Respiratory analyzer for exercise use
First Claim
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1. A respiratory analyzer for determining a respiratory parameter of a subject, comprising:
- a) a flow module, the flow module including;
a housing, enclosing a flow pathway through which respired gases pass as the subject breathes through the respiratory analyzer;
a flow meter, providing a flow signal correlated with a flow rate of gases through a portion of the flow pathway; and
a gas sensor, providing a gas sensor signal correlated with a partial pressure of a predetermined gas within the flow pathway; and
b) a computation module, the computation module being in data communication with the flow module, and operable to determine a respiratory parameter of the subject.
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Abstract
A respiratory analyzer comprises a flow module, having a flow tube through which the flow rate of gases is determined using a flow rate meter, and a computation module, in communication with the flow module, operable to determine a flow rate of respired gases. The computation module may also be operable to determine a metabolic rate of the subject.
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Citations
28 Claims
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1. A respiratory analyzer for determining a respiratory parameter of a subject, comprising:
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a) a flow module, the flow module including;
a housing, enclosing a flow pathway through which respired gases pass as the subject breathes through the respiratory analyzer;
a flow meter, providing a flow signal correlated with a flow rate of gases through a portion of the flow pathway; and
a gas sensor, providing a gas sensor signal correlated with a partial pressure of a predetermined gas within the flow pathway; and
b) a computation module, the computation module being in data communication with the flow module, and operable to determine a respiratory parameter of the subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A respiratory analyzer for determining a respiratory parameter of a subject, comprising:
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a respiratory connector, through which the subject breathes;
a flow module housing;
a flow tube within the flow module housing, partially enclosing a central flow pathway through which respired gases from the subject flow when the subject breathes through the respiratory analyzer, the flow tube having a first end and a second end;
a first ultrasonic transducer supported proximate to the first end of the flow tube;
a second ultrasonic transducer supported proximate to the second end of the flow tube, wherein the first and second ultrasonic transducers are operable to communicate ultrasonic signals through gases in the central flow pathway, and to provide flow rate signals correlated with a flow rate of gases in the central flow pathway;
an oxygen sensor providing an oxygen sensor signal correlated with a partial pressure of oxygen in the central flow pathway; and
a computation module, operable to determine the respiratory parameter of the subject, wherein the central flow pathway is in fluid communication with the respiratory connector through a first plurality of apertures disposed in proximity to the first end of the flow tube, and the central flow pathway is in fluid communication with atmospheric gas through a second plurality of apertures disposed in proximity to the second end of the flow tube. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A respiratory analyzer for determining a respiratory parameter of a subject, comprising:
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a respiratory connector, through which the subject breathes;
a filter module, in fluid communication with the respiratory connector, through which respired gases pass as the subject breathes through the respiratory analyzer, the filter module including a pathogen filter;
a flow tube, enclosing a central flow pathway, the flow tube having a first end and a second end, a first end portion proximate to the first end, and a second end portion proximate to the second end;
a chamber, in fluid communication with the filter module, surrounding the first end portion of the flow tube, the chamber and the central flow pathway being in fluid communication through one or more apertures in the first end portion of the flow tube;
a wind guard connected to an external surface of flow tube and having a flared portion extending beyond the second end of the flow tube, wherein the wind guard encloses an atmospheric chamber surrounding the second end portion of the flow tube, the atmospheric chamber opening to the atmosphere through an atmospheric aperture bounded by the wind guard and having a diameter greater than the external diameter of the flow tube, the atmospheric chamber and the central flow pathway being in fluid communication through one or more apertures in the second end portion of the flow tube;
a gas sensor, providing a gas sensor signal responsive to a partial pressure of a predetermined gas within the central flow pathway;
a flow meter, providing a flow meter signal correlated with a flow rate of gases within the central flow pathway; and
a computation module, receiving the flow meter signal and the gas sensor signal, and operable to compute the respiratory parameter of the subject. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method of determining a resting metabolic rate of a subject, the method including:
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providing the subject with a heart rate monitor;
determining heart rate of the subject over a period of time, during which the subject achieves a resting state;
determining a resting heart rate of the subject;
determining a measured metabolic rate of the subject over a measurement period;
determining a measurement heart rate of the subject over the measurement period;
determining the resting metabolic rate from the measured metabolic rate, the measurement heart rate, and the resting heart rate. - View Dependent Claims (26, 27)
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28. A method of determining an activity energy expenditure for a subject for an activity, comprising:
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determining a resting metabolic rate of the subject;
determining a resting heart rate of the subject;
determining an excess metabolic rate of the subject during a first performance of the activity and during a subsequent recovery time, wherein the excess metabolic rate is the metabolic rate of the subject minus the resting metabolic rate of the subject;
determining an excess heart rate for the subject during the first performance of the activity and during the subsequent recovery time, wherein the excess heart rate is the heart rate of the subject minus the resting heart rate of the subject;
integrating the excess metabolic rate so as to determine an activity energy expenditure for the first performance of activity;
integrating the excess heart rate so as to determine an activity excess heart beat number for the first performance of activity;
determining a correlation between the activity excess heart beat number and the activity energy expenditure;
determining a later activity energy expenditure for a later performance of the activity using heart rate data collected during the later performance of the activity and the correlation determined for the first performance of the activity.
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Specification