Purpose: Tracking of physical activity (PA) and sport participation (SP) during motherhood is poorly understood. The purpose of the study was to analyze the extent of tracking of maternal PA and SP. Methods: In this investigation, data were collected from the Czech ELSPAC study subsample of 4811 and 2609 women measured postnatally (1991-1992) and after 11 years of follow-up (2002-2003), respectively. The structured questionnaire was used to assess the participation and average weekly time spent in PA, and the frequency of engaging in different sports (running, cycling, strength training, racket sports, swimming, and team sports). Tracking was calculated using generalized estimating equations (GEE) with beta coefficients (β), odds ratios (ORs), and 95% confidence intervals (95% CI). Results: Moderately high tracking coefficients were observed for cycling (β = 0.69, 95% 0.67-0.72), strength training (β = 0.59, 95% 0.56-0.63), and weekly time spent in PA (β = 0.53, 95% 0.38-0.66); meanwhile, moderate tracking coefficients were generated for swimming (β = 0.48, 95% 0.44-0.52), team sports (β = 0.44, 95% 0.39-0.48), racket sports (β = 0.44, 95% 0.39-0.48), and running (β = 0.35, 95% 0.30-0.40). Mothers who did not participate in PA at baseline were 81% more likely not to participate in it at follow-up (OR = 1.81, 95% CI 1.53-2.13). Conclusion: Cycling- and strength-related activities and weekly PA were tracked moderately-to-moderately high during motherhood. Moreover, the strong tracking of physical inactivity indicates that the detection of this risk factor before pregnancy should be advocated.

Department of General and Applied Kinesiology Faculty of Kinesiology University of Zagreb 10 000 Zagreb Croatia

Department of Research and Examination Faculty of Science Masaryk University Kotlarska 2 62 500 Brno Czech Republic

Department of Sport Motorics and Methodology in Kinanthropology Faculty of Sports Studies Masaryk University 62 500 Brno Czech Republic

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