Required Rest Time

Relaxation requirements to measures of fatigue

The equation below can be used to estimate required rest time in relation to work time and energy expenditure.

t_r = t_t (q_t - q_m) / (q_t - q_r)             (1)

where

t_r = required relaxation time (minutes)

t_t = task time (minutes)

q_t = task energy requirement (Watts)

q_m = maximum daily energy level with no recovery requirement (approximately 350 Watts for most male workers, approximately 300 Watts for most female workers)

q_r = resting energy (Watts) (commonly between 70 - 100 Watts)

Example - Required Relaxation Time

Required relaxation time for a male worker in very heavy work , task energy 600 W, resting energy 100 W and task time 60 min, can be calculated as

t_r = (60 min) ((600 W) - (350 W)) / ((600 W) - (100 W))

    = 30 min

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