lungfit: phase 1 preliminary data by: christen chan, msc candidate

LungFIT: Phase 1 Preliminary Data

By: Christen Chan, MSc Candidate

Study Purpose

• To test the reliability and validity of the LungFIT system measuring heart rate, oxygen saturation, and distance in healthy adults.–Gain feedback on the presentation, ease of use,

and functionality of the LungFIT system–Compare the 3 different probes (Nonin,

Masimo, LionsGate Technologies)

Sample Population

• 15 adults 35 + years old to match COPD population– As well as generation’s typical smartphone use

• Speak and read English• State they can walk unassisted for 1 hour• Free of diagnosed respiratory, hypertension, or

cardiovascular disease• No uncontrolled, severe, or exercise induced asthma• No physical disability/injury to body, limbs or hands• Answered ‘NO’ to all questions on the PAR-Q

questionnaire

Methods - Study Introduction

• Consent form followed by PAR-Q form• Baseline measures: age, sex, height, weight,

smoking status, smoking history (pack-years), experience with smartphones, and relevant medical information• After 15 minutes of sitting: resting heart rate

and oxygen saturation from pulse oximeter

Methods – Functionality Test

1. Orientation manual of the LungFIT explained2. Time-to-complete test3. Administer the adapted Mobile Phone

Usability Questionnaire (Ryu & Smith-Jackson, 2006)

3 LungFITs

Cosmed K4b2Nonin PulseOximeter

12-Lead ECG

Cycle ergometer

Methods – Exercise Tests• Cycle Ergometer Test: Cycle at 60-70 RPM for 5

minutes, intensity of 50 Watts with a RPE at or below 4

• Treadmill Test: Walk at 3km/hr for 5 minutes• Outdoor Walking Test: Walk 1 lap of a measured

course at an outdoor park (362 metres)

• Reliability testing: Each exercise test will be repeated 3 consecutive times with 3 minute breaks in between each set.

Results – Sample CharacteristicsCharacteristic Value Standard Deviation

Subjects (n) 15

Age 47.20 7.54

Sex 10 Female/5 Male

Height (cm) 167.33 9.96

Weight (Kg) 73.66 16.25

Smoking Status Never Smoker=8

Ex-Smoker=6

Active Smoker=1

Smoking History (pack years) 1.76 3.86

Smartphone Experience Novice=1

Intermediate=1

Advanced=10

Expert=3

Resting Heart Rate 68.27 14.64

Resting Oxygen Saturation 96.40 1.40

Results – Usability Questionnaire• Overall, all sections scored well• It is easy for you to remember how to perform

tasks with this system? 15/15• It is easy to set up the LungFIT system? 15/15• It is easy to take corrective actions once an error

has been recognized? 13/15• Are the response time and information display

fast enough? 15/15• Has the LungFIT system at some time stopped

unexpectedly? 1/15

Cycle Ergometer Test

• Measures were not recorded if there was a weak signal quality

• Total ‘missed’ values:– Nonin: 13– Masimo: 2– LionsGate Technologies: 10

Treadmill Walking Test

• Total ‘missed’ values:–Nonin: 3–Masimo: 4– LionsGate Technologies: 6