Fletta eftir höfundi "Sveinbjörnsson, Jóhannes"

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Caffeine exposure from beverages and its association with self-reported sleep duration and quality in a large sample of Icelandic adolescents

Halldórsson, Þórhallur Ingi; Kristjánsson, Álfgeir Logi; Þórisdóttir, Ingibjörg E.; Oddsdóttir, Charlotta; Sveinbjörnsson, Jóhannes; Benediktsson, Rafn; Sigfúsdóttir, Inga Dóra; Jörundsdóttir, Hrönn Ólína; Gunnlaugsdóttir, Helga; Halldorsson, T I (2021-11)

Previous risk assessments have concluded that adolescent's caffeine exposure from energy drinks (ED) are of limited concern. Recent surveys have, however, shown substantial increase in consumption. This cross-sectional survey conducted in 2020 estimated ...
Effect of a high-palmitic acid fat supplement on milk production in Icelandic dairy cows fed grass silage-based diet

Sveinbjörnsson, Jóhannes; Baldursdóttir, Hrafnhildur (Agricultural University of Iceland, 2020)

Thirty-seven dairy cows of the Icelandic breed were used in a change-over design experiment. The aim was to analyse the effects of moderate addition of high-palmitic acid (C16:0) fat supplement to a grass silage-based diet. There were three experimental ...

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