Key result
Post-exercise hypotension after sprint interval leg cycling in hypoxia was not affected by either normoxic or hypoxic recovery, with mean arterial pressure decreasing similarly in both conditions.
Why the study?
The study investigated the effects of normoxic versus hypoxic recovery conditions on post-exercise hemodynamics following sprint interval leg cycling exercise.
Does hypoxic recovery compared to normoxic recovery alter mean arterial pressure in healthy young men after sprint interval cycling in hypoxia?
RCT (n=10)
Single-blind
Random order (crossover)
No
Does hypoxic recovery compared to normoxic recovery alter mean arterial pressure in healthy young men after sprint interval cycling in hypoxia?
Post-exercise hypotension after sprint interval cycling in hypoxia is not affected by whether the recovery period is hypoxic or normoxic, despite marked differences in oxygen saturation.
Answers are grounded in this paper and cite their sources.
Hypoxic recovery does not alter post-exercise hypotension after hypoxic sprint cycling; confirms the response is driven by the exercise bout independent of recovery oxygenation.
The aim of this study was to investigate the effects of either normoxic or hypoxic recovery condition on post-exercise hemodynamics after sprint interval leg cycling exercise rather than hemodynamics during exercise. The participants performed five sets of leg cycling with a maximal effort (30 s exercise for each set) with a 4-min recovery of unloaded cycling between the sets in hypoxia [fraction of inspired oxygen (FiO 2 ) = 0.145]. The load during pedaling corresponded to 7.5% of the individual’s body weight at the first set, and it gradually reduced from 6.5 to 5.5%, 4.5, and 3.5% for the second to fifth sets. After exercise, the participants rested in a sitting position for 30 min under normoxia (room-air) or hypoxia. Mean arterial pressure decreased over time during recovery ( p < 0.001) with no condition and interaction effects ( p > 0.05). Compared to pre-exercise values, at 30 min after exercise, mean arterial pressure decreased by 5.6 ± 4.8 mmHg (mean ± standard deviation) during hypoxic recovery, and by 5.3 ± 4.6 mmHg during normoxic recovery. Peripheral arterial oxygen saturation (SpO 2 ) at all time points (5, 10, 20, and 30 min) during hypoxic recovery was lower than during normoxic recovery (all p < 0.05). The area under the hyperemic curve of tissue oxygen saturation (StO 2 ) at vastus lateralis defined as reperfusion curve above the baseline values during hypoxic recovery was lower than during normoxic recovery ( p < 0.05). Collectively, post-exercise hypotension after sprint interval leg cycling exercise was not affected by either normoxic or hypoxic recovery despite marked differences in SpO 2 and StO 2 during recovery between the two conditions.
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Horiuchi et al. (2022) conducted an RCT in Healthy (n=10). Hypoxic recovery vs. Normoxic recovery (room air) was evaluated on Decrease in mean arterial pressure (MAP) at 30 minutes post-exercise (p=>0.05). Post-exercise hypotension after sprint interval leg cycling in hypoxia was not affected by either normoxic or hypoxic recovery, with mean arterial pressure decreasing similarly in both conditions.
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