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Seaweed intake and blood pressure levels in healthy pre-school Japanese children

Keiko Wada1*, Kozue Nakamura1, Yuya Tamai1, Michiko Tsuji1, Yukari Sahashi1, Kaori Watanabe2, Sakiko Ohtsuchi2, Keiko Yamamoto2, Kyoko Ando2 and Chisato Nagata1

Author affiliations

1 Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu 501-1194, Japan

2 Department of Food and Culture science, Aichi Bunkyo Women's College, 2-9-17 Inaba, Inazawa, Aichi 492-8521, Japan

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Citation and License

Nutrition Journal 2011, 10:83  doi:10.1186/1475-2891-10-83

Published: 10 August 2011

Abstract

Background

Few studies have examined whether dietary factors might affect blood pressure in children. We purposed to investigate whether seaweed intake is associated with blood pressure level among Japanese preschool children.

Methods

The design of the study was cross-sectional and it was conducted in autumn 2006. Subjects were healthy preschoolers aged 3-6 years in Aichi, Japan. Blood pressure and pulse were measured once by an automated sphygmomanometer, which uses oscillometric methods. Dietary data, including seaweed intake, were assessed using 3-day dietary records covering 2 consecutive weekdays and 1 weekend day. Of a total of 533 children, 459 (86.1 percent) agreed to be enrolled in our study. Finally, blood pressure measurement, complete dietary records and parent-reported height and weight were obtained for 223 boys and 194 girls.

Results

When we examined Spearman's correlation coefficients, seaweed intake was significantly negatively related to systolic blood pressure in girls (P = 0.008). In the one-way analysis of covariance for blood pressure and pulse after adjustments for age and BMI, the boys with the lowest, middle and highest tertiles of seaweed intake had diastolic blood pressure readings of 62.8, 59.3 and 59.6 mmHg, respectively (P = 0.11, trend P = 0.038). Girls with higher seaweed intake had significantly lower systolic blood pressure readings (102.4, 99.2 and 96.9 mmHg for girls with the lowest, middle and highest tertiles of seaweed intake, respectively; P = 0.037, trend P = 0.030).

Conclusion

Our study showed that seaweed intake was negatively related to diastolic blood pressure in boys and to systolic blood pressure in girls. This suggests that seaweed might have beneficial effects on blood pressure among children.

Keywords:
blood pressure; child, preschool; diet records; seaweed; nutrition