Table 1.

Baseline characteristics of study participants by gender and intervention group

Women
Men
P*
Exercisers (N = 42), mean (range %)Controls (N = 47), mean (range %)Exercisers (N = 47), mean (range %)Controls (N = 48), mean (range %)
Age (y)54.4 (43-68)53.8 (42-65)56.3 (40-70)56.7 (40-74)0.02
Race
    White36 (86)43 (91)44 (94)45 (94)
    Non-White6 (14)4 (8)3 (6)3 (6)0.24
Education: college degree or more22 (52)30 (64)30 (63)26 (55)<0.0001
Any NSAID use14 (33)18 (38)22 (47)16 (33)0.57
Family history of colorectal cancer17 (40)17 (36)14 (30)18 (38)<0.0001
Previous polyps (adenomatous)18 (43)19 (40)34 (72)35 (73)<0.0001
BMI (kg/m2)28.5 (21.4-42.9)28.9 (21.1-39.9)29.7 (23.3-41.7)29.8 (21.3-44.9)0.12
Body fat (%)42.8 (27.4-61.7)43.5 (28.7-57.4)31.2 (12.4-43.7)29.4 (14.5-38.4)0.29
Steps/d6,147 (1,573-12,644)6,541 (1,717-14,652)6,092 (2,192-12,955)6,286 (1,610-15,737)0.65
VO2 max (mL/kg/min)24.0 (14.9-37.1)24.9 (17.5-36.9)30.3 (21.6-44.8)30.7 (15.0-49.3)<0.0001
Alcohol (g/d)6.0 (0-24.7)6.3 (0-45.5)11.7 (0-60.1)14.0 (0-68.7)0.001
Current smoker2 (5)1 (2)4 (8.5)5 (10.4)0.09
PGE2 (pg/mg protein)1,020 (94-4,987)1,295 (115-7,044)699 (36.3-4,330)1,143 (61-7,803)0.21
PGF (pg/mg protein)849 (173-2,580)960 (199-5,514)706 (93.5-2,719)876 (172-5,134)0.30
  • Abbreviations: BMI, body mass index; PGE2, prostaglandin E2; PGF, prostaglandin F; VO2 max, maximal oxygen consumption.

  • * P value comparing males and females at baseline.