The effects of a 'fatigue inducing' (Nocebo) on peak minute power and VO2-peak performance during incremental arm crank ergometry
Cardiff Metropolitan University
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This investigation aimed to explore the impact of inert sugar-free drinks described as 'fatigue inducing' (Nocebo) on peak minute power (PMP) and VO2-peak performance during incremental arm crank ergometry (ACE). Seven, healthy, non-specifically trained male rugby players volunteered to partake within the current study with the option to withdraw at any point. A Control trial with repeated measures was used as an assessment for the differences in PMP (W), oxygen uptake, heart rate (HR), minute ventilation, respiratory exchange ratio (RER) and subjective reports of perceived exertion (LRPE) and central ratings of perceived exertion (CRPE), between two separate, but identical ACE VO2 peak tests. Participants were required to drink 500 ml of a 'fatigue inducing' drink (Nocebo) or water (Control) 15 minutes prior to exercise testing. Pain and effort perception (LRPE and CRPE) was assessed by means of a Numerical Rating (Borg scale) ranging from 6 = Very, very light to 20 = maximum imaginable. Participants within the current study undertook an incremental VO2 peak test on the arm crank ergometer. Participants were required to rotate the arm crank ergometer handles at a constant pace of 70 rev· min-1 throughout, whilst power output increased by 10 W every minute. Results indicated that the 'fatigue inducing' drink (Nocebo) caused no significant decrease in PMP (W) (P = 0.70). A comparison of the PMP (W) and the VO2peak achieved during both trials also indicated no significant difference (P = 0.67). However, the impact of trial order may have resulted in a possible learning effect, thus affecting the results. Furthermore, there is limited literature available regarding the Nocebo response to exercise in order to make considerable comparisons. Therefore, the time has come to broaden our understanding of the Nocebo response to exercise and their potential to be manipulated to either positively / negatively impact upon sports performance.
CARDIFF SCHOOL OF SPORT DEGREE OF BACHELOR OF SCIENCE (HONOURS) SPORT AND EXERCISE SCIENCE
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