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Ph.D. defence by Mikkel Porsborg Andersen

Klinisk Institut, Aalborg Universitet og Aalborg Universitetshospital har den glæde at invitere til ph.d.-forsvar ved BSc, MSc.PH, Mikkel Porsborg Andersen, Enhed for Epidemiologi og Biostatistik, som forsvarer ph.d.-afhandlingen: Insights into relations and mechanisms that connect physical fitness and scholas-tic abilities in a Danish cohort of school youth - Epidemiological studies

Tidspunkt

07.05.2018 kl. 13.00 - 07.05.2018 kl. 16.00

Beskrivelse

Ph.d.-forsvaret finder sted

Mandag den 7. maj 2018 kl. 13.00
I auditoriet, Aalborg Universitetshospital, Syd

Forsvaret vil være på engelsk

Efterfølgende er der reception. Alle er velkomne.

 

PhD supervisors

Prof. Christian Torp-Pedersen
Department of Health Science and Technology, Aalborg University, Denmark
Unit of Epidemiology and Biostatistics, Aalborg University Hospital, Denmark

Co-supervisors:
Associate Prof. Henrik Bøggild
Department of Health Science and Technology, Aalborg University, Denmark
Unit of Epidemiology and Biostatistics, Aalborg University Hospital Denmark

Associate Prof. Henrik Vardinghus-Nielsen
Department of Health Science and Technology, Aalborg University, Denmark

Associate Prof. Theis Lange
Department of Public Health, Faculty of Health and Medical Science
University of Copenhagen, Denmark
Center for Statistical Science, Peking University, Beijing, China

 

PhD assessment committee

Prof. Sine Agergaard (Chairman)
Department of Health Science and Technology
Aalborg University, Denmark

Associate Prof. Gabriele Berg-Beckhoff
The Unit of Health Promotion Research
University of Southern Denmark

Assistant Prof. Sonja Alsemgeest Swanson
Department of Epidemiology, Erasmus Medical Center, Rotterdam, the Netherlands
Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, USA

 

Abstract

By linking objectively measured physical fitness defined as VO2max (mL·kg-1·min-1) from a baseline sample of 1164 pupils to their scholastics abilities obtained from the Danish nationwide administrative registries. The objective of this Ph.D. dissertation was to achieve a deeper insight into mechanisms and relations through which pupils’ physical fitness may influence scholastic abilities. This was initiated through three studies that identify pathways that form the interrelation between pupils' physical fitness, scholastic abilities, and their family background. Study 1 showed pupils’ physical fitness was positively associated with their academic achievements for both sexes in all scholastic subjects. Even though family socioeconomic status (SES) influenced the association no effect differences among SES groups were established indicating that the association was independent of SES In study 2 pupils’ physical fitness was found to be positively related to their commencement in post-compulsory education with a total effect OR of 1.87 (95%CI:1.30;2.73). Splitting the total effect, the direct pathway showed a OR of 1.36 (95%CI:0.93;1.98) and a OR of 1.37 (95%CI:1.20;1.57) for the indirect pathway operating through pupils’ academic achievements with proportions mediated of 51% (95%CI:27%;122%). Study 3 showed that pupils’ physical fitness mediated the relation between family SES groups and pupils’ academic achievements. When family SES was based on family education the estimates showed decrease or increase in grade point average of the total effects that the natural indirect effects are accountable for. The indirect effect estimates of changes in grades was -0.13 (95%CI:-0.26;-0.01), 0.07 (95%CI:0.00;0.14) and 0.24 (95%CI:0.14;0.34) for pupils from family SES group one, three and four, respectively, compared to pupils from family SES group two for all comparisons. The proportion mediated through pupils’ physical fitness correspond to 18% (95%CI:1%;57%), 6% (95%CI:0%;13%) and 12% (95%CI:7%;18%) for the same comparisons of family SES groups. When family SES was based on family income the estimates show the decrease or increase in grade point average of the total effects that can be assigned to the natural indirect effects. The indirect effect estimates of changes in grades -0.07 (95%CI:-0.16;0.02), 0.22 (95%CI:0.13;0.32) and 0.26 (95% CI:0.15;0.37) for pupils from family SES group one, three and four, respectively, compared to pupils from family SES group two for all comparisons. The mediated proportions through pupils’ physical fitness correspond to 12% (95%CI:-6%;41%), 30% (95%CI:16%;54%) and 20% (95%CI:12%;32%) for the same comparisons of family SES groups. Throughout, this dissertation pupils’ physical fitness was consistently established as a relevant factor in relation to the pupils' scholastic abilities by providing evidence of different pathways through which pupils’ physical fitness was positively related to scholastic abilities. All three studies positively linked pupils physical fitness to their academic achievements and further showed that the physical fitness positively influenced commencement in post-compulsory education with the establishing of pupils academic achievements as a mediating mechanism on the relation. Not unexpected, the family SES of the pupils was shown to influence the connection between physical fitness and academic achievements. Pupils’ physical fitness was shown to both influences their academic achievements independently of the family SES as well as the physical fitness acted as a mediating mechanism on the pathway between family SES and academic achievements.

Arrangør

Department of Clinical Medicine, Aalborg University

Adresse

Auditoriet, Aalborg Universitetshospital, Syd, Hobrovej 18-22

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