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Seven normal male subjects performed 5-min bicycle exercise ranging from 50-100 percent maximum oxygen uptake at 4 ATA and three were also studied at 6 ATA. At all pressures, the subjects breathed 0.2...
Effects of head-out water immersion on cardiorespiratory responses to maximal cycling exercise
human head-out immersion scuba breathing exercise cardiorespiratory
2009/7/20
Our objectives were to determine effects of head-out immersion (HOI), scuba breathing, and water temperature on cardiorespiratory responses to maximal aerobic work. Measurements of VO2, VE, and heart ...
Effects of immersion and static lung loading on submerged exercise at depth
CO2 carbon dioxide human exercise immersion
2009/7/17
The effects of static lung loading in the range +20 cmH2O to -20 cmH2O was investigated in 3 male subjects breathing air during submerged exercise in the prone position at pressures ranging from 1.45 ...
Alveolar Pco2 during rest and exercise in divers and non-divers breathing O2 at 1 ATA
human divers CO2 hypercapnia
2009/7/17
The extent of hypercapnia in oxygen-breathing subjects was investigated during rest and exercise (650 kpm/min). Divers, ex-divers, and non-divers were studied. Carbon dioxide retention was judged by e...
Effectiveness of a breath during exercise in a hyperbaric environment
human exercise ventilation
2009/7/16
During vigorous foot-pedal exercise at 6.75 ATA, three subjects had lower total ventilation, larger functional residual capacity (FRC), and higher PCO2 in end-expired and mixed-expired gas than during...
Influence of exercise on maximal voluntary ventilation and forced expiratory flow at depth
CO2 carbon dioxide human
2009/7/15
Four to six subjects performed maximal voluntary ventilation (MVV) and forced expirations during rest, exercise (50, 125, and 200 W), and inhalation of air and CO2 and air at rest while submerged at p...
Body cooling in human males by cold-water immersion after vigorous exercise
human cold-water immersion vigorous exercise
2009/7/15
Five male subjects were immersed to neck level in a whole-body water calorimeter (water temperature 19 degrees C) on two occasions. One immersion was preceded by 30 min of exercise on a treadmill at 8...
Steady-state body insulation was measured in 7 healthy male subjects during rest and exercise for 3 h in water of 28 degrees C - 32 degrees C. At rest, maximal body insulation increased as a linear fu...
Mental performance during submaximal exercise in 13 and 17% oxygen
exercise hypobaric chamber performance cognitive Psychomotor
2009/7/9
Submarine crews live in atmospheres containing variable levels of O2 and CO2. Under these conditions, significant reduction of the O2 may impair mental function during physical exertion. Therefore, ps...
Characteristics of the response to exercise in professional saturation divers
saturation CO2 carbon dioxide exercise pulmonary screening
2009/7/8
Exercise testing with measurements of expired minute ventilation (VE), oxygen uptake (VO2), and carbon dioxide elimination (VCO2) was done in 63 professional saturation divers, in the screening progra...
Static lung load and posture effects on pulmonary mechanics and comfort in underwater exercise
exercise pulmonary work of breathing position immersion
2009/7/8
Static lung load (SLL), or transrespiratory pressure gradient, imposed by underwater breathing apparatus can affect breathing comfort and mechanics, especially during exertion. We examined the effects...
Exercise effects on central venous nitrogen tensions after simulated non-decompression dives
saturation exercise air dive
2009/6/12
In five subjects we examined the effect of exercise on the pattern of central venous (right atrial) N2 tensions (PVN2) after ascent from simulated non-decompression dives. The dives consisted of expos...
Exercise conditioning reduces the risk of neurologic decompression illness in swine
exercise decompression animal pig model dry air Exercise conditioning Physical Conditioning
2009/6/12
During development of a pig model of neurologic decompression illness (DCI) we noted that treadmill-trained pigs seemed less likely to develop DCI than sedentary pigs. The phenomenon was formally inve...
CO2 retention during hyperbaric exercise while breathing 40/60 nitrox
exercise CO2 carbon dioxide air nitrox
2009/6/9
We evaluated CO2 retention in 24 Navy construction divers breathing air at 1 atm abs (101.3 kPa) and 40% O2 (40/60) nitrox at 4 atm abs (Po2 of 162.1 kPa) inside a pressure chamber. The divers sat imm...
Ascent rate, post-dive exercise, and decompression sickness in the rat
decompression exercise Ascent rate animal rat
2009/6/9
The effects of ascent rate and post-dive exercise on the incidence of decompression sickness (DCS) were investigated in six groups of 20 rats exposed for 2 h at a pressure equivalent to 240 feet of se...