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Characterizing Hyperoxia-Induced Alterations in Muscular Physiology: Part 1


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Mechanisms underlying decreased aerobic performance after long duration 100 oxygen (O2) dives are unknown. 10 subjects completed 6-hour dry dives on 3 consecutive days while breathing 100 O2 at 1.35 ATA. Aerobic performance with metabolic and respiratory parameters were completed before diving, post-dive 3, and 48 hr. after dive 3. Blood oxidative stress samples were collected on dive days before diving, at 3 and 6 hr. during the dive, 30 and 60 min post-dive, and 16 and 48 hr after dive 3. Nerve conduction velocity (NCV) was performed before and after each dive. Aerobic performance decreased (p = .021) after dive 3 compared to baseline (6.4 1.8 min vs. 5.3 2.0 min, p = .037), but not at 48-hr post-dive 3. V.O2 (p = .001) and heart rate (HR) (p = .013) decreased during aerobic performance atpost-dive 3 (V.O2: p = .009, HR: p = .010) compared to baseline. V.O2 (p = .005) remained lower at 48-hr post-dive 3. No other metabolic or respiratory parameters changed. Systemic oxidative stress makers and NCV were unaffected. Aerobic performance is reduced after 6-hour 100 O2 dives on 3 consecutive days. Unfortunately, the measured variables do not fully explain performance decrements.



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