Oronasal distribution of respiratory airflow

Niinimaa, V.; Cole, Philip; Shephard, Roy J.

doi:10.1016/0034-5687(81)90089-x

Cited by 169 publications

(65 citation statements)

References 8 publications

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“…As in previous studies (3,7,14,21,22,25,31), our laboratory has shown that the nasal contribution to breathing decreases with increasing exercise (Fig. 1).…”

Section: Discussionsupporting

confidence: 83%

“…Consequently, the air entering the lower respiratory tract is less conditioned and filtered of inhaled toxicants than it is otherwise (1, 9), thus subjecting the lower respiratory tract to potential insult. Others have also shown an average 50% nasal contribution to V E at a mean V E of 40 l/min (7,22,31). Whereas our data and that of others suggest that the %nasal contribution plateaus as total V E increases, absolute nasal ventilation rates may continue to rise, reaching mean peak values of 40 l/min (25).…”

Section: Discussioncontrasting

confidence: 58%

“…On a subsequent study day, the relative contributions of oral vs. nasal breathing were measured at rest and during incrementally graded submaximal exercise on the cycle ergometer (10% increments from 0-60% PWC max for each subject) (21,22). The subject was fitted with a nasal mask (Respironics, Murrysville, PA) (approximate dead space of 60 ml) that was similar to that used in pulmonary sleep laboratories and modified to allow insertion of a mass flowmeter (Korr Medical Technologies, Salt Lake City, UT) to detect nasal airflow (21,22).…”

Section: Methodsmentioning

confidence: 99%

“…The subject was fitted with a nasal mask (Respironics, Murrysville, PA) (approximate dead space of 60 ml) that was similar to that used in pulmonary sleep laboratories and modified to allow insertion of a mass flowmeter (Korr Medical Technologies, Salt Lake City, UT) to detect nasal airflow (21,22). Total ventilation (V E) was determined by respiratory inductance plethysmography (Respitrace) (calibrated by spirometry) (4,7,30).…”

Section: Methodsmentioning

confidence: 99%

“…The level of exercise at which the oronasal switching point occurs and the relative contributions of oral vs. nasal breathing at rest and during exercise have been studied by a number of investigators (3,7,14,21,22,25,27,31). The physiological determinants of the relative contributions to nasal and oral breathing during exercise are still not well understood.…”

mentioning

confidence: 99%

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Nasal contribution to breathing with exercise: effect of race and gender

Bennett

Zeman²,

Jarabek³

2003

Journal of Applied Physiology

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Because the nose acts as a filter to prevent penetration of toxic particles and gases to the lower respiratory tract, the route of breathing, oral vs. nasal, may be an important determinant of toxicant dose to the lungs. Using respiratory inductance plethysmography and a nasal mask fitted with flowmeter, we measured the nasal contribution to breathing at rest and during exercise (to 60% maximum workload) in healthy young adults (men/women = 11/11 and Caucasian/African-American = 11/11). We found that the nasal contribution to breathing is less during submaximal exercise in the Caucasians vs. African-Americans (e.g., at 60% maximum workload, mean nasal-to-total ventilation ratio = 0.40 ± 0.21 and 0.65 ± 0.24, respectively, P < 0.05). This difference is likely due to the African-Americans' ability to achieve higher maximal inspiratory flows through their nose than the Caucasians. Men also had a lesser nasal contribution to breathing during exercise compared with women. This is likely due to greater minute ventilations at any given percentage of maximum workload in men vs. women.

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“…As in previous studies (3,7,14,21,22,25,31), our laboratory has shown that the nasal contribution to breathing decreases with increasing exercise (Fig. 1).…”

Section: Discussionsupporting

confidence: 83%

Section: Discussioncontrasting

confidence: 58%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Nasal contribution to breathing with exercise: effect of race and gender

Bennett

Zeman²,

Jarabek³

2003

Journal of Applied Physiology

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Effects of Cleft Lip and Palate on the Nasal Airway in Children

Warren¹,

Hairfield²,

Dalston³

et al. 1988

Archives of Otolaryngology - Head and Neck Surgery

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Study of respirator effect on nasal-oral flow partition

1997

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Factors affecting worker tolerance of respiratory personal protective devices are inadequately understood. This study evaluates whether respirator‐type loads affected the switch from nasal to oral breathing. Eleven healthy subjects were studied under progressive exercise conditions, using a respirator full‐face mask with inspiratory resistance (I), pressure breathing (P) (10 cm H2O end‐expiratory pressure), or no load (N). A rapid‐response thermistor was used to determine whether flow was predominantly oral or nasal. Both P and I increased the percentage of time that breathing was predominantly oral. The effect was most pronounced at higher exercise levels. The percentage of mouth breathing appeared to be closely related to the expiratory time. This study suggests that nasal‐oral flow partitioning should be considered as a possible determinant of respirator tolerance. Am. J. Ind. Med. 32:408–412, 1997. © 1997 Wiley‐Liss, Inc.

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Oronasal distribution of respiratory airflow

Cited by 169 publications

References 8 publications

Nasal contribution to breathing with exercise: effect of race and gender

Nasal contribution to breathing with exercise: effect of race and gender

Effects of Cleft Lip and Palate on the Nasal Airway in Children

Study of respirator effect on nasal-oral flow partition

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