The objective of this paper is to analyze the forearm muscular contraction levels
associated to the use of anti-vibration gloves, by comparing the contraction levels with
gloves and without gloves. Two different vibration tools were used in a simulated work
environment: (1) A compact Duty Multi-Cutter Bosch and (2) and a Percussion Drill
with a drill bit Ø20 mm. Standard operations were performed by each subject in the
following materials: (1) Performing cross-sectional cuts in 80x40 mm pine section and
(2) performing 20 mm diameter holes in a concrete slab 2 x 2 m, 70 mm thick. The
forearm contraction level were measured by surface electromyography in four different
muscles: Flexor Digitorum Superficialis (FDS), Flexor Carpi Ulnaris (FCU), Extensor
Carpi Radialis Longus (ECRL) e Extensor Carpi Ulnaris (ECU). For the flexor muscles
(FDS, FCU), an increase tendency in muscular contraction was observed when the
operations are performed without gloves (2-5% MVE increase in the FDS and 3-9%
MVE increase in the FCU). For the extensor muscles ECU a decrease tendency in
muscular contraction was observed when the operations are performed without gloves
(1-10% MVE decrease). Any tendency was found in the ECRL muscle. ECU was the
muscle with the highest contraction level for 79% and 71% of the operators, during
the operations respectively with the multi-cutter (P50= 27-30%MVE) and with the
percussion drill (P50=46-55%MVE). As a final conclusion from this study, antivibration
gloves may increase the forearm fatigue in the posterior region of the
forearm (ECU muscle) during operations with the mentioned tools.
The objective of this paper is to analyze the forearm muscular contraction levelsassociated to the use of anti-vibration gloves, by comparing the contraction levels withgloves and without gloves. Two different vibration tools were used in a simulated workenvironment: (1) A compact Duty Multi-Cutter Bosch and (2) and a Percussion Drillwith a drill bit Ø20 mm. Standard operations were performed by each subject in thefollowing materials: (1) Performing cross-sectional cuts in 80x40 mm pine section and(2) performing 20 mm diameter holes in a concrete slab 2 x 2 m, 70 mm thick. Theforearm contraction level were measured by surface electromyography in four differentmuscles: Flexor Digitorum Superficialis (FDS), Flexor Carpi Ulnaris (FCU), ExtensorCarpi Radialis Longus (ECRL) e Extensor Carpi Ulnaris (ECU). For the flexor muscles(FDS, FCU), an increase tendency in muscular contraction was observed when theoperations are performed without gloves (2-5% MVE increase in the FDS and 3-9%MVE increase in the FCU). For the extensor muscles ECU a decrease tendency inmuscular contraction was observed when the operations are performed without gloves(1-10% MVE decrease). Any tendency was found in the ECRL muscle. ECU was themuscle with the highest contraction level for 79% and 71% of the operators, duringthe operations respectively with the multi-cutter (P50= 27-30%MVE) and with thepercussion drill (P50=46-55%MVE). As a final conclusion from this study, antivibrationgloves may increase the forearm fatigue in the posterior region of the
forearm (ECU muscle) during operations with the mentioned tools.
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