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Aim:  To characterize the impact of the German strategy for containment of Coronavirus SARS-CoV-2 (social distancing and lockdown) on the training, other habitual physical activity, and sleep in highly trained kayakers and canoeists.   Method:  During the 4 weeks immediately prior to and following the beginning of the German government's strategy for containment of Coronavirus SARS-CoV-2 on March 23, 2020, 14 highly trained athletes (VO 2peak : 3,162 ± 774 ml/min; 500-m best time: 117.9 ± 7.9 s) wore a multi-sensor smartwatch to allow continuous assessment of heart rate, physical activity, and sleep duration.   Result:  In comparison to before lockdown, the overall weekly training time and the average length of each session of training during the lockdown decreased by 27.6% ( P  = 0.02;  d  = 0.91) and 15.4% ( P  = 0.36;  d  = 0.36), respectively. At the same time, the number of sessions involving specific (i.e., canoeing and kayaking) and non-specific (i.e., running, cycling) training, respectively, did not change ( P  = 0.36–0.37;  d  = 0.34–0.35). The number of sessions involving strength (+17.4%;  P  = 0.03;  d  = 0.89) or other types of training (+16.7%;  P  = 0.06;  d  = 0.75) increased during the lockdown with 2.8–17.5% more training time involving a heart rate <60%, 82–88, 89–93, or 94–100% of individual peak heart rate (HR peak ) ( P  = 0.03–0.86;  d  = 0.07–1.38), and 4.3–18.7% less time with a heart rate of 60–72 or 73–83% HR peak  ( P  = < 0.001–0.0.26;  d  = 0.44–2.24). The daily duration of sleep was ~30 min (6.7%) longer during the lockdown ( P  < 0.001;  d  = 1.53) and the overall time spent lying down was 17% greater ( P  < 0.001;  d  = 2.26); whereas sitting time (−9.4%;  P  = 0.003;  d  = 1.23), the duration of light (15 min; −7.3%;  P  = 0.04;  d  = 0.83), and moderate (−18.6%;  P  = 0.01;  d  = 1.00) physical activity other than training (−9.4%;  P  = 0.22;  d  = 0.00) were all lower during lockdown.   Conclusion:  The present data revealed that following the German lockdown for containment of the Coronavirus SARS-CoV-2, highly trained kayakers and canoeists spent less overall time training each week (−27.6%) with, on average, shorter training sessions (−15.1%) and less light-to-moderate physical activity outside of training. Moreover, they performed more strength training sessions per week, and all engaged in more training at intensities >82 and <60% of HR peak  and spent longer periods lying down and sleeping during the lockdown.

frontiers in sports and active living

The Impact of the German Strategy for Containment of Coronavirus SARS-CoV-2 on Training Characteristics, Physical Activity and Sleep of Highly Trained Kayakers and Canoeists: A Retrospective Observational Study