On the Study of Physiological Load of Worker While Working Forest Machine (3) . By Weeding Work

1989

S. 228-235

7 Abb., 3 Tab., 7 Lit. Ang.

Unselbständiges Werk

200062218

We studied the operational efficiency physiological load of worker during weeding by using two different tools (sickle and brush cutter) in three different sites (e.i. inclination angle are 0, 30, and 40 degree). 2 workers weeded about 7000 square meter of planted forest at Kyoto University Forest in Ashu for 4 days. We estimated the physiological load from heart rate by using H.R. Memory during work. First, we checked the relationships between heart rate and O2 uptake and energy expenditure simultaneously applying step test on each subjects, and next we calculated the physiological load during work in the Energy metabolism (cal/kg/min) and Relative Metabolic Rate (R.M.R.) using these relationships. Result: Physiological load was follows: in the case of using sickle, average heart rate of worker N is 117 beats/min, Energy metabolism is 116.27 cal/kg/min and R.M.R. is 3.9, and average heart of worker T is 139 beats/min, average Energy metabolism is 144.47 cal/kg/min and R.M.R. is 6.5. In the case of using brush cutter, average heart rate of worker N is 114 beats/min, Energy metabolism is 111.17 cal/kg/min and R.M.R. is 5.6, and average haert rate of worker T is 147 beats/min, average Energy metabolism is 157.92 cal/kg/min and R.M.R. is 7.2 (see Table 3). After we calculated about operational efficiency and energy metabolism by using analysis of variance, operational efficiency was significant about worker, and energy metabolism was significant about inclination angle (see Table 4).