title: Autonomic modulations of heart rate variability and performances in short-distance elite swimmers.
abstract: OBJECTIVE
  Endurance exercise is associated with high cardiac vagal tone, but how the cardiac autonomic control correlates with shorter anaerobic performances is unknown. Therefore, the aim of this study was to evaluate how autonomic modulations of heart rate (HR) variability (V) correlate with performances of short- (<1 min) and very short (<30 s) duration in elite athletes.
  
  
  METHODS
  Thirteen male swimmers, national-level crawl specialists in short (100-m) and very short (50-m) distances, were enrolled. HR was recorded during 15-min supine rest: (1) in the morning after wake up, (2) in the afternoon before sprint-oriented training sessions, (3) few minutes after training (first recovery phase after swimming cooldown). Heart rate variability (HRV) vagal and sympatho/vagal indices were calculated in time, frequency and complexity domains. Correlations of best seasonal times on 100- or 50-m distances with HRV indices and the velocity at blood lactate accumulation onset (V OBLA) were calculated.
  
  
  CONCLUSIONS
  Vagal indices were highest in the morning where they positively correlated with very short-distance times (higher the index, worse is the 50-m performance). Sympatho/vagal indices were highest after training where they negatively correlated with short-distance times (higher the index, better is the 100-m performance). V OBLA did not correlate with the performances. Therefore, autonomic HRV indices and not V OBLA predict short and very short, most anaerobic, performances. Results also suggest that a strong cardiac vagal control has no effect on short performances and is even detrimental to very short performances, and that the capacity to powerfully increase the sympathetic tone during exercise may improve short, but not very short performances.
authors.affiliation: Department of Biomedical Sciences for Health, University of Milan, Via Colombo, 71, Milan, Italy.
authors.forename: Giampiero
authors.initials: G
authors.lastname: Merati
authors.forename: Martina Anna
authors.initials: MA
authors.lastname: Maggioni
authors.forename: Pietro Luigi
authors.initials: PL
authors.lastname: Invernizzi
authors.forename: Claudio
authors.initials: C
authors.lastname: Ciapparelli
authors.forename: Luca
authors.initials: L
authors.lastname: Agnello
authors.forename: Arsenio
authors.initials: A
authors.lastname: Veicsteinas
authors.forename: Paolo
authors.initials: P
authors.lastname: Castiglioni
mesh_terms: D000328:Adult; D056352:Athletes; D054874:Athletic Performance; D006339:Heart Rate; D006801:Humans; D008297:Male; D010807:Physical Endurance; D013550:Swimming / Q000502:physiology*; D014630:Vagus Nerve / Q000502:physiology*