Abstract
Apnoea diving or freediving is diving with no air supply. It requires only basic equipment like mask, fins and snorkel. Freediving equipment is specifically designed to assist in apnoea diving. The lips of freediving masks usually have a single instead of a double sealing lip and a smaller air volume. This reduces the additional functional dead space caused by the mask. The fins have larger blades and made out of carbon. With long unbroken stokes and good efficiency due to the shape of the fins, energy consumption is reduced. Also, monofins are commonly used for freediving. With them divers have different movements compared to conventional fins and hence exert different muscles. In general, both fin types are equally suitable for freediving. The choice is more or less a personal preference. Snorkels should have a sufficient diameter (1.5–2.5 cm) and should not be too long (35 cm). With regular snorkels alone, normal respiration approximately is reduced by 70%. Therefore, snorkels are not used in freediving competitions. If the diameter is too small, CO2 elimination may be decreased as airflow resistance might be increased. This results in poor ventilation. In contrast, a too wide and long snorkel increases functional dead space and leads to CO2 retention. Diving with snorkels of 1 m or longer causes an increased pulmonary negative pressure in immersed divers. This can result in inability of respiratory muscles to expand the lungs against the ambient pressure. This might result in increased respiratory rate, as breathing reflexes are reinforced by chest compressions. Additionally, inhalation is significantly reduced by the increased ambient pressure. Moreover, on exhalation, the lower limit of the residual volume is exceeded. Hence, pulmonary hypobaric barotrauma may develop. The maximum length of the snorkel should not exceed 50 cm (◘ Fig. 27.1).
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
AIDA International. AIDA International World Records. International Association for Development of Apnea. Available at https://www.aidainternational.org/WorldRecords. Accessed 5 Oct 2007.
AIDA International. www.aidainternational.org. Accessed 11.9.2015.
CMAS. www.CMAS.org. Assessed 14.7.2015.
Lindholm P, Lundgren CE. The physiology and pathophysiology of human breath-hold diving. J Appl Physiol. 2009;106(1):284–92.
Lindholm P, Lundgren CEG. Alveolar gas composition before and after maximal breath-holds in competitive divers. UHM. 2006;33(6):463 – Hypocapnia and Static Apnea.
Otteni CE, Kernagis DN, White WD, Freiberger JJ. Swimming-Induced pulmonary edema pathophysiology and risk reduction with sildenafil. Circulation. 2016;133:988–996; originally published online February 16, 2016; https://doi.org/10.1161/CIRCULATIONAHA.115.019464
Mithoefer JC. Breath holding. In: Handbook of physiology. Section 3: respiration, vol. II. Washington DC: AmericanPhysiologicalSociety; 1964. p. 1011–25.
Riede UN, Werner M, Freudenberg N. Basiswissen Allgemeine und Spezielle Pathologie. 2nd ed. Stuttgart: Georg Thieme Verlag; 2009.
Silbernagel S, Despopuluos A. Taschenatlas der Physiologie. 7th ed. Stuttgart: Thieme; 2007.
Suggested Reading
Lundgren CEG. Freediving science. In: Lindholm P, Pollock NW, Lundgren CEG, editors. Breath-hold diving. Proceedings of the Undersea and Hyperbaric Medical Society/Divers Alert Network 2006 June 20–21 Workshop. Durham, NC: Divers Alert Network; 2006.
Gempp E, Blatteau JE. Neurological disorders after repetitive breath-hold diving. Aviat Space Environ Med. 2006;77(9):971–3.
Gold D, Aiyarak S, Wongcharoenyong S, Geater A, Juengprasert W, Gerth WA. The indigenous fisherman divers of Thailand: diving practices. Int J Occup Saf Ergon. 2000;6(1):89–112.
Gold D, Geater A, Aiyarak S, Wongcharoenyong S, Juengprasert W, Johnson M, et al. The indigenous fisherman divers of Thailand: diving-related mortality and morbidity. Int J Occup Saf Ergon. 2000;6(2):147–67.
Lewis PR. Skin diving fatalities in New Zealand. N Z Med J. 1979;89(638):472–5.
Mangge H, Plecko B, Grubbauer HM, Popper H, Smolle-Jüttner F, Zach M. Late-onset miliary pneumonitis after near drowning. Pediatr Pulmonol. 1993;15(2):122–4.
Moon RE, Martina SD, Peacher DF, Potter JF, Wester TE, Cherry AD, Natoli MJ, Eng M, Orlowski JP. Drowning, near-drowning, and ice-water submersions. Pediatr Clin N Am. 1987;34(1):75–92.
Papa L, Hoelle R, Idris A. Systematic review of definitions for drowning incidents. Resuscitation. 2005;65(3):255–64.
Suominen P, Baillie C, Korpela R, Rautanen S, Ranta S, Olkkola KT. Impact of age, submersion time and water temperature on outcome in near-drowning. Resuscitation. 2002;52(3):247–54.
Author information
Authors and Affiliations
Rights and permissions
Copyright information
© 2018 Springer International Publishing AG, part of Springer Nature
About this chapter
Cite this chapter
Rusoke-Dierich, O. (2018). Apnoea Diving. In: Diving Medicine. Springer, Cham. https://doi.org/10.1007/978-3-319-73836-9_27
Download citation
DOI: https://doi.org/10.1007/978-3-319-73836-9_27
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-73835-2
Online ISBN: 978-3-319-73836-9
eBook Packages: MedicineMedicine (R0)