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The interaction of fatigue and load on reaction time and decision-making during an affordance-based task

Johnson, Caleb (2018) The interaction of fatigue and load on reaction time and decision-making during an affordance-based task. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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The process by which an athlete is attuned to their affordances for action in a given environment is known as perceptual-motor calibration. However, given that athletes operate in dynamic, fluid environments, they must be able to recalibrate to account for perturbations, such as fatigue or load carriage. PURPOSE: To examine the independent and interactive effects of low intensity to fatiguing exercise and load carriage on perceptual-motor calibration PROCEDURES: 23 participants (Age (yrs) = 25.26 ± 3.26) completed an incremental fatigue protocol, with stages of low, moderate, high, and fatiguing intensities, on two separate occasions (loaded/unloaded). At baseline and the end of every stage, subjects made perceptual-motor judgements for maximal jump distance, and the accuracy of judgements (ACC) and reaction time (RT) were calculated. 2x5 ANOVAs, or nonparametric equivalents, were utilized to test for mean differences in ACC and RT across exercise intensity and load carriage conditions. RESULTS: No interaction of exercise intensity and load carriage was detected, or main effect of load carriage. A main, quadratic effect of exercise intensity was detected on RT (F = 18.587, p < 0.001), with RTs decreasing through the moderate stage (Mean Difference (ms) = -38.25) and increasing through post-fatigue (Mean Difference (ms) = 38.817), however no effect was detected on ACC. CONCLUSIONS: The results indicate that exercise has a significant effect on perceptual-motor calibration, with improvements through moderate intensity exercise, and decrements with higher intensities, necessitating recalibration. However, load carriage appears to not have a significant impact on perceptual-motor calibration.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Johnson, Calebcdj20@pitt.educdj200000-0003-4945-7813
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairConnaboy,
Committee MemberNindl,
Committee MemberLovalekar,
Committee MemberPepping,
Committee MemberFlanagan,
Date: 12 September 2018
Date Type: Publication
Defense Date: 11 June 2018
Approval Date: 12 September 2018
Submission Date: 2 July 2018
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 123
Institution: University of Pittsburgh
Schools and Programs: School of Health and Rehabilitation Sciences > Sports Medicine and Nutrition
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: perception-action; affordances; action boundary; motor control
Date Deposited: 12 Sep 2018 13:44
Last Modified: 12 Sep 2018 13:44


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