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EFFECT OF HIGH VELOCITY/HYPEROXIC BREATHING THERAPY ON BLOOD LACTATE DECLINE AND FATIGUE RATING AFTER A WINGATE TEST

Abstract

BACKGROUND: Sprint-type exercise of 30-60s elevates blood lactate concentration ([La-]b) causing acidosis and fatigue. Post-exercise, [La-]b peaks within 4-7min, then gradually returns towards baseline over an hour. High velocity breathing therapy (HVT) delivers not only O2 but is also purported to improve CO2 elimination and ventilatory efficiency by clearing the anatomical dead space. HVT offers the intriguing possibility of hastening [La-]b decline and speeding recovery. The present study investigated HVT's impact on [La-]b decline after intense exercise (Wingate test). METHODS: 15 participants (8M; 7F; 26±2y) completed a 30s Wingate test, followed by 60min of recovery under 4 randomized HVT conditions: 21% O2 at 5L/min, 21% O2 at 35L/min, 100% O2 at 5L/min, and 100% O2 at 35L/min. Cycle ergometer resistance was set at 0.085 kp/kg body mass. Assessments included Perceived Recovery Status, Rating-of-Fatigue, and physiological measurements (breath frequency, heart rate, arterial O2 saturation, blood pressure). Blood samples were collected pre-exercise and during recovery. RESULTS: As planned, recovery status was the same prior to each test (p = 0.2759), as were Wingate performance metrics, including peak power (p = 0.3896), final power (p = 0.2801), and fatigue index (p = 0.2046). Arterial O2 saturation was significantly higher during both hyperoxic conditions (p < 0.0001) throughout most of recovery. Heart rate (p = 0.0897), systolic blood pressure (p = 0.874) and diastolic blood pressure (p = 0.4687) were not significantly different among conditions. Rating of fatigue improved throughout recovery with no difference among conditions (p = 0.6773). Breath frequency was significantly lower with 35 L/min HVT (p < 0.0001) regardless of O2 level. Although [La-]b was not significantly different among conditions at any sample time (p = 0.0733), there was a tendency for a significantly smaller area under the curve over the entire recovery period for 100% O2 at 35L/min (p = 0.0530). CONCLUSIONS: Limited significant effects of HVT and hyperoxia were observed, but there were trends for a slightly lower breath frequency and a smaller area under the curve in venous [La-]b in the 35L/100% condition. FUNDING: Contract from Vapotherm, Inc. Authors Bergeski and Whittle are employees of Vapotherm, Inc. Study design and implementation were independently approved and performed by Auburn University researchers.

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