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Related Concept Videos

Exercise and Muscle Performance01:27

Exercise and Muscle Performance

Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
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Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
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Cellular Adaptation II: Hypertrophy

Hypertrophy is the increase in the size of individual cells, resulting in the enlargement of a tissue or organ. Unlike hyperplasia, which involves an increase in cell number, hypertrophy is characterized by an increase in cell volume. This process often occurs in response to higher functional demand or hormonal stimulation, leading to the production of more structural proteins and organelles, thereby enhancing the cells' work capacity.There are two primary types of hypertrophy: physiological...
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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
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Cells can adapt to environmental changes to maintain function and avoid injury, a process called cellular adaptation. Adapted cells exist in a reversible intermediate state with changes in size, number, phenotype, metabolism, or function. These responses help cells meet altered physiological or pathological demands; for example, enlargement of breast and uterine tissues during pregnancy. Early adaptations may enhance function, but persistent stress eventually causes tissue damage.Types of...

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Updated: May 9, 2026

A Real-World High-Intensity Interval Training Protocol for Cardiorespiratory Fitness Improvement
08:27

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

Published on: February 22, 2022

Physiological and performance adaptations to high-intensity interval training.

Martin J Gibala1, Andrew M Jones

  • 1Department of Kinesiology, McMaster University, Hamilton, ON, Canada.

Nestle Nutrition Institute Workshop Series
|August 1, 2013
PubMed
Summary
This summary is machine-generated.

High-intensity interval training (HIIT) significantly improves exercise capacity and muscle oxidative capacity in untrained individuals with minimal time. For athletes, HIIT supplementation enhances performance, potentially through different mechanisms than in less trained subjects.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Metabolic Adaptations

Background:

  • High-intensity interval training (HIIT) involves short bursts of intense exercise with recovery periods.
  • HIIT offers physiological benefits comparable to traditional endurance training but with less volume and time.
  • It is effective for both untrained individuals and well-trained athletes seeking performance enhancement.

Purpose of the Study:

  • To summarize the physiological effects of HIIT on exercise capacity and skeletal muscle adaptations.
  • To explore the efficacy of HIIT in improving performance in both untrained and elite endurance athletes.
  • To discuss the potential optimal training intensity distribution for endurance athletes.

Main Methods:

  • Review of studies examining the effects of short-term HIIT on untrained individuals.
  • Analysis of research on supplementing HIIT into the training of well-trained endurance athletes.
  • Discussion of training intensity distribution models, including polarized training.

Main Results:

  • As few as six HIIT sessions (∼15 min intense exercise) in 14 days enhance exercise capacity and skeletal muscle oxidative capacity in untrained individuals.
  • HIIT supplementation (replacing 15-25% of training) improves performance in well-trained athletes, possibly via different mechanisms.
  • A polarized training approach (75% low intensity, 10-15% high intensity) may be optimal for elite endurance athletes.

Conclusions:

  • HIIT is a time-efficient method for improving physiological markers of fitness in various populations.
  • The benefits and underlying mechanisms of HIIT may differ between untrained individuals and elite athletes.
  • Optimizing training intensity distribution, potentially through a polarized model, is crucial for elite endurance performance.