Page 129 - Petelin, Ana. 2020. Zdravje delovno aktivne populacije / Health of the Working-Age Population. Zbornik povzetkov z recenzijo ▪︎ Book of Abstracts. Koper: Založba Univerze na Primorskem/University of Primorska Press
P. 129
effect of various postures during office task work on shoulder
girdle muscle activity
Tadej Vogrič, Matej Voglar
University of Primorska, Faculty of Health Sciences, Polje 42, 6310 Izola, Slovenia
Introduction: Maintaining a static posture in a sitting posture, while perform- ohranjanje in krepitev zdravja | maintaining and promoting health
ing office tasks, requires long-term low static muscle loading, which increas-
es the risk of musculoskeletal problems. The aim of this study was to evaluate
the impact of different working postures, during office task work, on shoul-
der girdle and thoracic extensor muscle activation levels. Methods: Subjects
with predominantly sedentary work, capable of ten finger »blind typing« while
maintain gaze fixed in computer screen, were invited to participate in our re-
search. Presence of acute or chronic pain in the neck or shoulder area was set
as an exclusion criterion. 14 people (6 men and 8 women) responded to the in-
vitation. Each participant completed measurements within the same day. Two
standardized tasks simulating office work (typing and working with mouse),
each in duration of 7 minutes, were performed in sitting, standing and during
cycling on cyclo-ergometer (50 W). Posture order was counterbalanced using
Latin square method. There was 2 minute pause in-between each measure-
ment. Muscle activation was measured bi-laterally and expressed as static (10.
percentile) and median (50. percentile) for all three trapezius bundles, erector
spinae and deltoideus anterior muscles. Speed and accuracy of typing was as-
sessed in all three postures.
Results: The static lower trapezius bundle activity was statistically significantly
a=etiffvff5eiet.ccy4tt8oeo7df f,tbpphyoe=stathn0uet.r0eep3roai9osn,trdƞudprt2eaels=t(koF0i(2dF..322m32.23u=)2scf=u6ler.45twh.04ea97sr,7mps, tpo=art=ie0s,.t00itc.0h0ae16ll2r,ye,ƞsƞpwig2pn2a=i=sfi0sc0i.ag3.n3n6t3i8lfyi2)c)aaa. fnnTfetdhcienttaetsesdtkrabat(icyFct1tia.oh1c1ne-
factor task (F1.13 = 8.767, p6a.c9=t7iv07i;.t0yp11s=,hƞo0wp.02 e0=d4;0aƞ.4sp0t2a3=t)is0at.ni3cd4al9tlyh).esAiginnntaiefliyrcsaaicsnttoioifnnttheeerffamecctetidooin-f
posture and task (F2.26 = (F1.18 y=w3a.s83st1a,tpist=ica0ll.y04s1ig,nƞifpic2 a=nt0ly.2a9ff9e)c. tTehdebmy teadsik-
an upper trapezius bundle activit
effect of posture and task
an anterior deltoid muscle
ft(eiFo1cn.t1o3off=pgao2p1s.is1ti7wo5na,spanm=do0ts.at0sp0kr0o(,Fmƞ2p.in22e=6n=0t .i61n22d0.7e)4lat6on,didpteh=uesr0ae.0nwt0ea0rs,iosƞirgp2nm=ifuic0sac.4nle9t,5inw).theTirlheaectthdioeentgeeacfp--
occurrence in other muscles was scarce.
Discussion and conclusion: The static and median lower trapezius bundle activ-
ity was lower in the standing posture compared to the sitting posture. During
cycling, the median anterior deltoid muscle activity increased compared to the
sitting posture, but only when performing mouse work. Productivity between
positions was unchanged. In terms of muscle load, the results are in line with
previous studies, although in contrary some of previous studies reported de-
cline in productivity. Further research is needed.
Key words: active workstation, muscle activation, trapezius muscle loading.
127
girdle muscle activity
Tadej Vogrič, Matej Voglar
University of Primorska, Faculty of Health Sciences, Polje 42, 6310 Izola, Slovenia
Introduction: Maintaining a static posture in a sitting posture, while perform- ohranjanje in krepitev zdravja | maintaining and promoting health
ing office tasks, requires long-term low static muscle loading, which increas-
es the risk of musculoskeletal problems. The aim of this study was to evaluate
the impact of different working postures, during office task work, on shoul-
der girdle and thoracic extensor muscle activation levels. Methods: Subjects
with predominantly sedentary work, capable of ten finger »blind typing« while
maintain gaze fixed in computer screen, were invited to participate in our re-
search. Presence of acute or chronic pain in the neck or shoulder area was set
as an exclusion criterion. 14 people (6 men and 8 women) responded to the in-
vitation. Each participant completed measurements within the same day. Two
standardized tasks simulating office work (typing and working with mouse),
each in duration of 7 minutes, were performed in sitting, standing and during
cycling on cyclo-ergometer (50 W). Posture order was counterbalanced using
Latin square method. There was 2 minute pause in-between each measure-
ment. Muscle activation was measured bi-laterally and expressed as static (10.
percentile) and median (50. percentile) for all three trapezius bundles, erector
spinae and deltoideus anterior muscles. Speed and accuracy of typing was as-
sessed in all three postures.
Results: The static lower trapezius bundle activity was statistically significantly
a=etiffvff5eiet.ccy4tt8oeo7df f,tbpphyoe=stathn0uet.r0eep3roai9osn,trdƞudprt2eaels=t(koF0i(2dF..322m32.23u=)2scf=u6ler.45twh.04ea97sr,7mps, tpo=art=ie0s,.t00itc.0h0ae16ll2r,ye,ƞsƞpwig2pn2a=i=sfi0sc0i.ag3.n3n6t3i8lfyi2)c)aaa. fnnTfetdhcienttaetsesdtkrabat(icyFct1tia.oh1c1ne-
factor task (F1.13 = 8.767, p6a.c9=t7iv07i;.t0yp11s=,hƞo0wp.02 e0=d4;0aƞ.4sp0t2a3=t)is0at.ni3cd4al9tlyh).esAiginnntaiefliyrcsaaicsnttoioifnnttheeerffamecctetidooin-f
posture and task (F2.26 = (F1.18 y=w3a.s83st1a,tpist=ica0ll.y04s1ig,nƞifpic2 a=nt0ly.2a9ff9e)c. tTehdebmy teadsik-
an upper trapezius bundle activit
effect of posture and task
an anterior deltoid muscle
ft(eiFo1cn.t1o3off=pgao2p1s.is1ti7wo5na,spanm=do0ts.at0sp0kr0o(,Fmƞ2p.in22e=6n=0t .i61n22d0.7e)4lat6on,didpteh=uesr0ae.0nwt0ea0rs,iosƞirgp2nm=ifuic0sac.4nle9t,5inw).theTirlheaectthdioeentgeeacfp--
occurrence in other muscles was scarce.
Discussion and conclusion: The static and median lower trapezius bundle activ-
ity was lower in the standing posture compared to the sitting posture. During
cycling, the median anterior deltoid muscle activity increased compared to the
sitting posture, but only when performing mouse work. Productivity between
positions was unchanged. In terms of muscle load, the results are in line with
previous studies, although in contrary some of previous studies reported de-
cline in productivity. Further research is needed.
Key words: active workstation, muscle activation, trapezius muscle loading.
127
