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GXT s cycle ergometer workload computation

Submaximal CRF Tests. Sub-maximal tests are similar to max GXT's, but thesubject does not have to go to maximal exercise.. Maximal GXT's are used to predict ischemic heartdisease, and to get a TRUE measure of VO2 max.Submaximal tests are used in most fitness settings.Maximal exercise testing is

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GXT s cycle ergometer workload computation

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    1. GXT’s – cycle ergometer workload computation

    2. Submaximal CRF Tests

    3. Submaximal CRF Tests

    4. Submaximal CRF Tests

    5. Submaximal CRF Predictions The HR max has been shown to vary as much as ? 11 bpm. The equation 220 – age, gives a low estimate. The equation 210 – (0.5 x age), gives a high estimate.

    6. Steps to administering Submaximal YMCA cycle ergometer test

    7. Steps to administering Submaximal YMCA cycle ergometer test

    8. Steps to administering Submaximal YMCA cycle ergometer test

    9. Submaximal CRF Calculations A graphical plot of HR responses to a GXT on a treadmill, cycle, or bench step can be used to estimate VO2 max. A line is drawn through HR values and is extrapolated to predicted max HR.

    10. Calculating VO2 max See Figure 11.3 for graphing procedures Determine the slope (b) by calculating the ratio of the difference between the two submaximal (SM) work loads (expressed as VO2) and the corresponding change in submaximal heart rates: b= (SM2 – SM1)/(HR2 - HR1) Calculate the VO2 for each work load using the ACSM metabolic equations (pp. 132-140). SM2=450kgm * 2 + (3.5 * 54.8 kg) = 1091.8 SM1 = 300 *2 + 3.5 * 54.8 = 791.8 b= (1091.8 – 791.8)/(126-115) = 27.27SM2=450kgm * 2 + (3.5 * 54.8 kg) = 1091.8 SM1 = 300 *2 + 3.5 * 54.8 = 791.8 b= (1091.8 – 791.8)/(126-115) = 27.27

    11. Submaximal Exercise Tests Use the submaximal work load (expressed as VO2) as calculated to predict max VO2: VO2 max = SM2 + b (HR max - HR2) Example calculation Used data from student YMCA: Heather, age 26, workload 1, 50 watts, 115 bpm, Workload 2, 75 watts, 126 bpm. VO2 turns out to be 53.76 ml/kg/minUsed data from student YMCA: Heather, age 26, workload 1, 50 watts, 115 bpm, Workload 2, 75 watts, 126 bpm. VO2 turns out to be 53.76 ml/kg/min

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