Application of Ergonomics of the Foot - Fundamentals and Assessment Tools for Occupational Ergonomics - page 602

FIGURE 30.4 Shoes.

C terrain coefficient

¼

¼ 1.0 for treadmill, blacktop road

¼ 1.1 for dirt road

1.2 for light brush

¼

1.3 for hard packed snow; C ¼ 1.3 þ 0.082 (foot depression, cm)

¼

1.5 for heavy brush

¼

1.8 for swamp

¼

2.1 for sand

¼

v velocity, m sec [for v 0.7 m sec (2.5 km h)]

¼ / . / /

The metabolic cost of carrying (walking with a load) depends on the load location. Soule and
Goldman (1980) reported that loads on the head used 1.2 times the energy of carrying a 1 kg of your
own body weight; in the hands, loads required 1.4-1.9 times as much; on the feet, loads required
4.2-6.3 times as much.
The energy cost of running is:

04V 2 RUNMET ¼ 142 = WT þ 11 þ 0 :

where RUNMET is the running metabolism (total), W kg, V is the velocity (km h), and WT is the

/ /

weight (body), in kg.

30.4.2 Standing
Although there are some problems with static electricity and with floor temperature, the primary
problem is lack of circulation in the leg.
Static electricity. Static electricity solutions include:

. Raise humidity above 40% (Not only permits voltage to flow to ground but also moisture is a lubri-
cator, reducing friction between moving parts.)
. Make carpets conductive (Carbon fibers added to carpets.)
. Put an antistatic floor mat under the operator's chair. Also can ground operator with a static-bleed
wrist strap
. Encourage cotton clothing; discourage nylons, slips, and polyester clothing. Use shoes with
static-dissipating soles
. Remove dust by blowing deionized air from an air gun