The ‘Oxylog’: an evaluation

Harrison, M. H.; Brown, George; Belyavin, A.

doi:10.1080/00140138208925037

Cited by 50 publications

(13 citation statements)

References 4 publications

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“…Even though the face-mask was fitted very tighly, the re sults show that it gives obvious leaks in a minority of the subjects. This confirms that the problems with the original face-mask re ported by Harrison et al [4] during exercise may also occur at rest. It may be that small leakages of air into the mask occurred more frequently and systematically affected the Oxylog results in the remaining subjects.…”

Section: Discussionsupporting

confidence: 77%

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Comparison of a Face-Mask and a Mouthpiece for Measuring Resting Energy Expenditure with the ‘Oxylog’

Bukkens¹,

McNeill²

1990

Ann Nutr Metab

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Resting energy expenditure measurements were made simultaneously with an Oxylog and a ventilated hood indirect calorimeter, using (a) the Oxylog with the original oronasal face-mask and (b) the Oxylog with a mouthpiece and a noseclip, both in 15 subjects. The mean difference between Oxylog energy expenditure, when used with the mouthpiece, and ventilated hood measurements was very small: -0.4% (p < 0.4; n = 15). When used with the face-mask, the Oxylog tended to underestimate energy expenditure relative to the ventilated hood, the mean difference being -2.4% (p = 0.054; n = 13). In 2 subjects, the Oxylog face-mask showed obvious leaks. The subjects did not find the mouthpiece less comfortable than the face-mask, and there was no evidence that the mouthpiece disturbed respiration more than the face-mask. The Oxylog is therefore suitable for measurements of resting energy expenditure, but the use of a mouthpiece and noseclip is preferable to the use of the original Oxylog face-mask.

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Section: Discussionsupporting

confidence: 77%

“…Harrison et al [4] compared Oxylog oxygen consumption, using the supplied face-mask, with simulta neous mass spectrometer/dry gas meter mea surements during exercise. The face-mask was reported to be 'totally unsuitable' for use during exercise, because it tended to lift off in the upright position, causing substantial risk of leakage.…”

Section: Introductionmentioning

confidence: 99%

Comparison of a Face-Mask and a Mouthpiece for Measuring Resting Energy Expenditure with the ‘Oxylog’

Bukkens¹,

McNeill²

1990

Ann Nutr Metab

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“…Ballal and Macdonald (1982) found a very good agreement between parallel measurements with the OX andthe DB based on the mean values and the linear regression equation. Harrison et al (1982) reported significant mean underestimations by the OX (4 and 6%) as compared with the 'standard' method in their two experiments. The dependence between the methods was very high as seen by the regression equations.…”

Section: Practical Experiences With the Ox Under Field Conditionsmentioning

confidence: 91%

“…The OX (Humphrey and Wolff 1977, Ballal and Macdonald 1982, Harrison et al 1982consists of a halfface mask fitted with a turbine flow meter on the inspiratory side, and an expiratory hose connected to an analyser. The OX measures the volume of inspired air, the partial pressure of oxygen with two polarographic oxygen sensors for inspired and expired air, and air temperature.…”

Section: Introductionmentioning

confidence: 99%

Comparison of three field methods for measuring oxygen consumption

1985

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Michaelis gas meter.The Oxylog (OX) and the Kofranyi-Michaelis (KM) field methods for measuring oxygen consumption CV0 2 ) were compared with the conventional Douglas Bag (DB) technique in standardized walking and lifting work in the laboratory. Subjects comprised six men. According to the mean differences in V0 2 the OX underestimated (4-1% and 6'4%) and the KM overestimated (3-8% and 0'8%) V0 2 in walking and lifting work, respectively. The linear regression equations between the DB and the OX as well as between the DB and the KM revealed a good agreement (r= 0'91-{)'99)of the V0 2 values. The OX and the KM are accurate for reliable V0 2 measurements under field conditions. Some practical improvements for the qx use, based on several field studies, are recommended.

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“…The accuracy of the Oxylog has been validated in both laboratory and field tests that indicate the system is sufficiently accurate for field measurements of VE . (56,91) Likewise, the system appears to be well suited for studies in which duration and intensity of activities need to be well defined. (")…”

Section: 1mentioning

confidence: 99%

Workplace Breathing Rates: Defining Anticipated Values and Ranges for Respirator Certification Testing

Caretti¹,

Gardner²,

Coyne³

2004

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204. Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information N it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)2 SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION I AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTTest methods currently used by the National Institute for Occupational Safety and Health (NIOSH) are designed to assure that respirators meet a minimum level of efficacy when tested under standard laboratory protocols. For air-purifying respirators (APRs), the primary performance tests most affected by airflow rate are filter gas-life capacity, particulate filter efficiency, and respirator breathing resistances. Presently, NIOSH measures all three parameters using constant-rate airflow conditions. An analysis of the measured and estimated minute volumes contained in the literature indicated a range from about 8 to 162 L'min' for unencumbered ventilation and work activities that spanned from mild to exhaustive. The mean minute volume of the distribution was 38.5 ± 16.6 L'min-1, and the median was 33.6 L-minin. Based on an empirical relationship between minute volume and peak inspiratory flow (PIF), peak flows between 72 L'min-' and 183 L'min-1 would be expected for the mean minute volume for 38.5 L'min'. The anticipated range of PIF rates for the 9 5 dh percentile minute volume is between 182 L-min-' and 295 L-min-'. The results of this literature review suggest an increase in cyclic flow rates used for respirator certification testing should be considered to better represent ventilation rates found in the workplace. Blank EXECUTIVE SUMMARY Test methods currently used by the National Institute for Occupational Safety and Health (NIOSH) are designed to assure that all respirators of a given type will meet a minimum level of efficacy when tested under standard laboratory protocols. The relevance and adequacy of airflow rates used in respirator certification testing has been a longstanding debate. The concern is that the current test flow rates substantially underestimate real world values, implying that filters certified under existing standards may not provide adequate protection. For qualifying airpurifying respirators (APRs), the primar...

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The ‘Oxylog’: an evaluation

Cited by 50 publications

References 4 publications

Comparison of a Face-Mask and a Mouthpiece for Measuring Resting Energy Expenditure with the ‘Oxylog’

Comparison of a Face-Mask and a Mouthpiece for Measuring Resting Energy Expenditure with the ‘Oxylog’

Comparison of three field methods for measuring oxygen consumption

Workplace Breathing Rates: Defining Anticipated Values and Ranges for Respirator Certification Testing

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The ‘Oxylog’: an evaluation

Cited by 50 publications

References 4 publications

Comparison of a Face-Mask and a Mouthpiece for Measuring Resting Energy Expenditure with the &lsquo;Oxylog&rsquo;

Comparison of a Face-Mask and a Mouthpiece for Measuring Resting Energy Expenditure with the &lsquo;Oxylog&rsquo;

Comparison of three field methods for measuring oxygen consumption

Workplace Breathing Rates: Defining Anticipated Values and Ranges for Respirator Certification Testing

Contact Info

Product

Resources

About

Comparison of a Face-Mask and a Mouthpiece for Measuring Resting Energy Expenditure with the ‘Oxylog’

Comparison of a Face-Mask and a Mouthpiece for Measuring Resting Energy Expenditure with the ‘Oxylog’