Effect of hand-arm vibration of a chain-saw on immediate standing balance ability

Abstract

[Purpose] The purpose of this study was to clarify the effect of holding a chain-saw on static and dynamic standing balance abilities. [Subjects] The subjects were 12 healthy adult men. [Methods] The standing balance abilities (center of foot pressure locus length, envelope area, and anterior displacement) of all the subjects were measured on a stabilometer at rest, and immediately, 5, and 10 minutes after holding a chain-saw. The chain-saw was held under two conditions: with and without the chain-saw motor running. [Result] The unit locus length and envelope area showed no significant differences between before and after holding a chain-saw. The anterior displacement measured at immediately and 5 minutes after holding a chain-saw with the motor running were found to be significantly decreased, compared to the rest condition. [Conclusion] The results of this study suggest that operating a chain-saw possibly decreases standing balance ability.