Studying Relationships between Human Posture and Health Risk Factors during Sedentary Activities Tejas Srinivasan Mentors: Vladimir Pavlovic Saehoon Yi

2 Problem With suboptimal posture, sedentary activities for long hours can create major health risks Can we discover causes for these health risks through analysis of posture and health of a subject throughout time?

Shimmer Sensors Wireless sensor platform Kinematic Sensing 3 Shimmer Sensors Wireless sensor platform Kinematic Sensing 3-axis accelerometer 3-axis gyro Biophysical Sensing Electrocardiography Electromyography Skin conductance / Galvanic skin response

4 Short-term Goals Figure out how to collect and interpret kinematic and biophysical data from Shimmer sensors Develop a system to classify posture from kinematic data Develop a system to classify health risks from biophysical data

5 Long-term Goals Design and execute experiments which can be used to infer information about postural characteristics and health throughout time Analyze data to discover relationships between postural characteristics and health risk factors in order to develop a model

6 Current State Testing and calibrating kinematic and biophysical sensors Collecting and interpreting kinematic data Configured a sensor to record gyroscope and accelerometer data Accelerometers measure the g-force (acceleration relative to an object in free-fall) in the frame of reference of the sensor, whose orientation can change Using gyroscope data, I want to obtain accurate acceleration data in the Earth frame I want to accurately separate the linear acceleration and gravitational acceleration components.

7 Possible uses Knowledge of the precise relationships between posture and health can yield superior ergonomic designs for work- spaces