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Differential splenic responses to hyperoxic breathing at high altitude in Sherpa and lowlanders
Mittuniversitetet, Fakulteten för humanvetenskap, Institutionen för hälsovetenskaper (HOV). Syracuse University, Syracuse, NY, United States.
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2024 (Engelska)Ingår i: Experimental Physiology, ISSN 0958-0670, E-ISSN 1469-445X, Vol. 109, nr 4, s. 535-548Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The human spleen contracts in response to stress-induced catecholamine secretion, resulting in a temporary rise in haemoglobin concentration ([Hb]). Recent findings highlighted enhanced splenic response to exercise at high altitude in Sherpa, possibly due to a blunted splenic response to hypoxia. To explore the potential blunted splenic contraction in Sherpas at high altitude, we examined changes in spleen volume during hyperoxic breathing, comparing acclimatized Sherpa with acclimatized individuals of lowland ancestry. Our study included 14 non-Sherpa (7 female) residing at altitude for a mean continuous duration of 3 months and 46 Sherpa (24 female) with an average of 4 years altitude exposure. Participants underwent a hyperoxic breathing test at altitude (4300 m; barrometric pressure = ∼430 torr; (Formula presented.) = ∼90 torr). Throughout the test, we measured spleen volume using ultrasonography and monitored oxygen saturation ((Formula presented.)). During rest, Sherpa exhibited larger spleens (226 ± 70 mL) compared to non-Sherpa (165 ± 34 mL; P < 0.001; effect size (ES) = 0.95, 95% CI: 0.3–1.6). In response to hyperoxia, non-Sherpa demonstrated 22 ± 12% increase in spleen size (35 ± 17 mL, 95% CI: 20.7–48.9; P < 0.001; ES = 1.8, 95% CI: 0.93–2.66), while spleen size remained unchanged in Sherpa (−2 ± 13 mL, 95% CI: −2.4 to 7.3; P = 0.640; ES = 0.18, 95% CI: −0.10 to 0.47). Our findings suggest that Sherpa and non-Sherpas of lowland ancestry exhibit distinct variations in spleen volume during hyperoxia at high altitude, potentially indicating two distinct splenic functions. In Sherpa, this phenomenon may signify a diminished splenic response to altitude-related hypoxia at rest, potentially contributing to enhanced splenic contractions during physical stress. Conversely, non-Sherpa experienced a transient increase in spleen size during hyperoxia, indicating an active tonic contraction, which may influence early altitude acclimatization in lowlanders by raising [Hb]. 

Ort, förlag, år, upplaga, sidor
Wiley , 2024. Vol. 109, nr 4, s. 535-548
Nyckelord [en]
acclimatization, adaptation, high altitude, hypoxia, Sherpa, spleen function
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Fysiologi
Identifikatorer
URN: urn:nbn:se:miun:diva-50264DOI: 10.1113/EP091579Scopus ID: 2-s2.0-85181486793OAI: oai:DiVA.org:miun-50264DiVA, id: diva2:1828153
Tillgänglig från: 2024-01-16 Skapad: 2024-01-16 Senast uppdaterad: 2024-04-02Bibliografiskt granskad

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Holmström, Pontus K.Schagatay, Erika K.
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Institutionen för hälsovetenskaper (HOV)
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Experimental Physiology
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