Supramaximal exercise after training-induced hypervolemia. I. Gas exchange and acid-base balance

1987 ◽  
Vol 62 (5) ◽  
pp. 1944-1953 ◽  
Author(s):  
H. J. Green ◽  
R. L. Hughson ◽  
J. A. Thomson ◽  
M. T. Sharratt
Keyword(s):  
Gas Exchange ◽  
Carrying Capacity ◽  
Minute Ventilation ◽  
Hemoglobin Concentration ◽  
O2 Consumption ◽  
Supramaximal Exercise ◽  
Acid Base Balance ◽  
Acid Base ◽  
Base Balance ◽  
Exercise Induced

The effect of an exercise-induced reduction in blood O2-carrying capacity on ventilatory gas exchange and acid-base balance during supramaximal exercise was studied in six males [peak O2 consumption (VO2peak), 3.98 +/- 0.49 l/min]. Three consecutive days of supramaximal exercise resulted in a preexercise reduction of hemoglobin concentration from 15.8 to 14.0 g/dl (P less than 0.05). During exercise (120% VO2peak) performed intermittently (1 min work to 4 min rest); a small but significant (P less than 0.05) increase was found for both O2 consumption (VO2) (l X min) and heart rate (beats/min) on day 2 of the training. On day 3, VO2 (l/min) was reduced 3.2% (P less than 0.05) over day 1 values. No changes were found in CO2 output and minute ventilation during exercise between training days. Similarly, short-term training failed to significantly alter the changes in arterialized blood PCO2, pH, and [HCO-3] observed during exercise. It is concluded that hypervolemia-induced reductions in O2-carrying capacity in the order of 10–11% cause minimal impairment to gas exchange and acid-base balance during supramaximal non-steady-state exercise.

scholarly journals Ion Regulation, Acid/Base Balance and Gas Exchange Interactions in Salmon Across Salinities

2019 ◽  
Vol 33 (S1) ◽  
Author(s):  
Christian Damsgaard ◽  
Monica McGrath ◽  
Chris M. Wood ◽  
Jeffrey G. Richards ◽  
Colin J. Brauner
Keyword(s):  
Gas Exchange ◽  
Exchange Interactions ◽  
Acid Base Balance ◽  
Acid Base ◽  
Ion Regulation ◽  
Base Balance

Effects of Gas Exchange on Acid-Base Balance

2012 ◽  
Author(s):  
Michael I. Lindinger ◽  
George J.F. Heigenhauser
Keyword(s):  
Gas Exchange ◽  
Acid Base Balance ◽  
Acid Base ◽  
Base Balance

Arterial Blood Gases, Acid-Base Balance, and Lactate and Gas Exchange Variables During Hypoxic Exercise

1989 ◽  
Vol 10 (04) ◽  
pp. 279-285 ◽  
Author(s):  
T. Yoshida ◽  
M. Udo ◽  
M. Chida ◽  
K. Makiguchi ◽  
M. Ichioka ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Blood Gases ◽  
Arterial Blood Gases ◽  
Acid Base Balance ◽  
Acid Base ◽  
Arterial Blood ◽  
Base Balance ◽  
Hypoxic Exercise

scholarly journals Photobiomodulation 30 min or 6 h Prior to Cycling Does Not Alter Resting Blood Flow Velocity, Exercise-Induced Physiological Responses or Time to Exhaustion in Healthy Men

2021 ◽  
Vol 11 ◽  
Author(s):  
Yago Medeiros Dutra ◽  
Gabriel Machado Claus ◽  
Elvis de Souza Malta ◽  
Daniela Moraes de Franco Seda ◽  
Anderson Saranz Zago ◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Femoral Artery ◽  
Blood Flow Velocity ◽  
Time To Exhaustion ◽  
Acid Base Balance ◽  
Acid Base ◽  
Base Balance ◽  
Exercise Induced ◽  
Plasma Nitrite

PurposeThe aim of the current study was to investigate the effects of photobiomodulation therapy (PBMT) applied 30 min or 6 h prior to cycling on blood flow velocity and plasma nitrite concentrations at rest, time to exhaustion, cardiorespiratory responses, blood acid-base balance, and K+ and lactate concentrations during exercise.MethodsIn a randomized, crossover design, 13 healthy untrained men randomly completed four cycling bouts until exhaustion at the severe-intensity domain (i.e., above respiratory compensation point). Thirty minutes or 6 h prior to the cycling trials, participants were treated with PBMT on the quadriceps, hamstrings, and gastrocnemius muscles of both limbs using a multi-diode array (11 cm × 30 cm with 264 diodes) at doses of 152 J or a sham irradiation (with device turned off, placebo). Blood samples were collected before and 30 min or 6 h after treatments to measure plasmatic nitrite concentrations. Doppler ultrasound exams of the femoral artery were also performed at the same time points. Cardiorespiratory responses, blood acid-base balance, and K+ and lactate concentrations were monitored during exercise sessions.ResultsPBMT did not improve the time to exhaustion (p = 0.30). At rest, no differences were found in the peak systolic velocity (p = 0.97) or pulsatility index (p = 0.83) in the femoral artery, and in plasma nitrite concentrations (p = 0.47). During exercise, there were no differences for any cardiorespiratory response monitored (heart rate, p = 0.15; oxygen uptake, p = 0.15; pulmonary ventilation, p = 0.67; carbon dioxide output, p = 0.93; and respiratory exchange ratio, p = 0.32), any blood acid-base balance indicator (pH, p = 0.74; base excess, p = 0.33; bicarbonate concentration, p = 0.54), or K+ (p = 0.22) and lactate (p = 0.55) concentrations.ConclusionsPBMT at 152 J applied 30 min or 6 h before cycling at severe-intensity did not alter resting plasma nitrite and blood flow velocity in the femoral artery, exercise-induced physiological responses, or time to exhaustion in healthy untrained men.

Interactions between cutaneous ion-exchange mechanisms and acid–base balance in amphibians

1989 ◽  
Vol 67 (12) ◽  
pp. 3070-3077 ◽  
Author(s):  
Daniel F. Stiffler
Keyword(s):  
Ion Exchange ◽  
Ion Transport ◽  
Extracellular Fluid ◽  
Ambystoma Tigrinum ◽  
Acid Base Balance ◽  
Acid Base ◽  
Homeostatic Process ◽  
Base Balance ◽  
Net Flux ◽  
Exercise Induced

It has been suspected for over 50 years that amphibian ion exchange involves independent transport of Na+ and Cl− in an inward direction across the skin in exchange for acidic cations and basic anions, respectively. Although a role for such exchange mechanisms has obvious utility in acid–base balance, their participation in this homeostatic process has only recently been documented. We now know that in aquatic Ambystoma tigrinum, the presence of NaCl in the water bathing the skin is required for acid–base regulatory responses to hypercapnia and exercise-induced lactacidosis. Acidotic and alkalotic conditions in the animals' extracellular fluid cause changes in both Na+ and Cl− influx and net flux which are consistent with a role for ion transport in acid–base balance. These processes appear to be under the control of both catecholamines and interrenal steroids.

ADJUSTMENT OF VENTILATION, INTRAPULMONARY GAS EXCHANGE, AND ACID-BASE BALANCE DURING THE FIRST DAY OF LIFE

PEDIATRICS ◽  
1964 ◽  
Vol 33 (5) ◽  
pp. 682-693
Author(s):  
L. Samuel Prod'hom ◽  
Henry Levison ◽  
Ruth B. Cherry ◽  
James E. Drorbaugh ◽  
John P. Hubbell ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Respiratory Distress ◽  
Respiratory Acidosis ◽  
Acid Base Balance ◽  
Acid Base ◽  
Infants Of Diabetic Mothers ◽  
Arterial Blood ◽  
Physiologic Dead Space ◽  
Base Balance ◽  
Diabetic Mothers

Determinations of blood gases and of acid-base balance were done in umbilical vein and artery blood at birth and in arterial blood at the age of 20 minutes in 20 infants of diabetic mothers. All were born by cesarean section, 18 of them between 36 and 37 weeks gestation. None showed respiratory distress at any time. Ventilation, gaseous metabolism, functional residual capacity, intrapulmonary gas exchange, and acid-base balance were determined at the age of 1, 4, and 24 hours in these 20 infants. The results indicate the following conclusions with regard to infants of diabetic mothers. 1. Adjustment of ventilation to perfusion in the lung appears to be complete at 4 hours of life. 2. Throughout the first 24 hours there is a persistence of an over-all true right to left shunt of approximately 20-25% of the total cardiac output. The exact localization of this shunt is unknown. 3. Acid-base balance in cord blood and in arterial blood during the first day of life in infants of diabetic mothers differs only slightly from that of infants of nondiabetic mothers. At 1 and 4 hours of age there is some persistence of a slight respiratory acidosis. 4. At 24 hours infants of diabetic mothers have the usual low arterial Pco2 of other newborn infants, but a ventilation equivalent of 16.5, which is normal for adults. 5. Although 6 of the 17 infants studied at 4 hours have shown a respiratory rate above 60 without other signs of respiratory distress, these infants with high rates had small tidal volumes, high physiologic dead-space/tidal volume ratios, and relatively little increase in minute volume.

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