Lifetime shift work exposure : association with anthropometry, body composition, blood pressure, glucose and heart rate variability.
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2015
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Objective To evaluate the association between lifetime
exposure to shift work and blood pressure, fasting
glucose (FG), anthropometric variables, body
composition and heart rate variability (HRV).
Methods Male shift workers (N=438) were evaluated
using principal component (PC) analysis. The variables
used were: weight, body mass index (BMI), waist
circumference (WC), neck circumference (NC), hip
circumference (HC), waist-to-hip ratio (WHR), waist-toheight
ratio (WHtR), body fat mass (BFKg), body fat
percentage (BF%), visceral fat area (VFA), FG, systolic
(SBP) and diastolic blood pressure (DBP), and HRV
variables. ECG was performed, extracting heart rate (HR),
root mean square of the successive differences (RMSSD),
high frequency (HF), low frequency (LF) and the LF/HF
ratio. Using linear regression models, the lifetime shift
work exposure was associated with each PC.
Results Five PCs were obtained, which accounted for
79.6% of the total variation of the data. PC1 (weight,
BMI, WC, NC, HC, WHR, WHtR, BFKg, BF% and VFA)
was designated as body obesity; PC2 (HF, RMSSD and LF)
as good cardiac regulation; PC3 (SBP and DBP) as blood
pressure; PC4 (LF/HF ratio and HR) as bad cardiac
regulation and PC5 (WHR and FG) as insulin resistance.
After age adjustment, the regression analysis showed that
lifetime shift work was negatively associated with PC2
and positively associated with PC3.
Conclusions The association of lifetime shift work
exposure with PC2 and PC3 suggests that shift work
promotes unfavourable changes in autonomic cardiac
control related to a decrease in parasympathetic
modulation and an increase in blood pressure.
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SOUZA, B. B. et al. Lifetime shift work exposure: association with anthropometry, body composition, blood pressure, glucose and heart rate variability. Occupational and Environmental Medicine, v. 72, p. 208-215, 2015. Disponível em: <https://oem.bmj.com/content/72/3/208>. Acesso em: 29 ago. 2017.