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

Strenuous prolonged exercise elevates resting metabolic rate and causes reduced mechanical efficiency.

R Bahr1, P K Opstad, J I Medbø

  • 1Department of Physiology, National Institute of Occupational Health, Oslo, Norway.

Acta Physiologica Scandinavica
|April 1, 1991
PubMed
Summary

Severe physical stress, sleep deprivation, and food restriction significantly increase resting and exercise oxygen uptake in army cadets. Mechanical efficiency decreased, while excess post-exercise oxygen consumption (EPOC) increased under these conditions.

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

The Effect of an 8-Week Low- or High-Volume Protocol of the Adductor Strengthening Programme on Hip Adduction Strength in Female Football Players-A Randomized Trial.

Scandinavian journal of medicine & science in sports·2025
Same author

#ReadyToplay: hamstring injuries in women's football - a two-season prospective cohort study in the Norwegian women's premier league.

Science & medicine in football·2024
Same author

Hosting international sporting events during the COVID-19 pandemic: lessons learnt and looking forward.

British journal of sports medicine·2022
Same author

Introducing a new method to record injuries during military training: a prospective study among 296 young Norwegian conscripts.

BMJ military health·2022
Same author

Characteristics of functional movement screening testing in elite handball players: Indicative data from the 9.

Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine·2019
Same author

Evidence for heterogeneous subsarcolemmal Na<sup>+</sup> levels in rat ventricular myocytes.

American journal of physiology. Heart and circulatory physiology·2019

Area of Science:

  • Exercise Physiology
  • Human Performance
  • Metabolic Stress

Background:

  • Military training simulations impose extreme physical and psychological stress.
  • Understanding the metabolic consequences of sustained combat exercises is crucial for soldier performance and health.

Purpose of the Study:

  • To investigate the impact of simulated combat stress on metabolic responses during submaximal exercise.
  • To assess changes in resting oxygen consumption, mechanical efficiency, and excess post-exercise oxygen consumption (EPOC).

Main Methods:

  • 15 army cadets underwent testing during a simulated combat exercise (3-4 days) and after recovery.
  • Measurements included resting O2 consumption, net mechanical efficiency during cycling, and EPOC at a standardized workload.
  • Respiratory exchange ratio (R-value) was used to assess substrate utilization.

Related Experiment Videos

Main Results:

  • Resting O2 consumption increased by 15% under stress conditions (P < 0.001).
  • Net mechanical efficiency decreased significantly (P < 0.001), and EPOC increased (P < 0.05).
  • A shift towards fat utilization was observed, indicated by a lower R-value during exercise.

Conclusions:

  • Severe physical stress combined with sleep and food restriction elevates oxygen uptake at rest and during exercise.
  • Reduced mechanical efficiency and increased EPOC suggest impaired metabolic function under prolonged stress.
  • These findings highlight the significant physiological burden of extreme training environments.