title: Placebo Effect: Influence on Repeated Intermittent Sprint Performance on Consecutive Days.
abstract: Despite the available literature addressing the placebo effect's role in mediating human performance, there is a paucity of research addressing the possibility of a placebo effect both within and between bouts of repeated sprint performance on consecutive days. Therefore, the purpose of this study was to determine whether the administration of a placebo influences recovery during sessions of intermittent sprinting. Ten subjects performed 4 repeated sprint tests under 2 different conditions; 2 while being administered a control beverage separated by 24 hours of recovery and the other 2 with a placebo beverage separated by 24 hours of recovery. Before each sprint test, subjects provided perceived recovery status (PRS). Ratings of perceived exertion were recorded within 5 seconds after each sprint. After each repeated sprint protocol, subjects were asked to provide a rating of perceived exertion (RPE), rate their pain, and provided a blood lactate sample. Power was recorded throughout each session from a nonmotorized treadmill to analyze changes in sprinting performance. Repeated-measures analysis of variance was used to determine significant differences in peak and mean power, PRS, RPE, pain, and blood lactate. The placebo trial produced significantly higher peak (p < 0.001) and mean power (p = 0.002) vs. the control in later sprints absent of any other significant difference in metabolic or perceptual strain (p > 0.05). In conclusion, it seems that the administration of a placebo can attenuate the decline in performance as fatigue increases during repeated sprinting bouts.
authors: 1Exercise Science Program, Bowling Green State University, Bowling Green, Ohio; and 2Sport Management Program, Bowling Green State University, Bowling Green, Ohio.
authors: Danilo V
authors: DV
authors: Tolusso
authors: C Matthew
authors: CM
authors: Laurent
authors: Adam M
authors: AM
authors: Fullenkamp
authors: David A
authors: DA
authors: Tobar
mesh_terms: D000328:Adult; D054874:Athletic Performance / Q000502:physiology / Q000523:psychology*; D001628:Beverages; D015415:Biomarkers / Q000097:blood; D005080:Exercise Test; D005221:Fatigue / Q000097:blood / Q000503:physiopathology / Q000523:psychology*; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D010465:Perception; D058573:Performance-Enhancing Substances; D005082:Physical Exertion / Q000502:physiology; D015990:Placebo Effect; D012420:Running / Q000502:physiology / Q000523:psychology*
chemical_list: D015415:Biomarkers; D058573:Performance-Enhancing Substances; D019344:Lactic Acid