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Related Concept Videos

Exercise and Muscle Performance01:27

Exercise and Muscle Performance

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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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Factors Affecting Respiration01:24

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Respiration is a crucial physiological function involving exchanging oxygen (O2) and carbon dioxide (CO2) between an organism and its environment. Various factors can impact this essential process:
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Mechanism of Breathing III: The Accessory Muscles01:21

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The Role of Accessory Muscles in the Respiratory System
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Hyperpnea and Hyperventilation01:25

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Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
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Respiratory Capacities01:24

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Respiratory capacities are crucial indicators of lung function, representing the maximum amount of air an individual's respiratory system can handle during various breathing phases.
One key metric is the Inspiratory Capacity (IC), which represents the maximum amount of air that can be inhaled with full effort. IC is calculated by summing the tidal volume and inspiratory reserve volume, typically ranging from 2.4 to 3.6 liters.
The Functional Residual Capacity (FRC) represents the air in the...
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Pulmonary Cycle: Exhalation01:17

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In terms of human respiration, the act of expelling air, known as exhalation (or expiration), operates on the principle of pressure gradients. During expiration, the pressure within the lungs exceeds that of the surrounding atmosphere. Under normal conditions, quiet breathing involves passive exhalation and is free of muscular contractions. This is because the exhalation process is driven by the natural elastic recoil of the lungs and chest wall, both of which have an inherent tendency to...
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Related Experiment Video

Updated: Mar 15, 2026

Inspiratory Muscle Training as an Adjunct to the Treatment of Weaning Failure in Critically Ill Patients: A Practical Guide
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Respiratory Muscle Training and Exercise Endurance at Altitude.

Samuel Helfer1, Joseph Quackenbush, Michael Fletcher

  • 1Center for Research and Education in Special Environments, Department of Physiology and Biophysics, School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA.

Aerospace Medicine and Human Performance
|September 17, 2016
PubMed
Summary

Voluntary isocapnic hyperpnea respiratory muscle training (VIHT) significantly improved exercise endurance at simulated altitude by 44%. This training method reduces respiratory muscle fatigue, benefiting trekkers and military personnel at high elevations.

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Area of Science:

  • Exercise physiology
  • Altitude training
  • Respiratory muscle function

Background:

  • Altitude exposure causes hypoxia and hyperventilation, potentially leading to respiratory muscle fatigue and reduced exercise capacity.
  • Voluntary isocapnic hyperpnea respiratory muscle training (VIHT) is known to enhance exercise endurance at sea level and depth.

Purpose of the Study:

  • To investigate the efficacy of VIHT in improving exercise time at simulated altitude (3600 m).
  • To compare the effects of VIHT against control and placebo groups in an altitude environment.

Main Methods:

  • Participants underwent simulated altitude exposure in a hypobaric chamber.
  • Exercise endurance was assessed using an ergometer until exhaustion.
  • Noninvasive measurements included arterial oxygen saturation (Sao2), ventilation (VE), and oxygen consumption (Vo2).

Main Results:

  • Exercise endurance increased by 44% (P = <0.001) after VIHT.
  • Maximal training ventilation (VE) increased by 40% post-VIHT.
  • Sustained VE during exercise was improved, with a greater increase for a longer duration and less decrease compared to pre-training.

Conclusions:

  • VIHT effectively improves exercise time at altitude.
  • The training reduces respiratory muscle fatigue, enhancing sustained ventilation.
  • VIHT is a potentially beneficial intervention for individuals working or recreating at high altitudes, including trekkers and military personnel.