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Study Design.

This was a cross-sectional study.

Objective.

The primary aim of the study was to examine the association between low back pain (LBP) and muscle-strengthening activity (MSA) among US adults using gender-stratified analyses.

Summary of Background Data.

LBP is a common medical condition that impacts quality of life and professional productivity and increases the financial burden on the health care system by augmenting medical treatment costs. Previous studies analyzing gender-dependent relationships between MSA and LBP have produced mixed results.

Methods.

Our sample included 12,721 participants from the 1999 to 2004 National Health and Nutrition Examination Survey (NHANES). Participants were categorized into one of three levels of self-reported MSA: no MSA, insufficient MSA (1 day/wk), or meeting the 2008 Department of Health and Human Services (DHHS) recommendation for …