Pinheiro F.A., Santos T.M., Ugrinowitsch C., Noakes T.D., Pires F.O.
Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, Brazil; School of Physical Education and Sport, University of São Paulo, Brazil; Exercise Psychophysiology Research Group, Physical Education Department, Federal University of Pernambuco, PE, Brazil; Sports Science Institute of South Africa, University of Cape Town, South Africa
Pinheiro, F.A., Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, Brazil, School of Physical Education and Sport, University of São Paulo, Brazil; Santos, T.M., Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, Brazil, Exercise Psychophysiology Research Group, Physical Education Department, Federal University of Pernambuco, PE, Brazil; Ugrinowitsch, C., School of Physical Education and Sport, University of São Paulo, Brazil; Noakes, T.D., Sports Science Institute of South Africa, University of Cape Town, South Africa; Pires, F.O., Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, Brazil, School of Physical Education and Sport, University of São Paulo, Brazil
Studies have shown that there is no effect of light deprivation in closed-loop exercise performance, however less is known about the open-loop exercise performance. Thus, we verified if light deprivation may affect performance and psychophysiological responses to a time-to-exhaustion (TE), constant intensity exercise test. Twelve men performed TE tests (at 80% WPEAK of maximal incremental test) in control and light-deprived condition. Gaseous exchange (VE and VO2), heart rate (HR) and vastus lateralis electromyography (EMG) were continuously assessed, ratings of perceived exertion (RPE) and associative thoughts to exercise (ATE) were obtained every 60s. Responses at absolute time of exercise matched by the shortest time to exhaustion, and responses at exhaustion were compared between conditions (P<0.05). Exhaustion was shortened (5.0±1.6min vs 6.4±2.4min) and RPE slope was elevated in light deprivation, when compared to control (P<0.05). Responses of VE, VO2 and RPE were greater at exhaustion in light deprivation TE test than at the equivalent, paired time in control test. However, responses were similar at exhaustion of both TE tests; the exception was the lower EMG when the light was deprived. The light deprivation shortened the exhaustion and increased RPE in TE test, until the attainment of similar maximal psychophysiological responses. © 2015 Elsevier Inc.
adult; Article; associative thought to exercise; controlled study; cycling; electromyography; exercise test; exercise tolerance; exhaustion; heart rate; human; human experiment; light; light deprivation; male; normal human; oxygen consumption; physical performance; priority journal; psychophysiology; rating of perceived exertion; task performance; time to exhaustion exercise test; vastus lateralis muscle; warm up