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The muscles used for active exhalation are those that aid in the contraction of the thoracic cavity. The diaphragm is the main inspiratory muscle, and during exhalation, it relaxes, allowing the lungs to recoil and the thoracic cavity to decrease in size. During active expiration, the abdominal wall muscles, including the rectus abdominis, internal and external obliques, and transversus abdominis, contract and push up the diaphragm, raising alveolar pressure and driving air out. The internal intercostal muscles also play a role in forceful expiration, along with the subcostals and abdominal muscles.
| Characteristics | Values |
|---|---|
| Active exhalation is achieved by | Contraction of the abdominal wall muscles |
| The abdominal wall muscles include | Rectus abdominis, transverse abdominis, external oblique muscle, and internal oblique muscle |
| These muscles | Press the abdominal organs cranially (upward) into the diaphragm, reducing the volume of the thoracic cavity |
| During quiet breathing | Exhalation is predominantly passive, as the diaphragm relaxes and the elastic recoil of the lungs causes the thoracic cavity to contract, forcing air out of the lungs |
| During exercise | Expiratory muscles play an active role in breathing, contracting in coordination with the inspiratory rib cage muscles to prevent rib cage distortion and optimise breathing mechanics |
| The diaphragm | Lengthens and shortens the cavity by moving up and down, expanding and contracting the lungs |
| The rib cage muscles | Include the intercostals, parasternals, scalene, and neck muscles |
| The abdominal muscles | Include the rectus abdominis, internal and external obliques, and transversus abdominis |
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What You'll Learn
The diaphragm and intercostal muscles
The diaphragm is a thin, dome-shaped muscle located below the lungs, separating the abdominal cavity from the thoracic cavity. During inhalation, the diaphragm contracts and moves downwards, increasing the vertical diameter of the thoracic cavity, which in turn, expands the lungs, drawing air into them. When the diaphragm relaxes during exhalation, the thoracic cavity returns to its original shape, and air is forced out of the lungs.
The intercostal muscles are another important group of respiratory muscles. There are three types of intercostal muscles: external, internal, and innermost. The external intercostal muscles are the most important in respiration. These muscles are attached between the ribs and are responsible for manipulating the width of the rib cage. The contraction of these fibres raises each rib toward the rib above, with the overall effect of raising the rib cage, assisting in inhalation. The internal intercostal muscles have fibres that are angled obliquely downward and backward from rib to rib. During forced exhalation, these muscles pull the ribs down and in, decreasing the volume of the thorax, forcing air out more quickly.
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Abdominal muscles
The abdominal muscles are one of the three groups of respiratory muscles, along with the diaphragm and the rib cage muscles. The abdominal muscles act on the abdomen and the abdominal rib cage and are expiratory.
During normal expiration, the diaphragm and external intercostals relax, and air is expelled from the lungs as the thoracic cavity contracts due to the elastic recoil of the muscles and lungs. This process is passive, requiring little to no muscle contraction. However, during exercise, the expiratory muscles, including the abdominal muscles, play an active role in breathing.
The abdominal muscles that aid in active exhalation include the rectus abdominis, external oblique, internal oblique, and transversus abdominis. The rectus abdominis pulls the ribs down during active expiration, increasing intra-abdominal pressure and pushing the diaphragm upwards. The external oblique and internal oblique muscles also contribute to active exhalation, with their activity increasing during high-intensity exercise.
During exercise, the abdominal muscles contract during exhalation, while the rib cage muscles contract during inhalation. This mechanism prevents rib cage distortion, unloads the diaphragm, and optimises the mechanics of breathing. The abdominal muscles also help regulate the ventilatory response to intense exercises like cycling, ensuring adequate lung emptying and maintenance of end-expiratory lung volume.
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Active exhalation during exercise
The diaphragm is the primary muscle responsible for breathing, and it plays a crucial role in both inhalation and exhalation. During inhalation, the diaphragm contracts and moves downward, allowing the lungs to expand and draw in air. When we exhale, the diaphragm relaxes, and the lungs return to their resting state, with the diaphragm resuming its dome shape.
During exercise, the expiratory muscles become actively involved in breathing, working in coordination with the inspiratory rib cage muscles. This mechanism helps prevent rib cage distortion, optimises the diaphragm's function as a flow generator, and decreases the volume of the abdomen.
The timing of breathing during exercise varies depending on the type of activity. For example, there is no standard convention for breathing while running, but weight lifting exercises typically follow a pattern of exhaling during exertion and inhaling during the reset. Proper breathing techniques during exercise can help regulate pressure build-up in the chest and abdomen, reducing the risk of internal injuries.
Additionally, breathing patterns can be used to maximise oxygen uptake by the body or to regulate the build-up of pressure during inhalation. Practising proper breathing techniques during exercise can improve performance, increase control, and enhance overall fitness.
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Exhalation as a passive process
Exhalation, or expiration, is the process by which air leaves the lungs. During quiet breathing, exhalation is a passive process driven by the elastic recoil of the lungs. When the diaphragm relaxes, the lungs' elastic recoil causes the thoracic cavity to contract, forcing air out of the lungs. This process does not require muscle contraction or energy to push air out of the lungs.
The diaphragm is the major muscle responsible for breathing and plays a crucial role in both inhalation and exhalation. During inhalation, the diaphragm contracts, moving downward and increasing the volume of the thoracic cavity, which in turn expands the lungs. This expansion draws air into the lungs. During exhalation, the diaphragm relaxes, allowing the elastic recoil of the lungs to force air out.
The intercostal muscles, particularly the external intercostals, also play a significant role in respiration. These muscles are attached between the ribs and assist in manipulating the width of the rib cage. During inhalation, the contraction of the external intercostal muscles moves the ribs upward and outward, expanding the rib cage and thoracic cavity. This expansion increases the volume of the thoracic cavity, creating a pressure gradient that draws air into the lungs. During exhalation, the relaxation of the intercostal muscles, along with the diaphragm, allows for the passive exhalation of air.
The abdominal muscles, including the rectus abdominis, external oblique, internal oblique, and transversus abdominis, are also involved in respiration. During inhalation, the abdominal muscles relax, allowing the diaphragm to expand the abdomen and lower rib cage. During exhalation, the contraction of the abdominal muscles can assist in forcing air out of the lungs, particularly during forceful exhalation or when lung elasticity is reduced.
In summary, exhalation is typically a passive process driven by the elastic recoil of the lungs and the diaphragm's relaxation. The intercostal and abdominal muscles also contribute to exhalation, but their main role is during inhalation, where they assist in expanding the rib cage and abdomen, respectively. During quiet breathing, exhalation occurs without the need for active muscle contraction.
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The role of accessory muscles
Accessory muscles are additional muscles that the body uses to help inhale and exhale air into the lungs. These muscles are not used during regular breathing for a person in good health. However, they are used during deep breathing or in response to respiratory challenges. They are also used during exercise due to the increased metabolic need and during dysfunction in the respiratory system.
The accessory muscles used during exhalation include the abdominal muscles: rectus abdominis, external oblique, internal oblique, and transversus abdominis. These muscles contract to push up against the diaphragm, helping to expel air more forcefully. This is particularly important during vigorous physical activity or coughing, when forceful exhalation is required. In the thoracolumbar region, the lowest fibres of iliocostalis and longissimus, the serratus posterior inferior and quadratus lumborum are also accessory expiratory muscles.
The diaphragm is the main inspiratory muscle and is also involved in exhalation. During inspiration, the diaphragm contracts and moves downward, increasing the vertical diameter of the thoracic cavity and producing lung expansion, drawing air into the lungs. During exhalation, the diaphragm relaxes, and the elastic recoil of the lungs causes the thoracic cavity to contract, forcing air out of the lungs.
The intercostal muscles are another important group of respiratory muscles. These muscles are attached between the ribs and help manipulate the width of the rib cage. There are three layers of intercostal muscles: external, internal, and innermost. The external intercostal muscles are the most important in respiration, with fibres that are angled obliquely downward and forward from rib to rib. The contraction of these fibres raises each rib toward the rib above, raising the rib cage and assisting in inhalation. During exhalation, the intercostal muscles relax, reducing the space in the chest cavity and facilitating the expulsion of air from the lungs.
Other accessory muscles that may be involved in respiration include the scalenes (anterior, middle, and posterior), serratus anterior, pectoralis major and pectoralis minor, trapezius, latissimus dorsi, erector spinae, levatores costarum, transversus thoracis, and subclavius. These muscles may be activated during increased respiratory volume or when breathing in at the maximal flow rate.
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Frequently asked questions
The abdominal muscles are the primary muscles involved in active exhalation, specifically the rectus abdominis, internal and external obliques, and transversus abdominis.
The abdominal muscles act on the abdomen and abdominal rib cage, pushing the abdominal organs upwards into the diaphragm, reducing the volume of the thoracic cavity and forcing air out of the lungs.
Active exhalation occurs during exercise, playing an instrument, or when forceful exhalation is required, such as in cases of reduced lung elasticity.
During quiet breathing, exhalation is passive, as the respiratory muscles relax and the lungs and chest wall return to their resting volume. In contrast, active exhalation requires the contraction of abdominal muscles to assist in forcing air out of the lungs.
The internal intercostal muscles are also recruited during active exhalation. They pull the ribs downwards and inwards, further reducing the size of the thoracic cavity.
