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• W2568692279 abstract "Objective. Hypoxic exposure can be used as a therapeutic tool by inducing various cardiovascular, neuromuscular and metabolic adaptations. Hypoxic conditioning strategies have been evaluated in patients with chronic diseases using either sustained (SH) or intermittent (IH) hypoxic sessions. Whether hypoxic conditioning via SH or IH may induce different physiological responses remains to be elucidated. Methods. Fourteen healthy active subjects (7 females, age 25±8 yrs, body mass index 21.5±2.5 kg·m-2) performed two interventions in a single blind, randomized cross-over design, starting with either 3x SH (48 h apart), or 3x IH (48 h apart), separated by a 2 week washout period. SH sessions consisted of breathing a gas mixture with reduced inspiratory oxygen fraction (FiO2), continuously adjusted to reach arterial oxygen saturations (SpO2) of 70-80% for 1 hour. IH sessions consisted of 5 min with reduced FiO2 (SpO2=70-80%), followed by 3-min normoxia, repeated 7 times. During the first (S1) and third (S3) sessions of each hypoxic intervention, cardiorespiratory parameters, and muscle and pre-frontal cortex oxygenation (near infrared spectroscopy) were assessed continuously. Results. Minute ventilation increased significantly during IH sessions (+2±2 L·min-1) while heart rate increased during both SH (+11±4 bpm) and IH (+13±5 bpm) sessions. Arterial blood pressure increased during all hypoxic sessions, although baseline normoxic systolic blood pressure was reduced from S1 to S3 in IH only (-8±11 mmHg). Muscle oxygenation decreased significantly during S3 but not S1, for both hypoxic interventions (S3: SH -6±5%, IH -3±4%); pre-frontal oxygenation decreased in S1 and S3, and to a greater extent in SH versus IH (-13±3% versus -6±6%). Heart rate variability indices indicated a significantly larger increase in sympathetic activity in SH versus IH (lower SDNN, PNN50 and RMSSD values in SH). From S1 to S3, further reduction in heart rate variability was observed in SH (SDNN, PNN50 and RMSSD reduction) while heart rate variability increased in IH (SDNN and RMSSD increase). Conclusions. These results showed significant differences in heart rate variability, blood pressure and tissue oxygenation changes during short-term SH versus IH conditioning interventions. Heart rate variability may provide useful information about the early adaptations induced by such intervention." @default.
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• W2568692279 date "2017-01-10" @default.
• W2568692279 modified "2023-10-01" @default.
• W2568692279 title "Physiological Responses to Two Hypoxic Conditioning Strategies in Healthy Subjects" @default.
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• W2568692279 doi "https://doi.org/10.3389/fphys.2016.00675" @default.
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