Trial reportPloS one2026
Acute effects of intermittent hypoxia-hyperoxia exposure on cardiovascular autonomic function and blood pressure in sedentary older adults: A pilot randomized controlled trial.
Trial report in PloS one, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
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Authors and funding
6 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThe aim of this study was to evaluate the acute effects of a single session of intermittent hypoxia-hyperoxia exposure on cardiovascular autonomic regulation, blood pressure, and arterial oxygen saturation in sedentary older adults.
methodsA double-blind randomized controlled trial with pre- and post-intervention assessment was conducted in a residential care physiotherapy setting. Sixteen sedentary older adults were randomly assigned to an experimental group (n = 8) or a control group (n = 8). The experimental group received one session of intermittent hypoxia-hyperoxia exposure consisting of six cycles of hypoxia (FiO₂ 10-14% for 5 minutes) followed by hyperoxia (FiO₂ 30-40% for 3 minutes), administered via a hypoxic generator. The control group received a sham intervention consisting of normoxic breathing (FiO₂ 21%). Heart rate variability (SDNN, RMSSD, LF/HF), systolic and diastolic blood pressure, heart rate, and arterial oxygen saturation were measured at baseline and immediately after the intervention.
resultsCompared with the control group, the experimental group showed significant increases in SDNN and RMSSD and a significant reduction in the LF/HF ratio (p < 0.01), indicating improved autonomic regulation. Systolic and diastolic blood pressure and heart rate decreased significantly in the experimental group compared with controls (p < 0.01). Arterial oxygen saturation showed a small but significant increase in the experimental group (p < 0.01). No adverse events or withdrawals were reported.
conclusionsIn this pilot randomized controlled trial, a single session of intermittent hypoxia-hyperoxia exposure was associated with acute changes in heart rate variability indices and blood pressure in sedentary older adults. These preliminary findings should be interpreted cautiously and require confirmation in larger, adequately powered trials.
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