A pilot study of glove effects on a force matching method.
McDowell-TW; Dong-RG; Welcome-DE
10th International Conference on Hand-Arm-Vibration, June 2004, Las Vegas, Nevada. 2004 Jun; :83-84
Operating powered hand tools such as chipping hammers and rock drills frequently requires forceful and repeated push and grip actions to control the tools and achieve desired productivity. Many of these tools are also known to generate high magnitudes of hand-transmitted vibration. A tight hand-tool coupling imposes high stresses on the anatomical structure of the hand-arm system and impedes peripheral circulation; it also increases hand-arm vibration (HAV) transmissibility (Brammer, 1982; Hartung et al., 1993; Riedel, 1995). Although the importance of hand coupling force has been recognized, the current international HAV assessment standard (ISO-5349-1, 2001a) has not accounted for this factor. This is partially due to the lack of a practical method for quantifying the hand coupling force. Several approaches have been proposed to modify the assessment methodology to included the hand force effect (Riedel, 1995; Kaulbars, 1996). An international committee has drafted a working document in an effort to develop a generally acceptable method for quantifying hand coupling forces (ISO/WD 15230, 200 lb). While it is technically feasible to accurately measure hand forces using instrumented handles or flexible force sensors (see Welcome et al., 2001), quantifying hand forces applied to tools in the workplace remains a formidable task. As a convenient approach, a psychophysical technique called magnitude-reproduction or the force matching method has been used to quantify various hand and arm forces (e.g., Stevens 1960; Gescheider, 1997). However, the use of this technique for measuring hand forces applied to vibrating tools has not been seriously studied. To examine and refine this technique, NIOSH researchers have planned a series of systematic studies. As part of this process, this study focused on glove use as an influencing factor on force matching accuracy.
Gloves; Tools; Hand-tools; Vibration-exposure; Vibration-effects; Hand-injuries; Hand-protection; Arm-injuries
10th International Conference on Hand-Arm-Vibration, June 2004, Las Vegas, Nevada