Pulmonary function subsequent to expiratory muscle fatigue in healthy humans

H. C. Haverkamp, M. Metelits, J. Hartnett, K. Olsson, Richard J Coast

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

One of the mechanisms proposed to explain the decrement in pulmonary function often seen after exercise is fatigue of the expiratory muscles. To test the hypothesis that expiratory muscle fatigue alters lung function, several indices of pulmonary function were measured before and after expiratory muscle fatigue was induced by expiratory loaded breathing. Eight subjects completed a fatigue trial (EF) in which expiratory threshold loaded breathing was performed at an initial resistance equal to 80% of their maximal expiratory pressure (MEP), at a respiratory rate of 13 bpm, and a duty cycle (T1/TTot) of 0.33. MEP was taken at predefined intervals throughout the loaded breathing protocol, and loaded breathing was discontinued when MEP was less than 80% of each subject's pre EF trial MEP (TLim). FVC, FEV1.0, FEF25%, FEF25-75%, and maximal inspiratory and expiratory pressures (MIP and MEP) were taken prior to, immediately after, and at 5, 10, and 15 min post fatigue. On a separate day a control trial (CON) was performed that was identical to each subjects EF trial with the exception that no expiratory load was utilized. At TLim MEP was significantly reduced (p < 0.001) by 23.5% from the pre-expiratory loaded breathing value (183.1 ± 39.56 to 140.13 ± 30.45 mmHg), whereas it remained unchanged during the CON trial (191.06±44.18 to 188.06±43.50 mmHg). FVC measured prior to and immediately after TLim remained unchanged following both the EF (5349.45±1130.8 to 5387.43±1139.92 mL) and CON trials (5287.75±1220.29 and 5352.78±1191.30 mL). These results suggest that any expiratory muscle fatigue developed during exercise by itself does not result in altered pulmonary function. However, any interactions between expiratory muscle fatigue and other consequences of exercise that may alter lung function cannot be ruled out.

Original languageEnglish (US)
Pages (from-to)498-503
Number of pages6
JournalInternational Journal of Sports Medicine
Volume22
Issue number7
DOIs
StatePublished - 2001
Externally publishedYes

Fingerprint

Muscle Fatigue
Lung
Respiration
Fatigue
Maximal Respiratory Pressures
Respiratory Rate

Keywords

  • Endurance exercise
  • Expiratory loaded breathing
  • Expiratory muscle fatigue
  • Pulmonary function

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Pulmonary function subsequent to expiratory muscle fatigue in healthy humans. / Haverkamp, H. C.; Metelits, M.; Hartnett, J.; Olsson, K.; Coast, Richard J.

In: International Journal of Sports Medicine, Vol. 22, No. 7, 2001, p. 498-503.

Research output: Contribution to journalArticle

Haverkamp, H. C. ; Metelits, M. ; Hartnett, J. ; Olsson, K. ; Coast, Richard J. / Pulmonary function subsequent to expiratory muscle fatigue in healthy humans. In: International Journal of Sports Medicine. 2001 ; Vol. 22, No. 7. pp. 498-503.
@article{15530cdde193475bb6f5fcf39fe7bb6d,
title = "Pulmonary function subsequent to expiratory muscle fatigue in healthy humans",
abstract = "One of the mechanisms proposed to explain the decrement in pulmonary function often seen after exercise is fatigue of the expiratory muscles. To test the hypothesis that expiratory muscle fatigue alters lung function, several indices of pulmonary function were measured before and after expiratory muscle fatigue was induced by expiratory loaded breathing. Eight subjects completed a fatigue trial (EF) in which expiratory threshold loaded breathing was performed at an initial resistance equal to 80{\%} of their maximal expiratory pressure (MEP), at a respiratory rate of 13 bpm, and a duty cycle (T1/TTot) of 0.33. MEP was taken at predefined intervals throughout the loaded breathing protocol, and loaded breathing was discontinued when MEP was less than 80{\%} of each subject's pre EF trial MEP (TLim). FVC, FEV1.0, FEF25{\%}, FEF25-75{\%}, and maximal inspiratory and expiratory pressures (MIP and MEP) were taken prior to, immediately after, and at 5, 10, and 15 min post fatigue. On a separate day a control trial (CON) was performed that was identical to each subjects EF trial with the exception that no expiratory load was utilized. At TLim MEP was significantly reduced (p < 0.001) by 23.5{\%} from the pre-expiratory loaded breathing value (183.1 ± 39.56 to 140.13 ± 30.45 mmHg), whereas it remained unchanged during the CON trial (191.06±44.18 to 188.06±43.50 mmHg). FVC measured prior to and immediately after TLim remained unchanged following both the EF (5349.45±1130.8 to 5387.43±1139.92 mL) and CON trials (5287.75±1220.29 and 5352.78±1191.30 mL). These results suggest that any expiratory muscle fatigue developed during exercise by itself does not result in altered pulmonary function. However, any interactions between expiratory muscle fatigue and other consequences of exercise that may alter lung function cannot be ruled out.",
keywords = "Endurance exercise, Expiratory loaded breathing, Expiratory muscle fatigue, Pulmonary function",
author = "Haverkamp, {H. C.} and M. Metelits and J. Hartnett and K. Olsson and Coast, {Richard J}",
year = "2001",
doi = "10.1055/s-2001-17612",
language = "English (US)",
volume = "22",
pages = "498--503",
journal = "International Journal of Sports Medicine",
issn = "0172-4622",
publisher = "Georg Thieme Verlag",
number = "7",

}

TY - JOUR

T1 - Pulmonary function subsequent to expiratory muscle fatigue in healthy humans

AU - Haverkamp, H. C.

AU - Metelits, M.

AU - Hartnett, J.

AU - Olsson, K.

AU - Coast, Richard J

PY - 2001

Y1 - 2001

N2 - One of the mechanisms proposed to explain the decrement in pulmonary function often seen after exercise is fatigue of the expiratory muscles. To test the hypothesis that expiratory muscle fatigue alters lung function, several indices of pulmonary function were measured before and after expiratory muscle fatigue was induced by expiratory loaded breathing. Eight subjects completed a fatigue trial (EF) in which expiratory threshold loaded breathing was performed at an initial resistance equal to 80% of their maximal expiratory pressure (MEP), at a respiratory rate of 13 bpm, and a duty cycle (T1/TTot) of 0.33. MEP was taken at predefined intervals throughout the loaded breathing protocol, and loaded breathing was discontinued when MEP was less than 80% of each subject's pre EF trial MEP (TLim). FVC, FEV1.0, FEF25%, FEF25-75%, and maximal inspiratory and expiratory pressures (MIP and MEP) were taken prior to, immediately after, and at 5, 10, and 15 min post fatigue. On a separate day a control trial (CON) was performed that was identical to each subjects EF trial with the exception that no expiratory load was utilized. At TLim MEP was significantly reduced (p < 0.001) by 23.5% from the pre-expiratory loaded breathing value (183.1 ± 39.56 to 140.13 ± 30.45 mmHg), whereas it remained unchanged during the CON trial (191.06±44.18 to 188.06±43.50 mmHg). FVC measured prior to and immediately after TLim remained unchanged following both the EF (5349.45±1130.8 to 5387.43±1139.92 mL) and CON trials (5287.75±1220.29 and 5352.78±1191.30 mL). These results suggest that any expiratory muscle fatigue developed during exercise by itself does not result in altered pulmonary function. However, any interactions between expiratory muscle fatigue and other consequences of exercise that may alter lung function cannot be ruled out.

AB - One of the mechanisms proposed to explain the decrement in pulmonary function often seen after exercise is fatigue of the expiratory muscles. To test the hypothesis that expiratory muscle fatigue alters lung function, several indices of pulmonary function were measured before and after expiratory muscle fatigue was induced by expiratory loaded breathing. Eight subjects completed a fatigue trial (EF) in which expiratory threshold loaded breathing was performed at an initial resistance equal to 80% of their maximal expiratory pressure (MEP), at a respiratory rate of 13 bpm, and a duty cycle (T1/TTot) of 0.33. MEP was taken at predefined intervals throughout the loaded breathing protocol, and loaded breathing was discontinued when MEP was less than 80% of each subject's pre EF trial MEP (TLim). FVC, FEV1.0, FEF25%, FEF25-75%, and maximal inspiratory and expiratory pressures (MIP and MEP) were taken prior to, immediately after, and at 5, 10, and 15 min post fatigue. On a separate day a control trial (CON) was performed that was identical to each subjects EF trial with the exception that no expiratory load was utilized. At TLim MEP was significantly reduced (p < 0.001) by 23.5% from the pre-expiratory loaded breathing value (183.1 ± 39.56 to 140.13 ± 30.45 mmHg), whereas it remained unchanged during the CON trial (191.06±44.18 to 188.06±43.50 mmHg). FVC measured prior to and immediately after TLim remained unchanged following both the EF (5349.45±1130.8 to 5387.43±1139.92 mL) and CON trials (5287.75±1220.29 and 5352.78±1191.30 mL). These results suggest that any expiratory muscle fatigue developed during exercise by itself does not result in altered pulmonary function. However, any interactions between expiratory muscle fatigue and other consequences of exercise that may alter lung function cannot be ruled out.

KW - Endurance exercise

KW - Expiratory loaded breathing

KW - Expiratory muscle fatigue

KW - Pulmonary function

UR - http://www.scopus.com/inward/record.url?scp=0034775765&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034775765&partnerID=8YFLogxK

U2 - 10.1055/s-2001-17612

DO - 10.1055/s-2001-17612

M3 - Article

VL - 22

SP - 498

EP - 503

JO - International Journal of Sports Medicine

JF - International Journal of Sports Medicine

SN - 0172-4622

IS - 7

ER -