Giovannai Messina
University of Foggia, Italy
Title: Galvanic skin response and serum orexin A levels in humans increase during aerobic exercise
Biography
Biography: Giovannai Messina
Abstract
Introduction: Orexin-A is a hypothalamic neuropeptide produced in the dorsal and lateral hypothalamus and orexin-producing cells have widespread anatomical projections within the central nervous system. Orexin-A is involved in multiple physiological functions, including eating behavior, thermoregulation and sleep-regulation.
Aim: As the exercise elicits stimulation of the sympathetic activity and temperature rise, the purpose of this experiment is to reveal possible association between exercise and plasmatic concentration of orexin-A which is a peptide involved in the sympathetic and thermogenic reactions. Materials & Methods: Blood samples were collected from participants (men, n=20) before (times 0 and 15 min.) and after (times 30, 45, 60 min.) a cycle ergometer exercise at 75 W for 15 min. Also heart rate, galvanic skin response and rectal temperature were
monitored. Results: The exercise induced a significant increase (p<0.01) in plasmatic orexin A with a peak at 30 min after the exercise bout in association with an increase of the other three monitored variables: HR (p<0.01), GSR (p<0.05) and rectal temperature (p<0.01). Conclusion: These findings are the first demonstration which indicates that plasmatic orexin-A, heart rate, galvanic skin response and rectal temperature is involved in the reactions to aerobic exercise.