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Relations (1)
related 3.00 — strongly supporting 7 facts
Heart rate and tidal volume are both key cardiorespiratory variables measured and analyzed in studies of physiological responses to hypoxia, as evidenced by their joint inclusion in experimental protocols [1] and statistical power analyses {fact:2, fact:7}. Furthermore, research consistently compares how these two parameters change in response to hypoxic conditions [2] and how their values differ between sexes {fact:4, fact:5, fact:6}.
Facts (7)
Sources
Sex differences in cardiorespiratory control under hypoxia - Frontiers frontiersin.org 7 facts
claimExposure to iso-saturation hypoxia causes increases in heart rate, cardiac output, low-frequency bands of R-R intervals, blood pressure, tidal volume, and ventilation, while causing decreases in baroreflex sensitivity, total power, and the high-frequency band of R-R intervals.
claimWhen analyzing sex as a factor in iso-saturation hypoxia, females exhibit a higher heart rate and cardiac output index, but lower tidal volume, ventilation, and low-frequency band of blood pressure compared to males.
claimUnder iso-time hypoxia, females exhibit higher heart rates, cardiac output, and total vascular conductance, while males exhibit higher tidal volume, ventilation, and low-frequency bands of blood pressure.
claimUnder hypoxic iso-saturation, females have higher heart rates and a greater low-frequency band response of heart rate variability compared to males, while males present a higher tidal volume.
measurementA power analysis for the study revealed large effect sizes (f) of 0.68 for oxygen saturation (SpO2), 0.61 for heart rate (HR), and 0.52 for tidal volume (Vt).
procedureThe experimental protocol for the study on sex differences in cardiorespiratory control under hypoxia involved recording hemodynamic variables (heart rate, stroke volume, cardiac output, blood pressure) and respiratory variables (breathing frequency, tidal volume, minute ventilation, SpO2) after a 20-minute rest period in a sitting position.
procedureThe sample size for variables including SpO2 (iso-time) and HR and Vt (iso-saturation) was calculated using G*Power 3.1.9.7 software (Heinrich-Heine-Universität, Düsseldorf, Germany) with a β of 0.80 and an α of 0.05.