Reproducibility of indirect (CO 2 ) Fick method for calculation of cardiac output.

Zeidifard, E.; Silverman, Michael E.; Godfrey, Sheila

doi:10.1152/jappl.1972.33.1.141

Cited by 33 publications

(20 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…38 This combination has been found to give highly reproducible results (coecient of variation 5.7%) during submaximal exercise in healthy individuals. 20 The results are also in agreement with the results obtained by the direct Fick method 39 and the dye dilution method. 40 However, since only limited data is available for establishing the validity of indirect methods in able-bodied individuals, and no data is available in tetraplegic subjects, it is important to be aware of the assumptions and potential errors that may occur when using these techniques.…”

Section: Discussionsupporting

confidence: 86%

Improved work capacity but unchanged peak oxygen uptake during primary rehabilitation in tetraplegic patients

Hjeltnes

Wallberg-Henriksson

1998

Spinal Cord

View full text Add to dashboard Cite

Individuals with cervical spinal cord lesions are characterised by markedly decreased aerobic capacity, accompanied by increased risk of developing cardiovascular disease. The aim of this study was to evaluate the eects of a primary rehabilitation programme that included three sessions of arm cycling per week on the endurance capacity in 10 male tetraplegic subjects (injury level C6-C8; eight ASIA-A and two ASIA-B). Peak oxygen uptake (peak VO 2 ) was measured three times (at T1 & 99+10 days after injury, T2 & 2 months after T1, and at T3 & 2 months after T2). Ten paraplegic patients admitted to the hospital for primary rehabilitation served as controls. In the tetraplegic patients, mean peak load increased (22+2, 32+5, and 32+7 watt, at T1, T2 and T3 respectively) (P50.01), while mean peak VO 2 did not change during the study (0.78+0.07, 0.86+0.08, and 0.81+0.06 16min 71 , at T1, T2 and T3, respectively) (ns). In contrast peak VO 2 was signi®cantly higher in the paraplegic control group (1.37+0.08, 1.64+0.10 and 1.75+0.08 16min 71 , respectively) (P50.001), and increased signi®cantly during the study period (P50.001). Mean heart rate (HR) and mean stroke volume (SV), measured at corresponding submaximal work loads during the study did not change signi®cantly in the tetraplegic patients. Mean systolic blood pressure (SBP), recorded immediately after peak arm exercise was low at all three tests (93+8, 89+6 and 84+6 mmHg) in the tetraplegic group. However, both muscle strength and`activities of daily life' index improved signi®cantly during the study period. Our results suggest that functional improvement in tetraplegic patients is not necessarily followed by aerobic metabolic improvement. We conclude that more time should be spent on arm endurance training, or training methods which activate larger muscle groups and/or increases blood pressure.

show abstract

Section: Discussionsupporting

confidence: 86%

Improved work capacity but unchanged peak oxygen uptake during primary rehabilitation in tetraplegic patients

Hjeltnes

Wallberg-Henriksson

1998

Spinal Cord

View full text Add to dashboard Cite

show abstract

“…In ambulatory individuals tested either on the treadmill or leg cycle ergometer, coefficients of variation for cardiac output measured with the rebreathing technique have been reported to range between 5 and 10 percent [6,[15][16]19], although one study observed coefficients of variation of 0.8 and 1.4 percent for workloads of 50 and 100 W, respectively [16]. Thus, the coefficient of variation we observed (5.1%) is typical of the values observed for ambulatory individuals using the CO 2 rebreathing technique.…”

Section: Discussionmentioning

confidence: 99%

“…Most investigators have observed high day-to-day reproducibility of cardiac output measured by CO 2 rebreathing [13][14], and others have documented the procedure's validity by comparing it with cardiac output estimated from published regression lines relating to VO 2 [15][16]. However, few data are available on employing the CO 2 rebreathing technique in individuals with SCI, and to our knowledge no studies have assessed the reproducibility of this technique in an SCI population.…”

Section: Introductionmentioning

confidence: 99%

Reproducibility of noninvasive cardiac output during arm exercise in spinal cord injury

Myers

Brown²,

Smith³

et al. 2007

JRRD

View full text Add to dashboard Cite

Abstract-The carbon dioxide (CO 2 ) rebreathing method is a noninvasive technique to estimate cardiac output during exercise, but few data are available on the validity and reliability of this measure in individuals with spinal cord injury (SCI). Sixteen male subjects with SCI (mean age 45 +/− 9, seven paraplegic and nine tetraplegic) underwent three submaximal steady state arm ergometer exercise tests. We estimated cardiac output using the exponential CO 2 rebreathing technique at an individualized exercise intensity approximating 50% of peak oxygen uptake. Mean values for the cardiac output measurements were 13.0 +/− 2.4, 13.3 +/− 2.0, and 13.4 +/− 1.7 L/min; the difference among the trials was not significant (p = 0.54). The typical error was 1.80 +/− 0.85 L/min, the limits of agreement were 11.3 to 15.3 L/min, the coefficient of variation was 5.4% +/− 3.4%, and the intraclass correlation coefficient was 0.85 (95% confidence interval = 0.70-0.94). The test-to-test variation in estimated cardiac output during arm ergometry in individuals with SCI is similar to that observed in studies that used this technique in ambulatory persons. The 5% relative variation between tests suggests that the CO 2 rebreathing technique for estimating cardiac output can be performed in SCI individuals with acceptable reproducibility.

show abstract

“…The reliability, reproducibility and validity of this method have already been reported by many researchers (KLAUSEN, 1965;FERGUSON et at., 1968;MUIESAN et at., 1968;ZEIDIFARD et at., 1972;WoLFE et at., 1978). An advantage of this method is that it gives hardly any discomfort to the subjects.…”

Section: Discussionmentioning

confidence: 99%

“…With regard to circulatory functions while exercising, it is known that the ° maximal heart rate is higher (ASTRAND and RODAHL, 1970;YOSHIDA and ISHIKO, 1977) and the maximal stroke volume and the maximal cardiac output are lower (YOSHIDA and ISHIKO, 1977) in children than in adults. However, no agreement has been obtained as to whether cardiac output (Q) in children during submaximal exercise is equal to (GODFREY et al, 1971;ZEIDIFARD et at., 1972) or lower (BAR-OR et al, 1971;ERICKSSON et al, 1971;RODE and SHEPHARD, 1973;PATERSON and CUNNINGHAM, 1976) than that in adults at a given oxygen uptake (Vo2). Moreover, many of these studies used values of adults in the literature for a comparison, which in fact should represent a less strict comparison.…”

mentioning

confidence: 99%

Cardiac Output of 10- to 11-year-old Children during Exercise under Different Ambient Temperatures

Katsuura

1985

Journal of Anthropological Society of Nippon

View full text Add to dashboard Cite

Cardiac output (Q) was measured by the CO2 rebreathing method in 10 boys and 9 girls. They performed cycle ergometer exercises at 300 and 450kgm/min in ambient temperatures kept at 20, 30, and 40*. For a given oxygen uptake (Vo2), stroke volume (SV) tended to be reduced and heart rate (HR) increased in a 40 * environment in both sexes. Accordingly, Q at 40* was maintained at a level similar to that in cooler conditions. A lower HR and a higher SV at a given Vo2 were shown in boys than in girls. The regression equation of Q on Vo2 in boys was found to be similar to that in girls. The values of Q in relation to Vo2 in the children studied were compared with those in children and adults who had been previously studied. The children in the present study were found to have a Q response that represented roughly an average of those of children described in the literature cited, and to have a lower Q as compared with most adults.

show abstract

Reproducibility of indirect (CO 2 ) Fick method for calculation of cardiac output.

Cited by 33 publications

References 0 publications

Improved work capacity but unchanged peak oxygen uptake during primary rehabilitation in tetraplegic patients

Improved work capacity but unchanged peak oxygen uptake during primary rehabilitation in tetraplegic patients

Reproducibility of noninvasive cardiac output during arm exercise in spinal cord injury

Cardiac Output of 10- to 11-year-old Children during Exercise under Different Ambient Temperatures

Contact Info

Product

Resources

About