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Paderborn University in February 2023 Show image information

Paderborn University in February 2023

Photo: Paderborn University, Hannah Brauckhoff

Bianca Stutz

 Bianca Stutz

Public Health Nutrition

Research Associate - Public Health Nutrition

+49 5251 60-5236
Warburger Str. 100
33098 Paderborn

Open list in Research Information System


The association of chronotype and social jet lag with body composition in German students: The role of physical activity behaviour and the impact of the pandemic lockdown

B. Krueger, B. Stutz, N. Jankovic, U. Alexy, A. Kilanowski, L. Libuda, A.E. Buyken, PLOS ONE (2023), 18(1), e0279620

<jats:p>Young adults with a later chronotype are vulnerable for a discrepancy in sleep rhythm between work- and free days, called social jet lag (SJL). This study analysed (i) chronotype/SJL association with visceral fat/skeletal muscle mass, (ii) the attribution to physical activity behaviour, and (iii) chronotype-specific changes in physical activity behaviour in young adults during the Covid-19 pandemic lockdown. Chronotype and SJL were derived from the Munich-Chrono-Type-Questionnaire in 320 German students (age 18–25 years) from September 2019 to January 2020, 156 of these participated in an online follow-up survey in June 2020. Body composition was assessed by bioimpedance analysis at baseline. Multivariable linear regression analyses were used to relate chronotype/SJL to body composition; the contribution of self-reported physical activity was tested by mediation analysis. At baseline, a later chronotype and a larger SJL were associated with a higher visceral fat mass (P&lt;0.05), this relation was notably mediated by the attention to physical activity (P&lt;0.05). Chronotype (P = 0.02) but not SJL (P = 0.87) was inversely associated with skeletal muscle mass. During the pandemic lockdown, chronotype hardly changed, but SJL was reduced. Timing and physical activity behaviour remained in most participants and changes were unrelated to chronotype (all P&gt;0.07). A later chronotype/higher SJL may increase the risk of a higher visceral fat mass even in this relatively healthy sample, which may be partly due to their physical activity behaviour. Despite a reduction in SJL during the pandemic lockdown, later chronotypes did not change their physical activity behaviour more than earlier chronotypes.</jats:p>


Associations of chronotype and social jetlag with eating jetlag and their changes among German students during the first COVID-19 lockdown. The Chronotype and Nutrition study

B. Stutz, A. Buyken, A. Schadow, N. Jankovic, U. Alexy, B. Krueger, Appetite (2022), 180, 106333


Relative validity of a glycemic index extended food-frequency questionnaire.

J. Goletzke, K. Weber, T. Kössler, O. Zaharia, K. Bódis, K. Müssig, J. Szendroedi, V. Burkart, B. Stutz, U. Nöthlings, A. Buyken, M. Roden, G. Group, Nutr Metab Cardiovasc Dis (2022), 32(10), pp. 2310-2320


Association between habitual coffee consumption and metabolic syndrome in type 1 diabetes

B. Stutz, A. Ahola, V. Harjutsalo, C. Forsblom, P. Groop, Nutrition, Metabolism and Cardiovascular Diseases (2018), 28(5), pp. 470-476


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