This study found significant bilateral reductions in diaphragm thickness during inspiration and in the difference between inspiration and expiration in the right hemidiaphragm in athletes with nonspecific lumbopelvic pain (LPP) lasting for over 6 weeks.

No other parameters showed significant differences, including those related to the left hemidiaphragm and breathing patterns. The presence of LPP was a significant predictor of right and left hemidiaphragm thickness during inspiration.