* The impact of consecutive freshwater trimix dives at altitude on human cardiovascular function.
- Self-contained underwater breathing apparatus (SCUBA) diving is regularly associated with numerous asymptomatic changes in cardiovascular function. Freshwater SCUBA diving presents unique challenges compared with open sea diving related to differences in water density and the potential for dive locations at altitude. The aim of this study was to evaluate the impact of freshwater trimix diving at altitude on human cardiovascular function. Ten divers performed two dives in consecutive days at 294 m altitude with the surface interval of 24 h. Both dives were at a depth of 45 m with total dive time 29 and 26 min for the first and second dive, respectively. Assessment of venous gas embolization, hydration status, cardiac function and arterial stiffness was performed. Production of venous gas emboli was low, and there were no significant differences between the dives. After the first dive, diastolic blood pressure was significantly reduced, which persisted up to 24 h. Left ventricular stroke volume decreased, and heart rate increased after both dives. Pulse wave velocity was unchanged following the dives. However, the central and peripheral augmentation index became more negative after both dives, indicating reduced wave reflection. Ejection duration and round trip travel time were prolonged 24 h after the first dive, suggesting longer-lasting suppression of cardiac and endothelial function. This study shows that freshwater trimix dives with conservative profiles and low venous gas bubble loads can result in multiple asymptomatic acute cardiovascular changes some of which were present up to 24 h after dive.
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Overview of verb reduce
The verb reduce has 20 senses (first 11 from tagged texts)
1. (102) reduce, cut down, cut back, trim, trim down, trim back, cut, bring down -- (cut down on;
make a reduction in; "reduce your daily fat intake"; "The employer wants to cut back health
benefits")
2. (9) reduce -- (make less complex; "reduce a problem to a single question")
3. (5) reduce -- (bring to humbler or weaker state or condition; "He reduced the population to
slavery")
4. (3) reduce -- (simplify the form of a mathematical equation of expression by substituting one
term for another)
5. (3) reduce -- (lower in grade or rank or force somebody into an undignified situation; "She
reduced her niece to a servant")
6. (3) reduce, come down, boil down -- (be the essential element; "The proposal boils down to a
compromise")
7. (2) shrink, reduce -- (reduce in size; reduce physically; "Hot water will shrink the sweater";
"Can you shrink this image?")
8. (1) reduce -- (lessen and make more modest; "reduce one's standard of living")
9. (1) reduce, scale down -- (make smaller; "reduce an image")
10. (1) deoxidize, deoxidise, reduce -- (to remove oxygen from a compound, or cause to react with
hydrogen or form a hydride, or to undergo an increase in the number of electrons)
11. (1) reduce, tighten -- (narrow or limit; "reduce the influx of foreigners")
12. repress, quash, keep down, subdue, subjugate, reduce -- (put down by force or intimidation; "The
government quashes any attempt of an uprising"; "China keeps down her dissidents very efficiently";
"The rich landowners subjugated the peasants working the land")
13. reduce -- (undergo meiosis; "The cells reduce")
14. reduce -- (reposition (a broken bone after surgery) back to its normal site)
15. reduce -- (destress and thus weaken a sound when pronouncing it)
16. abridge, foreshorten, abbreviate, shorten, cut, contract, reduce -- (reduce in scope while
retaining essential elements; "The manuscript must be shortened")
17. boil down, reduce, decoct, concentrate -- (be cooked until very little liquid is left; "The
sauce should reduce to one cup")
18. reduce, boil down, concentrate -- (cook until very little liquid is left; "The cook reduced the
sauce by boiling it for a long time")
19. dilute, thin, thin out, reduce, cut -- (lessen the strength or flavor of a solution or mixture;
"cut bourbon")
20. reduce, melt off, lose weight, slim, slenderize, thin, slim down -- (take off weight)
Overview of adj reduced
The adj reduced has 2 senses (first 2 from tagged texts)
1. (6) decreased, reduced -- (made less in size or amount or degree)
2. (1) reduced, rock-bottom -- (well below normal (especially in price))
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