Truemax 2400 metabolic cart

Manufactured by Parvo Medics

Sourced in United States

The TrueMax 2400 Metabolic Cart is a laboratory equipment designed to measure an individual's metabolic rate. It collects and analyzes respiratory gases to determine oxygen consumption and carbon dioxide production, which are key indicators of metabolism.

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Lab products found in correlation

Polar s810i, by Polar Electro (2 mentions) Two way breathing valve, by Hans Rudolph (1 mentions)

6 protocols using truemax 2400 metabolic cart

Maximal Cardiopulmonary Exercise Testing and Strength Measures

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All physical fitness measures were performed by trained study staff. Peak VO₂ was determined via maximal cardiopulmonary exercise tests with a 12-lead ECG and expired gas analysis on a treadmill using a TrueMax 2400 Metabolic Cart (ParvoMedics, Sandy, UT) before and after the exercise intervention, as described previously (Duscha et al., 2005 (link)). Exercise tests were performed under medical supervision and were conducted by exercise physiologists. The two highest, consecutive, 15 second readings from each test were averages to determine absolute peak VO₂ (L/min). In RT and AT/RT participants, the upper and lower body total amounts of weight lifted (TWL) from a single session during week 5 were used as the baseline measure of overall strength. The same measurements from a single session at week 32 were used as the end of training measure of overall strength. The difference in these two amounts constituted the overall strength gains expressed in pounds lifted/session. TWL was recorded each week either by a supervising exercise professional at East Carolina University site or electronically by the FitLinxx Strength Training Partner system (FitLinxx, Norwalk, CT) at the Duke University site.

Collins K.A., Fos L.B., Ross L.M., Slentz C.A., Davis P.G., Willis L.H., Piner L.W., Bateman L.A., Houmard J.A, & Kraus W.E. (2021). Aerobic, Resistance, and Combination Training on Health-Related Quality of Life: The STRRIDE-AT/RT Randomized Trial. Frontiers in Sports and Active Living, 2, 620300.

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Cardiopulmonary Exercise Test Protocol

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All subjects completed a cardiopulmonary graded exercise test on a treadmill with a 12-lead electrocardiograph and had expired gas measured using a TrueMax 2400 Metabolic Cart (ParvoMEdics; Sandy, UT). The test protocol included 2 minute stages with the workload increasing by one metabolic equivalent per stage. VO₂peak was determined by averaging the two consecutive highest 15 second readings. A respiratory exchange ratio ≥1.10 was the criteria used to terminate the test.

Moker E.A., Bateman L.A., Kraus W.E, & Pescatello L.S. (2014). The Relationship between the Blood Pressure Responses to Exercise following Training and Detraining Periods. PLoS ONE, 9(9), e105755.

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Cardiorespiratory Fitness Assessment Protocol

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Resting blood pressure was assessed with a Colin Jentow monitor (Model 7000; Colin Medical, Japan) for pre- and post-test systolic blood pressure (SBP) and diastolic blood pressure levels in the laboratory. On a separate day, cardiorespiratory fitness was assessed using a TrueMax 2400 Metabolic Cart (ParvoMedics Inc., USA), and heart rate (HR) was recorded during this session using a Polar S810I telemetry system (Polar, Finland). After a 3-minute warm-up at 30 watts (W) with a set pedal frequency of 60 revolutions per minute (RPM), the initial load was set at 45 W and was increased 15 W every minute until voluntary cessation and/or pedal frequency could not be maintained. All sessions were performed on an electronically braked Monark cycle ergometer, 839E (Monark, Sweden), using a two-way breathing valve and nose clip (Hans Rudolph, USA). Due to the strenuous nature of the exercise session, not all participants achieved the criteria for VO_2max,21 (link) so VO_2peak was accepted as an indicant of aerobic power.

Dunn S.L., Siu W., Freund J, & Boutcher S.H. (2014). The effect of a lifestyle intervention on metabolic health in young women. Diabetes, Metabolic Syndrome and Obesity: Targets and Therapy, 7, 437-444.

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Cardiopulmonary Exercise Testing Protocol

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O₂max test was performed on a Monark Ergomedic 839E ergometer (Monark, Vansbro, Sweden) with a closed respiratory gas exchange system usinga True Max 2400 Metabolic Cart (ParvoMedics Inc, USA). The test began with a 3-min warm-up at an initial load of 30 watts (W) and 60 revolutions per min (rpm).After the first 3 min, the power output was increased at a rate of 30W/min.The test was completed when the following criteria were fulfilled:( 1) inability to retain a pedaling cadence of 60pm, (2) plateauing in

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O2response despite increasing exertion, (3) respiratory exchange ratio (RER) ≥ 1.15, and (4) heart rate (HR) within 10 bpm of age-predicted maximum (220 - age)^{19 (link)}. Min-by-minmeasurements of HRand Borg’s rate of perceived exertion (RPE) were also recorded^{20 (link)}. HR was monitoredusing short range telemetry (Polar S810I, Polar Electro, Kempele, Finland).

Chu A., Boutcher Y.N, & Boutcher S.H. (2016). Effect of acute interval sprinting exercise on postprandial lipemia of sedentary young men. Journal of Exercise Nutrition & Biochemistry, 20(1), 9-14.

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Comprehensive Fitness Assessment Protocol

Cited 1 time

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All physical fitness and anthropometric measures were assessed by trained study staff and evaluated at baseline and following the 6 months of prescribed exercise training. Peak V̇O₂ was determined via maximal cardiopulmonary exercise tests with a 12-lead ECG and expired gas analysis on a treadmill using the TrueMax 2400 Metabolic Cart (ParvoMedics, Salt Lake City, Utah, USA) as previously described.22 (link) The two greatest, consecutive, 15-second readings within the final 90 s of the test were averaged to determine peak V̇O₂. Exercise tests were performed under medical supervision and were conducted by clinical exercise physiologists.
Height and body weight were assessed with the participant in light weight clothing without shoes. Height was assessed using a stadiometer (Seca-220, Hamburg, Germany) to the 0.1 cm, measured one time. Body weight was assessed using a calibrated digital scale to the nearest 0.1 kg, measured one time prior to a muscle biopsy visit. Waist circumference around the minimal waist (the lowest circumference measurement above the umbilicus and below the xiphoid) and hip circumference were measured to the nearest 0.1 cm. Body composition measures were assessed using the BOD POD air displacement plethysmography method (COSMED, Chicago, Illinois, USA).

Collins K.A., Ross L.M., Piner L.W., Fos L.B., Slentz C.A., Bateman L.A., Willis L.H., Bales C.W., Siegler I.C., Wolever R.Q., Huffman K.M, & Kraus W.E. (2022). Amount and intensity effects of exercise training alone versus a combined diet and exercise lifestyle intervention on health-related quality of life in the STRRIDE-PD randomized trial. BMJ Open Diabetes Research & Care, 10(1), e002584.

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Cardiorespiratory Fitness Measurement Protocol

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Cardiorespiratory fitness (VO₂peak) was assessed using a modified Bruce protocol (American College of Sports Medicine, 2018 ) on a motor-driven treadmill, which involved increasing the speed and grade of the treadmill every 2 min until volitional exhaustion was reached. A Polar HR monitor was used to record heart rate throughout the test. VO₂peak was calculated from direct expired gas exchange data using a computerized metabolic system (Parvo Medics True Max 2400 Metabolic Cart, ParvoMedics, Inc., Sandy, UT). VO₂peak was defined as the maximal rate of oxygen consumption per kilogram of body weight (mL*kg⁻¹*min⁻¹) when at least three of the following criteria were met: (a) a plateau in oxygen consumption corresponding to an increase of less than 150 ml in oxygen uptake despite a progressive increase in workload, (b) maximal heart rate within 10 beats per min (bpm) of age-predicted maximal values (220 bpm—age in years), (c) a respiratory exchange ratio greater than 1.10, or (d) a rating of perceived exertion greater than or equal to 17. Upon completion of the assessment, participants cooled down for 5 min at a self-selected pace at a 0% grade.

Brush C.J., Olson R.L., Ehmann P.J., Bocchine A.J., Bates M.E., Buckman J.F., Leyro T.M, & Alderman B.L. (2019). Lower resting cardiac autonomic balance in young adults with current major depression. Psychophysiology, 56(8), e13385.

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