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J Hepatol. 2015 Jul;63(1):174-82. doi: 10.1016/j.jhep.2015.02.022. Epub 2015 Apr 8.

Effect of aerobic exercise training dose on liver fat and visceral adiposity.

Author information

1
Discipline of Exercise and Sport Science, University of Sydney, NSW, Australia.
2
Boden Institute of Obesity, Nutrition, Exercise & Eating Disorders, Sydney Medical School, University of Sydney, NSW, Australia.
3
School of Exercise Science, Australian Catholic University, NSW, Australia.
4
School of Health Sciences, University of Newcastle, Newcastle, Australia.
5
Storr Liver Centre, Westmead Millennium Institute and Westmead Hospital, University of Sydney, NSW, Australia. Electronic address: jacob.george@sydney.edu.au.
6
Discipline of Exercise and Sport Science, University of Sydney, NSW, Australia; Boden Institute of Obesity, Nutrition, Exercise & Eating Disorders, Sydney Medical School, University of Sydney, NSW, Australia.

Abstract

BACKGROUND & AIMS:

Aerobic exercise reduces liver fat and visceral adipose tissue (VAT). However, there is limited data from randomized trials to inform exercise programming recommendations. This study examined the efficacy of commonly prescribed exercise doses for reducing liver fat and VAT using a randomized placebo-controlled design.

METHODS:

Inactive and overweight/obese adults received 8 weeks of either; i) low to moderate intensity, high volume aerobic exercise (LO:HI, 50% VO 2peak, 60 min, 4d/week); ii) high intensity, low volume aerobic exercise (HI:LO, 70% VO 2peak, 45 min, 3d/week); iii) low to moderate intensity, low volume aerobic exercise (LO:LO, 50% VO 2peak, 45 min, 3d/week); or iv) placebo (PLA). Liver fat (spectroscopy) and VAT (magnetic resonance imaging) were measured before and after intervention.

RESULTS:

Forty-seven of the 48 (n = 12 in each group) participants completed the trial. There were no serious adverse events. There was a significant change in group × time interaction in liver fat, which reduced in HI:LO by 2.38 ± 0.73%, in LO:HI by 2.62 ± 1.00%, and in LO:LO by 0.84 ± 0.47% but not in PLA (increase of 1.10 ± 0.62%) (p = 0.04). There was a significant reduction in VAT in HI:LO (-258.38 ± 87.78 cm(3)), in LO:HI (-386.80 ± 119.5 cm(3)), and in LO:LO (-212.96 ± 105.54 cm(3)), but not in PLA (92.64 ± 83.46 cm(3)) (p = 0.03). There were no significant differences between the dose or intensity of the exercise regimen and reductions in liver fat or VAT (p > 0.05).

CONCLUSION:

The study found no difference in efficacy of liver fat reduction by either aerobic exercise dose or intensity. All of the aerobic exercise regimens employed reduced liver fat and VAT by a small amount without clinically significant weight loss.

KEYWORDS:

Abdominal fat; NAFLD; Obesity; Physical activity; Weight loss

PMID:
25863524
DOI:
10.1016/j.jhep.2015.02.022
[Indexed for MEDLINE]

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