End-tidal CO2 relates to seasickness susceptibility: A study in Antarctic voyages.

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End-tidal CO2 relates to seasickness susceptibility: A study in Antarctic voyages.

Auris Nasus Larynx. 2016 Dec 13;:

Authors: Hasegawa T, Oe H, Taki M, Sakaguchi H, Hirano S, Wada Y

Abstract
OBJECTIVE: To investigate the relationship between end-tidal CO2 (EtCO2) and seasickness (motion sickness at sea) during an Antarctic voyage.
METHODS: In this study, we measured EtCO2 and severity of seasickness using the subjective symptoms of motion sickness (SSMS). We sampled EtCO2 and SSMS every 3-4h for 3 days from the date of sail in 16 healthy subjects. This experiment was performed on an icebreaker (standard displacement: 12,650t).
RESULTS: Since 2 subjects dropped out because of severe motion sickness, available data were collected from 14 subjects. On analysis of all data of all subjects grouped together, there seemed to be a significant negative correlation between EtCO2 and SSMS (R=-0.27, P=0.0005). However, in individual subjects, this correlation was not obvious. During the voyage, EtCO2 level in the seasickness susceptible group was lower than that in the non-susceptible group (P=0.018). Both EtCO2 increasing in the non-susceptible group and decreasing in the susceptible group contribute to the difference in EtCO2 levels. We suggest that the cause of this increase in EtCO2 level in the non-susceptible group was unwitting slow and deep breathing to resist seasickness.
CONCLUSION: We revealed that for seasickness during an Antarctic voyage, EtCO2 level relates to susceptibility, but not occurrence or severity. Measurement of EtCO2 levels may be useful to identify seasickness-susceptible persons and to efficiently prevent seasickness.

PMID: 27986366 [PubMed - as supplied by publisher]

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