orkers who often use their hands in a forceful gripping and pinching motion face a higher risk of developing carpal tunnel syndrome, a painful condition that causes tingling, numbness and weakness in the hand and sometimes requires surgery, according to recent research.
Low-force repetitive hand motion and wrist posture, widely thought of as key risk factors, appear in recent findings to be of lower importance than forceful pinch and grip among workers doing hand-intensive tasks, such as food processing and manufacturing work.
“Recent results from our study and others suggest that the frequency and duration of forceful grip and pinch are the major work-related predictors of carpal tunnel syndrome,” said Washington University’s Bradley Evanoff, speaking as the opening keynote at the Prevention of Work-Related Musculoskeletal Disorders (PREMUS) conference in Toronto. “Low-force repetitive movements such as computer use do not seem to be a major risk factor.”
While the results of Evanoff’s study do not directly address the risk factors for carpal tunnel syndrome in office and computer work, workers in these jobs have much lower rates of this condition than those in more physically demanding occupations.
Evanoff shared the findings of a large-scale research project involving more than 4,300 workers at more than 50 workplaces, a project conducted by six major research centres in the United States and led by the National Institute for Occupational Safety and Health (NIOSH). The data pooled from the six centres has made it possible to explore the role of work-related and personal risk factors for carpal tunnel syndrome, as well as to measure the level of exposure that would result in the condition.
Findings from this pooled data also reveal the psychosocial factors at play. For example, high job demand and low job control increase the risk of carpal tunnel syndrome among those already using forceful motion at work. Having greater say on how to do one’s work decreases the risk, but only for those working with low levels of hand force. The data also shows the risk of carpal tunnel syndrome, which is 30 per cent higher among women, also increases with age and body mass index.
“There has been the long-standing question of the relative importance of work factors as compared to the personal factors in the development of carpal tunnel syndrome,” said Evanoff. “It has been demonstrated in this study that work factors are strong independent risk factors, even after controlling for obesity, diabetes, age and gender.”
The study also found workers in their first three years of work face a significantly higher risk for carpel tunnel syndrome for the same exposures than their colleagues with longer job tenures.
This article originally appeared in the August/September 2016 issue of COS.
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