Physical exertion and working efficiency of reforestation workers

• Main Authors: Kennedy Michael D, Hodges Alastair NH
• Format: Article
• Language: English
• Published: BMC 2011-06-01
• Series: Journal of Occupational Medicine and Toxicology
• Online Access: http://www.occup-med.com/content/6/1/20

<p>Abstract</p> <p>Background</p> <p>The purpose of this study was to quantify the physical exertion during tree planting work and to examine the relationships between exertion, task efficiency, and productivity.</p> <p>Methods</p> <p>Heart rate (HR) was monitored on 34 tree planters while they worked. HR data was collected for a complete working day on 19 subjects and for shorter periods of time on 15 subjects. Video of work tasks was recorded on 22 subjects (video was recorded on 7 of the subjects for whom HR was monitored through a full working day) and analyzed for working pace and proportion of time spent on each task.</p> <p>Results</p> <p>HR during a full day (9.0 ± 1.2 hours) of tree planting work was 115.2 ± 8.8 beats.min^-1, and working HR was 128.2 ± 15.6 beats.min^-1for 82.5 ± 6.8% of the work day. Mean work pace was 452 ± 174 trees.h^-1, and the proportion of time spent planting each tree was 53 ± 8% of the working time. Significant (P < 0.05) positive correlations were found between work pace and experience level, and between work pace and working HR, and a significant (P < 0.05) negative correlation was found between experience level and HR for a given work pace. No significant relationships were found between experience level or work pace and the proportion of time spent planting each tree.</p> <p>Conclusions</p> <p>Tree planters work at approximately 65% of age-predicted HR_max, and maintain HR at approximately 59% of HR_maxthroughout the entire working day. Productivity in these workers appears to be related to effort rather than to experience or task efficiency <it>per se</it>.</p>