1. An investigation of the effect of light on diurnal leucocyte variations has been carried out on six healthy male subjects living under strictly controlled conditions.
2. The light reception usually associated with waking was delayed by keeping the subjects in darkness for 3 hr while the normal activity routine was maintained. The normal morning endogenous eosinopenia and lymphopenia were both much reduced and a marked but temporary neutropenia occurred. The most significant effect was the reduction of morning eosinopenia.
3. After emergence into light a further and prolonged decrease in both eosinophils and lymphocytes occurred. The daily minima were delayed by the 3 hr spent in darkness.
4. It is assumed that light controls, in part, the initial morning changes in leucocyte numbers.
5. The significance of these findings is discussed in relation to the mechanisms involved.
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Online ISSN: 1479-6805
Print ISSN: 0022-0795
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