Heart Rate Responses During a Breath-Holding Competition in Well-Trained Divers
F. Lemaître1
, F. Bernier2
, I. Petit3
, N. Renard4
, B. Gardette5
, F. Joulia6
1Centre d'Etudes des Transformations des Activités Physiques et Sportives (CETAPS), UPRES JE n°2318, Faculté des Sciences du Sport et de l'Education Physique de Rouen, Université de Rouen, France
2Dr en Médecine Subaquatique et Hyperbare, Saint Nazaire, France
3Laboratoire d'Explorations Fonctionnelles Respiratoires et Sportives, Hôpital Gabriel-Montpied, Clermont-Ferrand, France
4Vétérinaire-DEFV, Lyon, France
5Directeur Scientifique COMEX, Marseille, France
6Laboratoire d'Ergonomie Sportive et Performance Motrice ESP, UPRES EA n°3162, UFRSTAPS de Toulon, Université de Toulon et du Var, La Garde, France
The diving response elicited by breath-holding (BH) and immersion mainly consists of bradycardia, decreased cardiac output, and peripheral vasoconstriction. These responses reduce oxygen consumption and thereby prolong the duration of the dive. They may also lead to cardiac arrhythmias or hypoxia, however, which in turn may play a role in the occurrence of syncope during BH. The aim of the present study was to analyze the cardiac responses to prolonged breath-holding in elite divers during a competition. Heart rate behaviour and the incidence of arrhythmia were recorded in 16 well-trained breath-hold divers (BHD) using a cardio-frequency meter (for 15 divers) and a Holter (for one diver) during maximal static breath-holding. Anthropometric, spirometric, and training characteristics such as percentage of body fat, pulmonary volumes and years of BH training were also determined. Forced vital capacity (FVC) and forced expiratory volume in one second (FEV1) were higher than the predicted values (+ 7.7 %, p < 0.05 and + 6.6 %, p < 0.05, respectively). During the static BH, divers presented apneic bradycardia (- 44 %) correlated with static BH times (p < 0.05); this was associated with cardiac arrhythmias (supraventricular extrasystoles and ventricular extrasystoles) in the Holter-equipped subject. These results are in agreement with those obtained in laboratory conditions and confirm the existence of cardiac arrhythmias in well-trained BHD.
Key words
Loss of consciousness - heart rate - training
References
1 Andersson J PA. Cardiovascular and Respiratory Effects of Apnea in Humans. Lund; Department of Animal Physiology 2001: 49
6
Brignole M, Menozzi C, Bottoni N, Gianfranchi L, Lolli G, Oddone I, Gaggioli G.
Mechanisms of syncope caused by transient bradycardia and diagnostic value of electrophysiologic testing and cardiovascular reflexivity maneuvers.
Am J Cardiol.
1995;
76
273-278
9 Data P G. Loss of consciousness during breath-hold diving. Lundgren CEG The physiology of breath-hold diving. Buffalo, New York; Undersea & Hyperbaric Medical Society Worksho 1987: 274-283
10 Elsner R. The diving response: a comparison of animals and man. Lundgren CEG The Physiology of Breath-hold Diving. Buffalo, New York; Undersea & Hyperbaric Medical Society Worksho 1987: 148-157
12
Ferretti G, Ferrigno M, Grassi B, Marconi C, Lundgren C EG, Cerretelli P.
Alveolar gas composition and exchange during deep breath-hold diving and dry breath holds in elite divers.
J Appl Physiol.
1991;
70
794-802
13
Ferrigno M, Ferretti G, Costa M, Marconi C, Cerretelli P, Lundgren C.
Electrocardiogram during deep breath-hold dives by elite divers.
Undersea Biomed Res.
1991;
18
81-91
15
Hochachka P W.
Pinniped diving response mechanism and evolution: a window on the paradigm of comparative biochemistry and physiology.
Comp Biochem Physiol.
2000;
126
435-458
18 Landsberg P G. Hyperventilation: an unpredictable danger to the sports diver. Lundgren CEG The Physiology of Breath-hold Diving. Buffalo, New York; Undersea & Hyperbaric Medical Society Worksho 1987: 256-267
19 Lanphier E H. Breath-hold and ascent blackout. Lundgren CEG The Physiology of Breath-hold Diving. Buffalo, New York; Undersea & Hyperbaric Medical Society Workshop 1987: 32-43
22
Lin Y C, Hong S K.
Effects of hypercapnia, hypoxia and rebreathing on heart rate response during apnea.
J Appl Physiol: Respirat Environ Exercise Physiol.
1983;
54
166-171
25 McDonough J R, Barutt J P, Saffron J C. Cardiac arrhythmias as a precursor to drowning accidents. Lundgren CEG The Physiology of Breath-hold Diving. Buffalo, New York; Undersea & Hyperbaric Medical Society Worksho 1987: 212-229
30
Radermacher P, Muth C M, Santak B, Wenzel J.
A case of breath-holding and ascent-induced circulatory hypotension.
Undersea Biomed Res.
1993;
20
159-161
34
Schagatay E, Emanuelsson S, Holm B.
Effects of physical and apnea training on apneic time and the diving response in humans.
Eur J Appl Physiol.
2000;
82
161-169
40
Yamaguchi H, Obara S, Tanabe S, Utsuyama N, Takahashi A, Nakahira J, Yamamoto Y, Jiang Z-L, He J, Bando E, Miyamoto H.
Changes in cardiac rhythm in man during underwater submersion and swimming studied by ECG telemetry.
Eur J Appl Physiol.
1993;
66
43-48
Centre d'Etudes des Transformations des Activités Physiques et Sportives (CETAPS), UPRES JE n°2318, Faculté des Sciences du Sport et de l'Education Physique de Rouen, Université de Rouen
