TY - JOUR
T1 - Efficient one-day sampling of mechanical job exposure data—a study based on upper trapezius activity in cleaners and office workers
AU - Mathiassen, Svend Erik
AU - Burdorf, Alex
AU - Van Der Beek, Allard J.
AU - Hansson, Gert Åke
N1 - Funding Information: Parts of the present study were supported by a joint grant from the Swedish Medical Research Council and the Council for Medical and Health Research of the Netherlands Organization for Scientific Research (grant K99-99NL-12990- 01A). Other parts were supported by the Swedish Council for Work Life Research, the Swedish Councils for Planning and Coordination of Research, the Medical Faculty of Lund University, and the County Councils of Southern Sweden.
PY - 2003/3/1
Y1 - 2003/3/1
N2 - This ergonomics exposure assessment study compared the efficiency of eight 1-day-only strategies, that is, the relationship between the number of data collected per subject and the precision of the resulting mean exposure estimate. Whole-day electromyographic recordings from the right upper trapezius muscle in 24 cleaners and 23 office workers were processed to give minute-by-minute values of gap time and jerk time—parameters representing the level and frequency dimensions of muscle activation, respectively. On-site observations provided data on time spent in each of eight exhaustive task categories in the job, seven of which were associated with activities during work, and the last comprising breaks. On average, sampling at fixed intervals without regard to tasks doubled efficiency as compared with random sampling, which in turn was several times as efficient as consecutive sampling. Stratified sampling according to the two broad categories, work and breaks, increased efficiency for random and fixed-interval sampling, but the gain was distinct only among cleaners (about 20%). The commonly used strategy in ergonomic studies of sampling consecutively for short periods within tasks was highly inefficient. Further classification of work into the seven subcategories resulted in marginal additional increases in efficiency; on average less than 2%. A decision algorithm is given for determining appropriate sampling strategies in different types of jobs.
AB - This ergonomics exposure assessment study compared the efficiency of eight 1-day-only strategies, that is, the relationship between the number of data collected per subject and the precision of the resulting mean exposure estimate. Whole-day electromyographic recordings from the right upper trapezius muscle in 24 cleaners and 23 office workers were processed to give minute-by-minute values of gap time and jerk time—parameters representing the level and frequency dimensions of muscle activation, respectively. On-site observations provided data on time spent in each of eight exhaustive task categories in the job, seven of which were associated with activities during work, and the last comprising breaks. On average, sampling at fixed intervals without regard to tasks doubled efficiency as compared with random sampling, which in turn was several times as efficient as consecutive sampling. Stratified sampling according to the two broad categories, work and breaks, increased efficiency for random and fixed-interval sampling, but the gain was distinct only among cleaners (about 20%). The commonly used strategy in ergonomic studies of sampling consecutively for short periods within tasks was highly inefficient. Further classification of work into the seven subcategories resulted in marginal additional increases in efficiency; on average less than 2%. A decision algorithm is given for determining appropriate sampling strategies in different types of jobs.
KW - Data collection
KW - Efficiency
KW - Ergonomics
KW - Mechanical exposure
KW - Precision
KW - Task analysis
UR - http://www.scopus.com/inward/record.url?scp=0038082355&partnerID=8YFLogxK
U2 - https://doi.org/10.1080/15428110308984809
DO - https://doi.org/10.1080/15428110308984809
M3 - Article
C2 - 12688844
SN - 1542-8117
VL - 64
SP - 196
EP - 211
JO - American Industrial Hygiene Association Journal
JF - American Industrial Hygiene Association Journal
IS - 2
ER -