Hmmm, not sure if the video was up or not, since I just got an email that it was posted...but, Ill just re-post with notes here since the studies are on there as well. TL;DW version - 1. Hypoxia is usually with at FiO2 of 12-16% (Fraction of inspired oxygen) 2. Chronic (days) hypoxia, or severe hypoxia (sub 12%) can have skeletal muscle losses opposed to increases, when measured in teh rats, going from a 5 fold increase in degradation with a 1.5 increase in protein synthesis rate. 3. Acute (few hours) hypoxia has increased synthesis without the degradation, usually resulting in increased hypertrophy/strength adaptations compared to normoxic training. 4. Studies using either low-fatigue work and/or long rest periods negates the benefits of hypoxic training. 5. Compared to occlusion training, heightened metabolites enter systemic circulation too fast when using 90s+ rest periods to have an effect, while with occlusion they stay relatively localized. 6. Although compared to occlusion, hypoxia doesnt have the decrement in RPE/Borg scales. Rate of perceived exhaustion seems the same compared to normoxic training at equal intensity (%1RM) 7. One reason that too severe hypoxia might not be beneficial could be the lowered cerebral oxygenation and the central governor theory, which is opposed by the anaerobiosis theory. 8. Restricted breathing CAN cause hypoxia/hypoxemia, as shown in sleep apnea and certain forms of COPD, despite not in a hypoxic environment and ambiently normobaric. 9. Elevation masks may or may not do anything, same goes for the power lung. Studies: Acute vs chronic hypoxia: what are the consequences for skeletal muscle mass? cellularandmolecularexercisephysiology/index.php/CMEP/article/view/e5 Intermittent hypoxic resistance training: does it provide added benefit? journal.frontiersin.org/Journal/112767/full Cardiovascular disease in obstructive sleep apnoea syndrome: the role of intermittent hypoxia and inflammation erj.ersjournals/content/33/5/1195.long Effects of acute hypoxia on metabolic and hormonal responses to resistance exercise. ncbi.nlm.nih.gov/pubmed/20019623 Effects of resistance exercise under hypoxic conditions ors.org/Transactions/56/1598.pdf Effects of resistance training combined with vascular occlusion or hypoxia on neuromuscular function in athletes. ncbi.nlm.nih.gov/pubmed/23412543 Effects of resistance training under hypoxic conditions on muscle hypertrophy and strength. ncbi.nlm.nih.gov/pubmed/24690432 Effects of systemic hypoxia on human muscular adaptations to resistance exercise training physreports.physiology.org/content/2/6/e12033.long Evidence that a central governor regulates exercise performance during acute hypoxia and hyperoxia jeb.biologists.org/content/204/18/3225.full Hypoxia and resistance exercise: a comparison of localized and systemic methods. ncbi.nlm.nih.gov/pubmed/24715613 Hypoxia increases muscle hypertrophy induced by resistance training. ncbi.nlm.nih.gov/pubmed/21266734 https://youtube/watch?v=3KvUKWDzT1U
Posted on: Thu, 23 Oct 2014 19:12:39 +0000
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