neurofibromatosis type 1 (NF1) on eccrine sweat function.
• To assess vascular thermoregulatory responses (VTR) in individuals with NF1.
• To determine if NF1 adversely affects the body's ability to regulate temperature.

Main Methods:

• Compared eccrine sweat function and VTR in 25 NF1 volunteers and 23 matched non-NF1 controls.
• Induced sweating using pilocarpine iontophoresis (PILO) and passive heating (HEAT) with 42°C leg immersion.
• Utilized established protocols for measuring sweat function and VTR.

Main Results:

• NF1 group demonstrated a lower sweat rate during PILO compared to controls.
• Individuals with NF1 showed a smaller decrease in diastolic blood pressure during thermal stress.
• NF1 participants exhibited higher tympanic temperatures during passive heating (HEAT).

Conclusions:

• Reduced eccrine sweat function in NF1 individuals.
• Impaired vascular thermoregulatory responses observed in the NF1 group.
• Findings suggest potential autonomic dysfunction in individuals with Neurofibromatosis type 1.