Ventilatory Capacity in Miners. A Five-year Follow-up Study

AUTOR(ES)

Higgins, I. T. T.

RESUMO

A five-year follow-up of ventilatory capacity in over 95% of a random sample of men living in the Rhondda Fach has been carried out. Miners and ex-miners with and without simple pneumoconiosis have been compared with non-mining controls, and the effect of ageing, mining, dust exposure, and tobacco smoking has been assessed. The change in Indirect Maximum Breathing Capacity (I.M.B.C.) between the two surveys appeared to be independent of age, suggesting that a linear decline in this function with age is a tenable hypothesis. An average decline of 1·865 ± 0·274 litres per minute each year in the I.M.B.C. was observed, and this fall was not significantly increased either by mining or by exposure to coal dust as measured by the number of years spent working underground.

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