Oxygen consumption and heart rate in different modes of manual postal delivery

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Abstract
O2 consumption (.ovrhdot.VO2) and heart rate (HR) was measured in 11 healthy men (mean age 34.5 yr) during 5 modes of simulated postal delivery: on level ground by foot, bicycle and push-cart, and on stairs by foot and push-cart. HR was measured telemetrically and samples of expired air were collected with a Kofranyi-Michaelis gas meter. Each delivery mode was performed twice; at the standard pace recommended by the postal authorities and at a free pace. .ovrhdot.VO2 and relative aerobic strain (RAS) were in the same level in on-foot and cart delivery, but HR was lower in cart than in on-foot delivery. In bicycle delivery .ovrhdot.VO2, RAS and HR were on the same level as in stairs/on-foot and stairs/with cart delivery but significantly higher than in on-foot and cart delivery on level ground. For all delivery modes the free pace resulted in significantly higher physiological stress and strain than the standard pace. The mean values of the different delivery modes varied from 1.0-1.71/min for .ovrhdot.VO2, from 30.6-54.3% for RAS and from 104-136 beats/min for HR. Maximal allowable delivery times (hour/day) were proposed with respect to age, sex, delivery mode and delivery pace.

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