Early-Morning and Late-Night Maximal Runs: Metabolic and Perceived Exertion Outcomes

Authors

Jenna L. Carducci, Copeman HealthcareFollow
Matthew J. Garver, University of Central MissouriFollow
Whitley J. Stone, Western Kentucky UniversityFollow
Meera Penumetcha, University of Central MissouriFollow
Dustin W. Davis, University of Nevada, Las VegasFollow
Nicolas M. Philipp, University of Central MissouriFollow
Josie N. Hair, University of Central MissouriFollow

Abstract

• People may exercise at the ends of their day to fit activity into their schedule; the purpose of this investigation was to determine if metabolic or perceived exertion outcomes differed between maximal runs early in the morning and late at night.
• After consuming a standardized, glucose drink, thirteen recreationally active individuals completed an early-morning and a late-night run on the treadmill while researchers measured metabolic (aerobic capacity and substrate usage) and perceived exertion outcomes.
• Point of application #1: Aerobic capacity (maximal consumption of oxygen) and the usage of fat as a fuel to support energy production during exercise were similar between runs.
• Point of application #2: Maximal perceived exertion (Borg’s 6-20) was similar during early-morning and late-night runs.
• Point of application #3: While research indicates that people may prefer activity in the morning or evening, and this might impact metabolic responses to the exercise bout, most of our participants (n=8) identified with no preference for exercising in the early-morning or late-night.
• Key Words: glucose; CHO shake; VO₂max; fat oxidation; effort

Repository Citation

Carducci, Jenna L.; Garver, Matthew J.; Stone, Whitley J.; Penumetcha, Meera; Davis, Dustin W.; Philipp, Nicolas M.; and Hair, Josie N. (2020) "Early-Morning and Late-Night Maximal Runs: Metabolic and Perceived Exertion Outcomes," Topics in Exercise Science and Kinesiology: Vol. 1: Iss. 2, Article 2.
Available at: https://digitalscholarship.unlv.edu/scholarship_kin/vol1/iss2/2