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

Influence of ingested fluid volume on physiological responses during prolonged exercise

G K McConell1, C M Burge, S L Skinner

  • 1Department of Physiology, University of Melbourne, Parkville, Victoria, Australia.

Acta Physiologica Scandinavica
|June 1, 1997
PubMed
Summary

Fluid intake significantly impacts physiological responses and performance during prolonged strenuous exercise. Adequate hydration (100% fluid replacement) minimizes dehydration, maintaining lower heart rate, rectal temperature, and improved endurance performance compared to no or partial fluid replacement.

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

Characterization of expiration air jets and droplet size distributions immediately at the mouth opening.

Journal of aerosol science·2020
Same author

Body mass index and health-related quality of life.

Obesity science & practice·2018
Same author

Altered stress hormone response following acute exercise during prostate cancer treatment.

Scandinavian journal of medicine & science in sports·2018
Same author

Four days of simulated shift work reduces insulin sensitivity in humans.

Acta physiologica (Oxford, England)·2018
Same author

Effects of Reduced Training on Muscular Power in Swimmers.

The Physician and sportsmedicine·2016
Same author

Placental restriction in multi-fetal pregnancies increases spontaneous ambulatory activity during daylight hours in young adult female sheep.

Journal of developmental origins of health and disease·2016

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • Dehydration during prolonged exercise can impair physiological function and reduce performance.
  • Understanding the impact of varying fluid replacement strategies is crucial for athletes and researchers.

Purpose of the Study:

  • To investigate the effects of different fluid ingestion rates on physiological markers and endurance performance during strenuous cycling exercise.
  • To determine the relationship between the degree of dehydration and exercise responses.

Main Methods:

  • Seven well-trained males performed 2 hours of cycling at 69% VO2 peak under three fluid replacement conditions: no fluid (NF), 100% replacement (FR-100), and 60% replacement (FR-60).
  • Following the initial 2 hours, participants completed a ride to exhaustion at 90% VO2 peak.

Related Experiment Videos

  • Physiological variables including heart rate, rectal temperature, plasma electrolytes, and hormones were monitored.

    • Main Results:

    • No fluid replacement (NF) led to 3.2% weight loss, while FR-100 resulted in 0.1% loss. FR-60 showed an 1.8% loss.
    • Heart rate and rectal temperature were significantly elevated in NF compared to FR-100 during the second hour of exercise.
    • Exercise time to exhaustion was significantly longer with FR-100 (328s) compared to NF (171s), with FR-60 (248s) showing intermediate results.

    Conclusions:

    • The amount of fluid ingested directly influences physiological responses like heart rate, rectal temperature, plasma sodium, and vasopressin levels during prolonged exercise.
    • Adequate fluid replacement (FR-100) is essential for maintaining physiological stability and enhancing subsequent exercise performance.
    • The degree of dehydration is a key determinant of physiological strain and endurance capacity during strenuous exercise in temperate conditions.