Differences in back extensor strength between smokers and nonsmokers with and without low back pain

Area of Science:

• Musculoskeletal health
• Smoking-related health effects
• Epidemiology of low back pain

Background:

• Smoking is associated with general muscle weakness.
• Low back pain (LBP) is often linked to muscle weakness.
• The interplay between smoking, ILES, and LBP requires investigation.

Purpose of the Study:

• To compare isometric lumbar extensor strength (ILES) between smokers and non-smokers.
• To assess ILES in individuals with and without low back pain (LBP).
• To examine the relationship between smoking status, LBP, and ILES.

Main Methods:

• Cross-sectional study involving 76 men (30-50 years) across four groups: smokers with LBP, smokers without LBP, non-smokers with LBP, and non-smokers without LBP.
• Isometric lumbar extensor strength (ILES) measured at seven angles of lumbar flexion (0-72 degrees).
• Data analyzed using ANOVA and Scheffe post hoc tests.

Main Results:

• Non-smokers with LBP demonstrated significantly lower muscle strength than non-smokers without LBP (P<.01).
• Smokers with and without LBP showed comparable muscle strength (P>.05).
• Both non-smoking groups exhibited greater strength than the smoking groups.

Conclusions:

• Individuals who smoke have weaker isometric lumbar extensor strength (ILES) than non-smokers.
• No significant difference in ILES was observed between smokers with and without low back pain (LBP).
• Smoking is a potential cofactor in LBP etiology, but its precise role needs further research.