Abstract
Abstract This paper describes three experiments. The first experiment was designed to investigate the reason for the high heart rate of blind pedestrians when they travelled unaided over a route of medium difficulty. This experiment showed that if the blind subjects were guided over a route by a sighted person, the heart rate of the blind subjects was not significantly different from that of matched sighted control subjects. It was concluded that some form of psychological stress was responsible for the high heart rate of the blind pedestrians when they walked unaided and the use of the guided heart rate as a control measure, specific to each individual, is discussed. In the next two experiments, the results are given in terms of the percentage differences between the heart rate on unguided and guided trials and this measure has been termed the Stress Pulse Ratio (S.P.R.). The second experiment was designed to investigate the effect on heart rate of (a) the aid used by the blind pedestrian (the long cane ...
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