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Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.
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Related Experiment Video

Updated: Jul 4, 2026

A Real-World High-Intensity Interval Training Protocol for Cardiorespiratory Fitness Improvement
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A Real-World High-Intensity Interval Training Protocol for Cardiorespiratory Fitness Improvement

Published on: February 22, 2022

[Fitness].

Astrid Høgedal1, Jonathan J Bjerre-Bastos1, Jacob Peter Hartmann2

  • 1Ortopædkirurgisk Afdeling, Københavns Universitetshospital - Bispebjerg Hospital.

Ugeskrift for Laeger
|July 3, 2026
PubMed
Summary
This summary is machine-generated.

Cardiorespiratory fitness, measured as VO₂max, is crucial for health and longevity. Maintaining physical activity enhances this fitness, reducing disease risk and promoting healthy aging.

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Published on: October 17, 2018

Area of Science:

  • Exercise Physiology
  • Preventive Medicine
  • Gerontology

Background:

  • Cardiorespiratory fitness (VO₂max) is a key indicator of physiological health.
  • Low VO₂max is strongly linked to increased morbidity and mortality.
  • Physical activity is essential for maintaining and improving VO₂max.

Purpose of the Study:

  • To highlight the significance of cardiorespiratory fitness (VO₂max) in predicting health outcomes.
  • To emphasize the role of regular physical activity in enhancing VO₂max.
  • To underscore the benefits of lifelong fitness for healthy aging and longevity.

Main Methods:

  • Review of existing literature on cardiorespiratory fitness and physical activity.
  • Analysis of VO₂max as a predictor of morbidity and mortality.
  • Examination of the physiological adaptations to regular exercise.

Main Results:

  • VO₂max is a potent independent predictor of disease and death.
  • Regular physical activity demonstrably improves cardiovascular and muscular function.
  • Increased VO₂max through exercise leads to reduced disease risk.

Conclusions:

  • Maintaining cardiorespiratory fitness throughout life is vital for promoting healthy aging.
  • Lifelong physical activity contributes to longevity and an improved quality of life.
  • Optimizing VO₂max is a critical strategy for public health and individual well-being.