Physiological parameters viz heart rate, respiration frequency and grip strength of working hand
were used for evaluating the table and chair height combinations, so that least stressful ones may be
recommended.
Polar heart rate monitor was used to record heart beats of the subjects. Expirograph (Toshniwal) was
used to measure respiration frequencies. Subjects were asked to respire through respiration tube into the
Spiro meter for one minute and the respiration peaks were recorded on the Kymograph paper with the help of
ink pointer. The speed of Kymograph was adjusted to 60 mm/min. The grip strength of working hand was
measured with the help of Grip Dynamometer.
Task of doing written assignment for 30 minutes was pre set. A pre developed and pre tested 3 point
scale of ‘Feeling of Discomfort’ was used to record subjective feelings of the subjects.