Abstract
The effects of an impulsive glare of 4100 lx intensity upon the cardiovascular system are investigated in 22 normal males aged 25–40 years. This was part of a battery of reactive tests which included exposure to 90 dB noise and the cold pressor test. The blood pressure responses to glare were normally distributed. Values in terms of mean ± S.D. were as follows: maximum during glare 119±13·6/90·5 ± 13·7mmHg, mean during glare 114·2±12·2/86·0±12·4, maximum rise 9·5±7·8/13[mddot]7± 10·65 and mean change 4·2±6·0/8·7± 10·2. The maximum rise and mean change in both systolic and diastolic blood pressure differed very significantly from the immediately preceding baseline values. The maximal blood pressure response during glare did not differ significantly from that during exposure to noise or cold. Glare, however, elicited a significantly greater mean change in both systolic and diastolic blood pressure compared with noise. We conclude that exposure to an impulsive glare of car headlight intensity is stressful an...
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