Effects of Hook Maneuver on Oxygen Saturation Recovery After −40 m Apnea Dive—A Randomized Crossover Trial by Francisco DeAsís-Fernández, Álvaro Reina-Varona, Evangelos Papotsidakis, Juan Lafuente, José Fierro-Marrero

“…Significant differences in SpO₂ were observed between the HB and UB groups at 30–45 s post-apnea, with higher SpO₂ values in the HB group; between 1.64 and 5.08% of SpO₂ in favor of the HB intervention. …”
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