Faculty Advisor

Chon, Ki H.

Faculty Advisor

Mendelson, Yitzhak


The long duration and repetitive nature of watchstanding in the Navy triggers mental fatigue, which would cause a decline in working memory functions and response time. To minimize the damage caused by fatigue, it is necessary to understand how physiological parameters changes during the fatigue. According to recent researches, heart rate variability (HRV) can be calculated from photoplethysmogram (PPG) to indicate nervous system activity. N-back M-pitch, a cognitive working memory test was utilized to define the level of fatigue. An increase in fatigue was indicated by decrease in the accuracy of the test. In this project, HRV's high frequency area and low frequency area have been found correlated to mental fatigue and change over time as hypothesized.


Worcester Polytechnic Institute

Date Accepted

April 2012


Electrical and Computer Engineering


Biomedical Engineering

Project Type

Major Qualifying Project



Advisor Department

Biomedical Engineering

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