Respiratory Disorders Non-invasive Monitoring of Work of Breathing in Outpatients

Inclusion Criteria: * Patient seen at the Stanford University Hospital Chest Clinic * Patient age 18 or older * Patient able to consent * Patient with one of the following two medical conditions: Chronic Obstructive Pulmonary - Disease or Asthma * Participant (or accompanying family / caretaker) able to speak English Exclusion Criteria: * Patient does not meet inclusion criteria (under age 18, unable to consent, etc.) * Patient is hospitalized * Patient is having an acute exacerbation of their respiratory condition * Patient is having an acute exacerbation of a comorbid condition * Patient has comorbid cardiac disease, including one of the conditions listed below: * Arrhythmias (including atrial fibrillation, NSVT, etc.) * Congestive Heart Failure * Unstable angina * Myocardial infarction within the last 3 months prior to enrollment * Uncorrected congenital heart disease * Uncorrected severe valvular disease * Pulmonary Hypertension (moderate or higher grade) * Patient has one of the following conditions: * Moderate pleural effusion * Large pleural effusion * Advanced stage lung cancer (Stage III or Stage IV disease) * Active infectious process, including viral process or pneumonia * Interstitial lung disease * Pleural disease, including pleural malignancies, trapped lung, etc * Active Cheyne-Stokes respiration * Patient has baseline increased work of breathing not due to their underlying respiratory disease (ie. COPD or asthma) * Ongoing substance abuse (not including cigarette use)