Πέμπτη 18 Μαΐου 2017

Effect of Cyclooxygenase Inhibition on the Inspiratory Muscle Metaboreflex-Induced Cardiovascular Consequences in Men

Inspiratory muscle metaboreflex activation increases mean arterial pressure (MAP) and limb vascular resistance (LVR) and decreases limb blood flow (QL). Cyclooxygenase (COX) inhibition has been found to attenuate limb skeletal muscle metaboreflex-induced increases in muscle sympathetic nerve activity. We hypothesized that compared to placebo (PLA), COX inhibition would attenuate inspiratory muscle metaboreflex-induced 1) increases in MAP and LVR and 2) decreases in QL. Seven men (22±1 years) were recruited and orally consumed ibuprofen (IB, 10mg/kg) or PLA 90 min prior to performing the cold pressor test (CPT) for 2 min and inspiratory resistive breathing task (IRBT) for 14.9±2.0min at 65% of maximal inspiratory pressure. Breathing frequency was 20 breaths per min with a 50% duty cycle during the IRBTs. MAP was measured via automated oscillometry, QL was determined via Doppler ultrasound, and LVR was calculated as MAP divided by QL. EMG was recorded on the leg to ensure no muscle contraction occurred. The 65% IRBT led to greater increases (p=0.02) in 6-keto-PGF with PLA compared to IB. IB, compared to PLA, led to greater (p<0.01) increases in MAP (IB: 17±7mmHg vs. PLA: 8±5mmHg) and LVR (IB: 69±28% vs. PLA: 52±22%) at the final min of the 65% IRBT. The decrease in QL was not different (p=0.72) between IB (-28±11%) and PLA (-27±9%) at the final min. The increase in MAP during the CPT was not different (p=0.87) between IB (25±11mmHg) and PLA (24±6mmHg). Contrary to our hypotheses, COX inhibition led to greater inspiratory muscle metaboreflex-induced increases in MAP and LVR.



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