ractor is a basic power source for farmers because of its capacity in delivering low-pressure and high-efficiency works (Goering and Hansen, 2004). However, previous studies revealed that the improper design of workplace could intensify problems related to the safety, comfort, and in some cases, health (Fathallah et al., 2009; Hsiao et al., 2005; Kumar et al., 2009; Monarca et al., 2009). Occupational musculoskeletal injuries were identified as significant health problems among tractor operators (Bovenzi et al., 2017; Kumar et al., 1999; Kuwashima et al., 1997; Mokarami et al., 2017; Stiernstrom et al., 1998). In literature, this phenomenon was introduced as a possible result of overexertion (Ayoub and McDaniel, 1974; Chaffin et al., 1978; Jensen, 1988; Li et al., 2019; Smith and Gallagher, 2018; Varrecchia et al., 2018). Since the numbers of tractor control tools and also, the required forces for their activation are more than those of the typical machines, overexertion is a common expected phenomenon (Pheasant and Harris, 1982).