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Physiological responses at the rating of perceived exertion at and above the gas exchange threshold during treadmill running

Kristen C Cochrane, University of Nebraska - Lincoln

Abstract

The purposes of this study were to examine: 1) the metabolic, cardiovascular, respiratory, neuromuscular, and velocity responses during continuous, constant rating of .perceived exertion (RPE) runs at the RPE corresponding to the velocity at the gas exchange threshold (RPEGET) and 15% above GET (RPE GET+15%); and 2) the metabolic efficiency changes during continuous, constant RPE runs at RPEGET and RPEGET+15%. Eleven moderately trained runners performed an incremental treadmill test to exhaustion. GET and GET+15% were determined from the incremental test to exhaustion, and the velocity at GET and GET+15% were used to estimate the RPEGET and RPEGET+15% using linear regression. On separate days, subjects performed 60 min runs at RPEGET and RPEGET+15%, and physiological, neuromuscular, and perceptual responses were recorded. Polynomial regression analyses were used to examine the patterns of responses for all of the variables and paired-samples t-tests were used to determine changes in metabolic efficiency at RPEGET and RPEGET+15%. The results of the polynomial regression analyses indicated that there were negative, quadratic relationships (R2 = 0.96 – 0.99) for O2, RER, E, and velocity vs. time at RPEGET and RPEGET+15%; positive, quadratic relationships (R2 = 0.87 and 0.74) for Fb vs. time at RPEGET and RPEGET+15%; and positive, linear (r2 = 0.73), and no significant (r2 = 0.0) relationships for HR vs. time at RPEGET and RPEGET+15%, respectively. There were negative, linear relationships (r2 = 0.96 and 0.63) for VL and VM EMG RMS vs. time, and positive, linear relationships (r 2 = 0.72 and 0.40) for VL and VM EMG MPF vs. time at RPEGET. In addition, there was a negative, linear relationship (r2 = 0.16) for VL EMG RMS vs. time, a positive, quadratic relationship (R2 = 0.74) for VM EMG RMS vs. time, and positive, quadratic relationships (R 2 = 0.73 and 0.96) for VL and VM EMG MPF vs. time at RPEGET+15% . There were decreases in metabolic efficiency at RPEGET and RPEGET+15%. These findings indicated that the only variable that tracked RPE was the normalized, composite HR vs. time response at RPE GET+15%, and that treadmill running at RPEGET and RPE GET+15% was sustainable for up to 60 min.^

Subject Area

Kinesiology

Recommended Citation

Cochrane, Kristen C, "Physiological responses at the rating of perceived exertion at and above the gas exchange threshold during treadmill running" (2016). ETD collection for University of Nebraska - Lincoln. AAI10097954.
http://digitalcommons.unl.edu/dissertations/AAI10097954

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