Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Hormone and energy substrate changes during prolonged exercise in the heat.

G H Hartung, L G Myhre, D M Tucker

    Aviation, Space, and Environmental Medicine
    |January 1, 1987
    PubMed
    Summary

    This study reveals that during prolonged heat exercise, glucose levels initially rise then fall, while glycerol and epinephrine increase. Hormone changes during exercise differ from those measured only before and after.

    Related Concept Videos

    You might also read

    Related Articles

    Articles linked to this work by shared authors, journal, and citation graph.

    Sort by
    Same author

    Comminuted Fracture of the Skull, Followed by Metastatic Pneumonia and Gangrene.

    The Chicago medical journal and examiner·2023
    Same author

    CHARACTERISATION OF RADIOPHOTOLUMINESCENCE DOSIMETRY SYSTEM FOR INDIVIDUAL MONITORING.

    Radiation protection dosimetry·2020
    Same author

    A need to know.

    The Physician and sportsmedicine·2016
    Same author

    Letters.

    The Physician and sportsmedicine·2016
    Same author

    Regulatory Considerations for the Clinical and Research Use of Transcranial Direct Current Stimulation (tDCS): review and recommendations from an expert panel.

    Clinical research and regulatory affairs·2015
    Same author

    A cognitive-anatomical approach to attention in lexical access.

    Journal of cognitive neuroscience·2013

    Area of Science:

    • Exercise Physiology
    • Endocrinology
    • Environmental Physiology

    Background:

    • Understanding metabolic and hormonal responses during prolonged exercise in heat is crucial for athletes and researchers.
    • Previous studies often lack detailed, time-course measurements during exercise, potentially missing critical transient changes.

    Purpose of the Study:

    • To investigate the time-course of glucose, insulin, glucagon, glycerol, and catecholamine responses during a 16.1 km run in the heat.
    • To compare these responses in trained men with findings from studies on non-trained individuals at lower exercise intensities.

    Main Methods:

    • Eleven trained men performed a 16.1 km run in 30.2°C heat at 80% VO2max.
    • Blood samples were collected pre-run, at 6.4, 12.9, 16.1 km, and 3 hours post-run.

    Related Experiment Videos

  • Measurements included serum/plasma glucose, insulin, glucagon, glycerol, and catecholamines (epinephrine, norepinephrine).

    • Main Results:

    • Glucose initially increased then significantly decreased by 16.1 km. Glycerol showed a substantial increase early and continued rising.
    • Epinephrine increased progressively, while norepinephrine rose early and plateaued. Insulin levels peaked early and then declined.
    • Glucagon increased during the run and remained elevated post-exercise, showing different patterns than in non-trained individuals.

    Conclusions:

    • Hormone and substrate dynamics during prolonged heat exercise are complex and time-dependent, highlighting the limitations of pre- and post-exercise measurements.
    • The observed hormonal responses, particularly the insulin-glucagon relationship, differ from those in non-trained subjects at lower exercise intensities, suggesting training and intensity/environmental factors modify these responses.