Effect of different doses of aerobic exercise training on total bilirubin levels

Abstract

Low serum bilirubin levels have been associated with increased risk for cardiovascular disease, and recent data suggest that lower body fat and reductions in weight are associated with higher bilirubin levels. However, it is unknown if exercise training can increase bilirubin levels and whether a higher dose of exercise will further increase bilirubin levels compared with a lower dose.

Purpose: The primary aim of our current report was to examine whether exercise dose affects bilirubin levels in obese postmenopausal women from the Dose-Response to Exercise in Women trial. In addition, we evaluated whether changes in fitness, insulin sensitivity, and waist circumference associated with exercise training were associated with change in bilirubin levels.

Methods: Participants (n = 419) were randomized to the control group or to 4, 8, and 12 kcal·kg⁻¹·wk⁻¹ (KKW) of exercise training at an intensity of 50% of aerobic capacity. Total bilirubin levels were evaluated at baseline and at follow-up.

Results: Exercise training significantly increased serum bilirubin levels only in the 12-KKW group (0.044 mg·dL⁻¹, P = 0.026) compared with the control group (0.004 mg·dL⁻¹). Subgroup analyses showed that there was a significant increase in bilirubin levels in participants in the 12-KKW group (0.076 mg·dL⁻¹) who were classified as insulin resistant (homeostatic model assessment for insulin resistance score > 2.6) compared with insulin-resistant control participants (0.018 mg·dL⁻¹, P = 0.028).

Conclusions: Our findings suggest that high doses of exercise training are necessary to significantly increase bilirubin levels in previously sedentary postmenopausal women and especially those with impaired glucose metabolism.

Figure 1

The effect of different doses of aerobic exercise training on total serum bilirubin levels. Shown are the effect of exercise training on total serum bilirubin levels in 419 participants from the DREW trail. Analysis was adjusted for baseline value, ethnicity and age. Results are presented as adjusted least-square means with 95% confidence intervals.

Figure 2

The effect of different doses of exercise on total serum bilirubin levels in insulin sensitive versus insulin resistant participants. Shown are the effect of exercise training on serum bilirubin levels in participants classified as insulin resistant (HOMA score >2.6) (n=176) and insulin sensitive at baseline (HOMA score < 2.6) (n= 276). Analysis was adjusted for baseline value, ethnicity and age. Results are presented as adjusted least-square means with 95% confidence intervals.