Lifetime shift work exposure: association with anthropometry, body composition, blood pressure, glucose and heart rate variability

Dec 26, 2014Occupational and environmental medicine

Lifetime shift work exposure linked to body measurements, blood pressure, blood sugar, and heart rate variability

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Abstract

Lifetime shift work exposure is negatively associated with good cardiac regulation and positively associated with blood pressure.

Five principal components accounted for 79.6% of the total variation in various health indicators.
Body obesity was identified as a principal component associated with weight, body mass index, and body fat metrics.
Good cardiac regulation was linked to heart rate variability measures.
Blood pressure was identified as a separate principal component related to systolic and diastolic pressure.
Shift work exposure may lead to decreased parasympathetic modulation of the heart and increased blood pressure.

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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-to-height 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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Lifetime shift work exposure: association with anthropometry, body composition, blood pressure, glucose and heart rate variability

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