The study investigated the relations between physical exercise and musculos
keletal pain among forest industry workers. We studied a population of 3312
Finnish forest industry workers, who replied to a questionnaire survey in
1994 (response rate 77%). The outcome variables in this cross-sectional stu
dy were the number of days with pain in the low back, neck, shoulder and kn
ee during the preceding 12 months. Multivariable logistic regression models
were used in statistical analyses. Active walkers had more sciatic pain, a
ctive volleyball players had more shoulder pain and those who practiced tre
kking actively had more knee pain than those who practiced these activities
less. The risk of shoulder pain was more than three times higher for those
who played volleyball actively compared to those who played less. In addit
ion, age, mental stress and work-related physical loading were strongly ass
ociated with musculoskeletal pain, When studying the relations between phys
ical exercise and musculoskeletal pain in a working population, it is impor
tant to not only detect the general physical activity but also to specify t
he different modes of exercise. In addition, the other factors which are st
rongly related to pain (such as mental stress and work-related physical loa
ding) should be taken into account.