title: The effect of progressively increased physical efforts on visual evoked potentials in volleyball players and non-athletes.
abstract: We assessed the effect of physical effort with increasing intensity on neural activity in the visual pathway in volleyball players (n = 10) and non-athletes (n = 10). Participants performed three 10-min tests of increasing intensity on a cycle ergometer. Each participant was assigned individual workloads below the lactate threshold (40% [Vdot]O(2max)), at the lactate threshold (65-75% [Vdot]O(2max)), and above the lactate threshold (80% [Vdot]O(2max)). Four recordings of visual evoked potentials were made: pre-exercise and immediately after each of the three subsequent tests. We assessed neural activity of the visual pathway by examining the amplitude and latency of the N75, P100, and N135 components of the visual evoked potentials waveform. Pre-exercise P100 wave latency was shorter (P < 0.05) in volleyball players than in non-athletes. In non-athletes, the latency of P100 following the first and second effort (40% and 65-75% [Vdot]O(2max)) was reduced compared with pre-exercise (P < 0.01). However, P100 latency increased and P100 amplitude decreased after the third test (80% [Vdot]O(2max)) in non-athletes. In contrast, no significant changes in the latency or amplitude of visual evoked potentials were observed in the athletes in the three tests. Neural conductivity in the visual pathway after exercise might be at least partially dependent on the individual's personal training adaptation status.
authors: Department of Physical Culture and Health Promotion, University of Szczecin, Szczecin, Poland. teresa.zwierko@univ.szczecin.pl
authors: Teresa
authors: T
authors: Zwierko
authors: Wojciech
authors: W
authors: Lubiński
authors: Anna
authors: A
authors: Lubkowska
authors: Ewa
authors: E
authors: Niechwiej-Szwedo
authors: Damian
authors: D
authors: Czepita
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D015308:Anaerobic Threshold; D056352:Athletes; D001642:Bicycling / Q000502:physiology; D005074:Evoked Potentials, Visual; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006801:Humans; D019344:Lactic Acid / Q000378:metabolism; D010806:Physical Education and Training; D005082:Physical Exertion / Q000502:physiology*; D014795:Visual Pathways / Q000502:physiology*; D054798:Volleyball / Q000502:physiology*; D055815:Young Adult
chemical_list: D019344:Lactic Acid