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European Journal of Applied Physiology

, Volume 93, Issue 4, pp 447–452 | Cite as

Speed of spleen volume changes evoked by serial apneas

  • Erika Schagatay
  • Helena Haughey
  • Jenny Reimers
Original Article

Abstract

Diving mammals may enhance dive duration by injecting extra erythrocytes into the circulation by spleen contraction. This mechanism may also be important for apneic duration in humans. We studied the speed and magnitude of spleen volume changes evoked by serial apneas, and the associated changes in hematocrit (Hct) and hemoglobin (Hb) concentration, diving response and apneic duration. Three maximal apneas separated by 2 min rest elicited spleen contraction in all ten subjects, by a mean of 49 (27) ml (18%; P<0.001). During the same period, Hct and Hb rose by 2.2 and 2.4% respectively (P<0.01 and P<0.001), and apneic duration rose by 20 s (22% P<0.05). The mean heart rate reduction of the diving response was 15%, which remained the same throughout the apnea series. While the diving response was completely reversed between the apneas, spleen size was not recovered until 8–9 min after the final apnea corresponding with recovery of Hct and Hb. Thus, although the spleen contraction may be associated with the cardiovascular diving response, it is likely to be triggered by different mechanisms, and it may remain activated between dives spaced by short pauses. The two adjustments may provide a fast, quickly reversed, and a slow, but long-lasting, way of shifting to a diving mode in humans.

Keywords

Hemoconcentration Breath-hold Diving response Recovery 

Notes

Acknowledgements

We want to express our sincere gratitude to all subjects who participated in this study, to Staffan Pilström for developing the formula for spleen volume calculation, and to Marie Andersson for help with blood sampling and analysis. This study was supported by The Swedish National Center for Research in Sports, and research grants from Landstinget Västernorrland and Sundsvalls Sjukhus.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Erika Schagatay
    • 1
  • Helena Haughey
    • 1
  • Jenny Reimers
    • 2
  1. 1.Department of Natural and Environmental SciencesMid Sweden UniversitySundsvallSweden
  2. 2.X-ray clinicHärnösand HospitalHärnösandSweden

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