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An investigation of hand forces and postures for using selected mechanical pipettes
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1
An
investigation
of
hand
forces
and
postures
for
using
selected
mechanical
pipettes
.
Authors
Lu ML; James T; Lowe B; Barrero M; Kong YK
Source
Int J Ind Ergon 2008 Jan; 38(1):18-29
Link
https://doi.org/10.1016/j.ergon.2007.08.006
NIOSHTIC No.
20033404
Abstract
The present study evaluated thumb,
hand
forces
, wrist, forearm
and
shoulder
postures
used
for
pipetting with three
selected
mechanical
pipettes
. Twelve pipette users in a large university health system participated in pipetting simulation in their own laboratories to investigate the effects
of
pipette type, body posture (standing/seated), sample volume (200/1000 µL)
and
pipetting task on the physical risk factors. The thumb
and
hand
forces
were measured with 19 Flexiforce(copyright) sensors. Wrist
and
forearm
postures
were measured with an electrogoniometer
and
a torsiometer, respectively. Humeral elevation as shoulder postural stress was assessed by observations from videos recorded during pipetting simulation. The study results showed several advantages
of
using
the non-axial pipette over the traditional axial ones. The non-axial pipette was associated with approximately 2-6 times less thumb
and
hand
force than the traditional axial
pipettes
. In addition, there were approximately 20-30% reductions in ulnar deviation
and
30-70% reductions in humeral elevation to operate the non-axial pipette
for
most
of
the pipetting actions. One disadvantage
of
using
the non-axial pipette appears to be increased forearm pronation by approximately 100-150%
for
the entire pipetting cycle, as compared to the axial
pipettes
. The results
of
the study may provide useful information regarding design
of
pipettes
for
reducing physical risk factors associated with pipetting. Relevance to industry: This paper demonstrated
hand
forces
and
postures
for
common pipetting tasks with
selected
mechanical
pipettes
. The
hand
force and postural data for
using
axial
and
non-axial
pipettes
may provide key information for
hand
injury prevention due to pipetting in the industry.
Keywords
Mathematical-models; Laboratory-equipment; Laboratory-work; Laboratory-workers; Posture;
Hand
-injuries; Biomechanics; Biomedical-engineering; Physical-stress; Musculoskeletal-system; Musculoskeletal-system-disorders
Contact
Ming-Lun Lu, National Institute
for
Occupational Safety
and
Health, DART, Taft Laboratories, 4676 Columbia Parkway, MS C-24, Cincinnati, OH 452
Publication Date
20080101
Document Type
Journal Article
Email Address
mlu@cdc.gov
Fiscal Year
2008
NTIS Accession No.
NTIS Price
Issue of Publication
1
ISSN
0169-8141
NIOSH Division
DART
Source Name
International Journal
of
Industrial Ergonomics
State
OH; NC
Page 1 of 1
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Page last reviewed:
December 9, 2020
Content source:
National Institute for Occupational Safety and Health
Education and Information Division
