ABSTRACT

　In the present study, we investigated the effects of aerobic exercise under dehydratedand euhydrated conditions on human cognitive processing. Fifteen healthy malesperformed 4 × 15-min bouts of cycling exercise, and event-related potentials （ERPs） were recorded in three sessions during somatosensory Go/No-go paradigms （PreandPost exercise and Recovery）．As thermoregulatory and hemodynamic variablesand blood tests, the esophageal temperature, mean skin temperature, heart rate, meanarterial blood pressure, plasma osmolality, hematocrit, and hemoglobin were recorded.The reaction time was earlier at Post than Pre under dehydrated and euhydratedconditions. The peak amplitude of the N140 component, which was mainly relatedto somatosensory processing, was significantly reduced at Post and Recovery thanat Pre under dehydrated conditions, but not under euhydrated conditions. The peakamplitude of the P300 component, which was linked to the cognitive processes ofcontext updating, context closure, and event-categorization, was not affected byaerobic exercise under dehydrated or euhydrated conditions. These results suggest thataerobic exercise under dehydrated conditions affects neural activity for somatosensoryprocessing, while the executive function, which was based on reaction times and errorrates, and higher cognitive processing reflected by P300 would not be affected byaerobic exercise under dehydrated or euhydrated conditions.　

DECENTE SPORTS SCIENCE Vol.40/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE