2019, Number 2
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Rev Invest Clin 2019; 71 (2)
Fasting Insulin and Alanine Amino Transferase, but not FGF21, Were Independent Parameters Related with Irisin Increment after Intensive Aerobic Exercising
de la Torre-Saldaña VA, Gómez-Sámano MÁ, Gómez-Pérez FJ, Rosas-Saucedo J, León-Suárez A, Grajales-Gómez M, Oseguera-Moguel J, Vega- Beyhart A, Cuevas-Ramos D
Language: English
References: 36
Page: 133-140
PDF size: 213.74 Kb.
ABSTRACT
Background: Irisin is a protein cleaved from fibronectin type III domain-containing protein 5 and has been implicated in the
beneficial effects of exercise. However, it is unknown which factors contribute to irisin increment after intensive exercising in
humans. This study aimed to assess independent factors related with serum irisin after 2 weeks of supervised physical activity
in young sedentary healthy women.
Design and Methods: We developed a comparative, interventional, longitudinal, and
prospective study at a third-level specialty health center. Between March 2010 and August 2011, 82 sedentary young adult
women, without chronic diseases or regular medical treatments, were recruited. A total of 38 women fulfilled selection criteria,
and irisin concentrations were quantified before and after the intervention. Independent factors related with irisin increment
were evaluated according to mild to moderate and vigorous intensity of physical activity. A supervised treadmill exercise test
following the Bruce’s protocol was conducted from Monday to Friday during 2 weeks. In addition, anthropometric measurements
were taken, and fibroblast growth factor 21 (FGF21), glucose, insulin, and liver transaminases were measured.
Results:
Intensity of exercising was directly related to irisin (
p = 0.02) and FGF21 (
p = 0.01) serum levels. However, an independent
and significant relationship between FGF21 and irisin was not confirmed. A novel association was found between alanine aminotransferase
(ALT) and irisin, showing a positive and significant correlation (
r = 0.37,
p = 0.02). The association was particularly
strong with higher intensity of aerobic exercising (
r = 0.64,
p = 0.01). Linear regression model adjusted for glucose
and body mass index confirmed an independent association between ALT and irisin and also between insulin and irisin (adjusted
R
² = 0.12,
p = 0.04). Such association increased after grouping in moderate to vigorous physical activity intensity
(adjusted R
² = 0.46,
F = 4.7,
p = 0.03).
Conclusions: Serum irisin and FGF21 levels significantly increased after 2 weeks of
supervised physical activity. However, only fasting insulin and ALT, but not FGF21, were independent parameters explaining
irisin increment, mainly after moderate to vigorous exercising.
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