The Effect of Endurance Exercise Modality on Markers of Fatigue

Andrew R. Moorea, Jasmin C. Hutchinsona, Christa R. Wintera, Paul C. Daltona, Vincent J. Paolonea

Abstract


Background: Exercise power output, and resulting fatigue, is regulated based on central and peripheral sensory input. Whether exercise mode, specifically, contributes to this regulation remains unexplored. Objective: This study was designed to determine if differences in markers of fatigue would be present during two time trials of similar duration and intensity, as a result of exercise mode (cycling and rowing). Method: In a randomized crossover design, nine subjects completed the two 7-min time trials, on different days. Exercise power output, heart rate, rating of perceived exertion, and blood lactate measurements were analyzed using repeated-measures ANOVAs. Results: There was a significant interaction between mode and time for power output (p =.02), but no significant differences between matched time points were observed for any of the dependent variables used to assess fatigue (p >.05). Conclusion: Similar levels of heart rate, perceived exertion, and blood lactate for time trials on different modes, but with the same duration and directed intensity, suggest that in a laboratory environment, exercise is regulated more by physiological disturbance and sensory cues than by exercise mode. These findings support the sensory tolerance limit of exercise fatigue.

Keywords


Ergometry, Rowing, Heart Rate, Lactate, Sensory Processing, Perception

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DOI: http://dx.doi.org/10.7575/aiac.ijkss.v.9n.3p35

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