Presentation Title

Reliability and Validity of a Locomotor-Respiratory Measurement Device

Advisor Information

Jenna Yentes

Location

Dr. C.C. and Mabel L. Criss Library

Presentation Type

Poster

Start Date

6-3-2015 9:00 AM

End Date

6-3-2015 10:30 AM

Abstract

The purpose of this experiment was to test the reliability and validity of two sensors simultaneously measuring locomotion and respiratory patterns. A wireless accelerometer was used to measure locomotion patterns and a capacitance sensor was used to measure respiratory patterns on one male human subject. All IRB # protocols were followed. The device containing the two sensors was tested against a commercially available 3-dimensional motion capture system. The position of the lateral malleolus was used as a comparison for the accelerometer since the two were mounted close together. The distance between two other markers placed on the C7 (back of the neck) and manubrium (middle of the sternum) to use as a comparison with the capacitive breathing sensor. Means and standard deviations of the stride times calculated from the motion capture system and accelerometer were compared and determined to be valid, but the accelerometer was not as reliable. This is likely for two reasons: the sampling rate of the accelerometer was lower than the 3-dimensional motion capture and the accelerometer was not tightly attached to the ankle, which introduced noise into the desired signal. Breath times and number of breaths were calculated from both the capacitance sensor and 3-dimensional marker data. The capacitance sensor was determined to be had the same number of breaths and similar breath times when compared to the 3-dimensional motion capture data. Thus, the breathing sensor was determined to have similar validity and reliability as the method used to measure breathing with the motion capture system.

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COinS
 
Mar 6th, 9:00 AM Mar 6th, 10:30 AM

Reliability and Validity of a Locomotor-Respiratory Measurement Device

Dr. C.C. and Mabel L. Criss Library

The purpose of this experiment was to test the reliability and validity of two sensors simultaneously measuring locomotion and respiratory patterns. A wireless accelerometer was used to measure locomotion patterns and a capacitance sensor was used to measure respiratory patterns on one male human subject. All IRB # protocols were followed. The device containing the two sensors was tested against a commercially available 3-dimensional motion capture system. The position of the lateral malleolus was used as a comparison for the accelerometer since the two were mounted close together. The distance between two other markers placed on the C7 (back of the neck) and manubrium (middle of the sternum) to use as a comparison with the capacitive breathing sensor. Means and standard deviations of the stride times calculated from the motion capture system and accelerometer were compared and determined to be valid, but the accelerometer was not as reliable. This is likely for two reasons: the sampling rate of the accelerometer was lower than the 3-dimensional motion capture and the accelerometer was not tightly attached to the ankle, which introduced noise into the desired signal. Breath times and number of breaths were calculated from both the capacitance sensor and 3-dimensional marker data. The capacitance sensor was determined to be had the same number of breaths and similar breath times when compared to the 3-dimensional motion capture data. Thus, the breathing sensor was determined to have similar validity and reliability as the method used to measure breathing with the motion capture system.