%0 Journal Article %T Heart Rate Variability in Elite Swimmers before, during and after COVID-19 Lockdown: A Brief Report on Time Domain Analysis %+ Fédération Française de Natation (FFN) %+ Institut de recherche biomédicale et d’épidémiologie du sport (IRMES - URP_7329) %+ Laboratoire "Mobilité, Vieillissement, Exercice" (MOVE) (MOVE) %+ Université de Montréal (UdeM) %+ Queensland Academy of Sport %+ Universidad Finis Terrae %+ University of the Basque Country/Euskal Herriko Unibertsitatea (UPV/EHU) %A Pla, Robin %A Bosquet, Laurent %A Mcgibbon, Katie %A Mujika, Iñigo %A Aubry, Anaël %< avec comité de lecture %@ 2076-3417 %J Applied Sciences %I Multidisciplinary digital publishing institute (MDPI) %V 11 %N 17 %P 8106 %8 2021 %D 2021 %R 10.3390/app11178106 %K Physiology %K Swimming %K Monitoring %K Training load %K Home confinement %Z Humanities and Social Sciences/Sport/Sport physiology %Z Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO]Journal articles %X Background: Many athletes worldwide have endured home confinement during the COVID-19 pandemic, and their opportunities to train were strongly limited. This study describes the impact of lockdown on training volume and heart rate variability (HRV) in elite swimmers.Methods: HRV data of seven elite males were collected each Monday morning over 20 weeks, including 8 weeks of lockdown. The training volume was quantified retrospectively.Results: During the lockdown period (weeks 4–11) swimming was not allowed, and the total training volume was reduced by 55.2 ± 7.5% compared to the baseline volume (from 27.2 to 12.2 training hours). This drop was associated with a decrease in vagal activity (a 9.2 ± 5.4% increase in resting HR and a 6.5 ± 3.4% decrease in the natural logarithm of rMSSD from baseline values). After the lockdown (weeks 12–20), the training volume was gradually increased before attaining 68.8% and 88.2% of the baseline training volume at weeks 15 and 17, respectively. Resting HR and Ln rMSSD returned to baseline values four weeks after the lockdown.Conclusions: The lockdown period induced a decreased training volume which was associated with a decrease in vagal activity. However, HRV values returned to the baseline 4 weeks after the resumption of swimming training. %G English %2 https://insep.hal.science//hal-03633879/document %2 https://insep.hal.science//hal-03633879/file/applsci-11-08106-v2.pdf %L hal-03633879 %U https://insep.hal.science//hal-03633879 %~ SHS %~ UNIV-POITIERS %~ INSEP %~ UNIV-PARIS %~ UNIVERSITE-PARIS %~ UP-SANTE %~ MOVE-UP