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Related Concept Videos

Physiology of Respiration I: Functions of the Respiratory System01:27

Physiology of Respiration I: Functions of the Respiratory System

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The respiratory system is crucial for exchanging oxygen (O2) and carbon dioxide (CO2) between the atmosphere and the bloodstream, maintaining the body's balance. Beyond gas exchange, it helps regulate acid-base balance, purify inhaled air, and enable vocalization.
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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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The respiratory system is comprised of the organs that enable breathing. Air enters the nostrils and mouth, followed by the pharynx (throat) and larynx (voice box), which lead to the trachea (windpipe). In the thoracic cavity, the trachea splits into two bronchi that allow air to enter the lungs. The bronchi split into progressively smaller bronchioles and terminate in small groups of tiny sacs in the lungs called alveoli, where gas exchange occurs.
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Updated: Feb 15, 2026

Conducting Maximal and Submaximal Endurance Exercise Testing to Measure Physiological and Biological Responses to Acute Exercise in Humans
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Respiratory Frequency during Exercise: The Neglected Physiological Measure.

Andrea Nicolò1, Carlo Massaroni2, Louis Passfield3,4

  • 1Department of Movement, Human and Health Sciences, University of Rome "Foro Italico", Rome, Italy.

Frontiers in Physiology
|January 12, 2018
PubMed
Summary

Respiratory frequency (fR) is an underutilized yet powerful metric for athlete training monitoring. This valuable physiological marker, measurable with wearable sensors, offers insights into physical effort and training intensity.

Keywords:
athletesbreathingefforttraining monitoringwearable sensors

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Area of Science:

  • Sports Science
  • Physiological Monitoring
  • Wearable Technology

Background:

  • Wearable sensor technology is increasingly used for athlete training monitoring.
  • Respiratory frequency (fR) is a vital sign measured by wearables in military, clinical, and occupational settings.
  • Current use of fR during exercise is limited, primarily for ventilatory threshold estimation.

Purpose of the Study:

  • To present evidence for the relevance of fR in training monitoring.
  • To critically review fR measurement methodologies and wearable accuracy.
  • To provide guidance on analyzing fR data for sports applications.

Main Methods:

  • Review of scientific literature on respiratory frequency and wearable sensors.
  • Analysis of existing data on fR during various exercise paradigms.
  • Critical evaluation of current wearable device accuracy for fR measurement.

Main Results:

  • fR is strongly associated with perceived exertion and performance-limiting factors like fatigue and hypoxia.
  • fR demonstrates rapid responses to workload variations, especially during high-intensity interval training (HIIT).
  • Existing wearable devices can measure fR with good accuracy, though it's underutilized.

Conclusions:

  • Respiratory frequency is a significant, yet overlooked, physiological marker for athlete training.
  • Further research and development in wearable fR monitoring can enhance training optimization.
  • Standardized methods for fR measurement and analysis are needed for broader adoption in sports.