Validation of Aerosport Kb1-C Portable Metabolic System

King, George A.; McLaughlin, James E.; Howley, Edward T.; Bassett, David R.; Ainsworth, Barbara

doi:10.1097/00005768-199905001-01406

Cited by 22 publications

(34 citation statements)

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“…The mean error of the equipment is relatively small (6%) and the Aerosport Kb1C is acceptable for measuring oxygen uptake in the range of 1.5 to 3.5 L/min, which was the interval used in the present study. The medium-flow pneumotach setting (flow-rate range of 10-120 L/min) was used to decrease the error in the volume measurement (21).…”

Section: Analytical Proceduresmentioning

confidence: 99%

Effect of carbohydrate availability on time to exhaustion in exercise performed at two different intensities

Lima‐Silva

De-Oliveira

Nakamura

et al. 2009

Braz J Med Biol Res

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This study examined the effects of pre-exercise carbohydrate availability on the time to exhaustion for moderate and heavy exercise. Seven men participated in a randomized order in two diet and exercise regimens each lasting 3 days with a 1-week interval for washout. The tests were performed at 50% of the difference between the first (LT 1 ) and second (LT 2 ) lactate breakpoint for moderate exercise (below LT 2 ) and at 25% of the difference between the maximal load and LT 2 for heavy exercise (above LT 2 ) until exhaustion. Forty-eight hours before each experimental session, subjects performed a 90-min cycling exercise followed by 5-min rest periods and a subsequent 1-min cycling bout at 125% VO 2max /1-min rest periods until exhaustion to deplete muscle glycogen. A diet providing 10% (CHO low ) or 65% (CHO mod ) energy as carbohydrates was consumed for 2 days until the day of the experimental test. In the exercise below LT 2 , time to exhaustion did not differ between the CHO mod and the CHO low diets (57.22 ± 24.24 vs 57.16 ± 25.24 min). In the exercise above LT 2 , time to exhaustion decreased significantly from 23.16 ± 8.76 min on the CHO mod diet to 18.30 ± 5.86 min on the CHO low diet (P < 0.05). The rate of carbohydrate oxidation, respiratory exchange ratio and blood lactate concentration were reduced for CHO low only during exercise above LT 2 . These results suggest that muscle glycogen depletion followed by a period of a low carbohydrate diet impairs high-intensity exercise performance.

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Section: Analytical Proceduresmentioning

confidence: 99%

Effect of carbohydrate availability on time to exhaustion in exercise performed at two different intensities

Lima‐Silva

De-Oliveira

Nakamura

et al. 2009

Braz J Med Biol Res

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“…errors at rest and during exercise had a 95% LOA of -70 to 140 ml/min and -50 to 590 ml/min, respectively; and King et al 16) reported that the individual V ・ E and V ・ O2 errors for the Aerosport KB1-C (Aeroport, Michigan, USA) had a 95% LOA of approximately -500 to 450 ml/min between rest and 250 W. Metabolic measurement systems equipped with a ventilation meter have been reported in some studies to underestimate or overestimate ventilation. Ventilation meters with turbine and pneumotachometry expression are used in many systems.…”

Section: Discussionmentioning

confidence: 95%

Simultaneous multiple-subject analysis of respiratory gas exchange in humans

Hirano¹,

Yamada²,

Hibi³

et al. 2014

JPFSM

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Respiratory gas collection and analysis with indirect calorimetry allows assessment of energy and substrate use during rest and exercise and aerobic capacity. We have developed a novel system for simultaneous multiple-subject measurement of respiratory gas exchange during rest and exercise for up to five subjects, and validated the system with a series of experiments. Thirteen healthy young men (mean age 22 ± 2 years, height 172 ± 6 cm, weight 67.1 ± 11.6 kg) participated in this study. Memory problems of the mass spectrometer, which are caused by switching analyzed gases of different compositions between channels, was sufficiently eliminated with a washout of 2 s (seconds) with errors of less than 0.3% for O 2 and less than 0.4% for CO 2 . The high-response mass spectrometer and specially designed mixing chamber enabled correct estimation of metabolic measurements, even for gas concentration data from a non-continuous flow of any given 1s of every 10-s interval (spot-sampling method). Diet-induced thermogenesis (DIT) and oxygen consumption (V ・ O 2 ) during maximal incremental exercise were not significantly different between the novel and Douglas bag methods (P = 0.61 and P = 0.56, respectively). The limit of agreement of DIT and V ・ O 2 during maximal incremental exercise between the two methods were 2.8 ± 43.6% and 0.9 ± 4.8%, respectively. We concluded that the newly developed system has reasonable validity over a wide range.

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“…The KB1-C has also been validated against a criterion Douglas bag system during cycle ergometry [13]. In this latter study, the validity of the system was acceptable for measuring O 2 uptake in the 1.5 to 3.5 L/min range [13].…”

Section: Instrumentationmentioning

confidence: 90%

Reliability of measures of gait performance and oxygen consumption with stroke survivors

Cunha-Filho¹,

Henson²,

Wankadia³

et al. 2003

JRRD

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Abstract-This study assessed the reliability of gait performance with concurrent measures of oxygen consumption (VO 2 ) in stroke survivors (SS). Nine male SS (60.00 ± 15.08 yr) had a recent history of stroke (44.56 ± 51.35 days since the stroke) and were receiving rehabilitation. Four had a right cerebrovascular accident (CVA), and five had a left CVA. Subjects walked without assistance, although three used a single cane to complete the test. Within 30 minutes, subjects completed two trials of a 5 min walk while walking back and forth on a 5 m walkway wearing a portable gas analyzer to collect samples of gases. The intraclass correlation coefficient (ICC) was used to assess reliability. The ICC for gait energy expenditure, walk distance, gait speed, and gait energy cost were 0.64, 0.97, 0.95, and 0.97, respectively. Assessment of gait performance with concurrent measures of VO 2 is a reliable procedure with SS.

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Validation of Aerosport Kb1-C Portable Metabolic System

Cited by 22 publications

References 0 publications

Effect of carbohydrate availability on time to exhaustion in exercise performed at two different intensities

Effect of carbohydrate availability on time to exhaustion in exercise performed at two different intensities

Simultaneous multiple-subject analysis of respiratory gas exchange in humans

Reliability of measures of gait performance and oxygen consumption with stroke survivors

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