Age and sex as determinants of the relative aerobic strain of nonmotorized mail delivery.

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Abstract
The relative aerobic strain (RAS) of nonmotorized mail delivery was assessed in 54 Finnish mail carriers who represented both sexes, the entire working range and downtown and surburban delivery districts. The mean RAS of the entire delivery time was 55% of the maximal O2 uptake (ml/kg .cntdot. min). It was higher for women than for men, and higher for suburban than for downtown delivery. The RAS tended to increase systematically with age after the age of 50. The work strain of mail carriers over 50 yr of age, especially of older women carriers in suburban areas, was high enough to lead to possible excessive strain on the workers.

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