Health Screening and Analysis

Case Study II: Health Screening and Analysis and Interpretation of GXT Data

John is a 35-year-old archeologist whose job requires some walking and hiking when he is collecting data in the field. However, much of his time is spent analyzing artifacts in the laboratory and writing research reports in his office. He is thinking about joining the employee fitness program at work, and therefore contacted you to evaluate his health risk and aerobic fitness level. His last medical examination was 3 months ago. You gave him a GXT using a Bodyguard cycle ergometer and collected the following data:

Client: 35-year-old male Resting BP: 131/92 mmHg
Resting HR: 71 bpm Total cholesterol: 210 mg · dl-1
Height: 5 ft 10 in. (177.8 cm) HDL-cholesterol: 30 mg · dl-1
Body weight: 175 lb (79.5 kg) Smoking history: 1 pack per day
Activity interests: cycling Physical activity: job-related walking/hiking

GXT Data

Stage Min Work rate (kgm · min-1) HR BP RPE
1 1 180 110    
  2 180 115    
  3 180 119 168/92 7
2 4 360 130    
  5 360 136    
  6 360 138 180/90 13
3 7 540 151    
  8 540 158    
  9 540 163 215/88 16



1. Based on demographic data, list this client’s complete CHD risk profile (e.g. HR – normal). Did a physician need to be present during the GXT (yes/no), given his CHD risk classification?


2. Identify any abnormalities, if any, in the HR and BP responses during the GXT.



3. Why was this GXT terminated at stage 3?


4. Calculate the energy cost of each workload for ALL three stages using the ACSM leg ergometry formula from Table 4.3: [(W/M) x 1.8] + 3.5 + 3.5. Convert ml · kg-1 · min-1 to METs for each stage by dividing the answer in each stage by 3.5. {SHOW WORK}


5. Plot the client’s HR versus workload (in METs) [You may use graph paper or Excel]. Draw a graph (either by hand or using Excel) using the HRs provided plotted against the METs you calculated in #4. For example , if your MET calculation for Stage 1 was 2 METs, then the first point on your graph would be (2, 119) where “2” is the METs and “119” is the corresponding HR. {SHOW WORK}


6. What is the client’s VO2max (in METs and ml/kg/min) using the graphing methodUse the graph that you drew in #5 and draw a “best fit” line through the points. Next draw a horizontal line across the graph that corresponds to the estimated HRmax (220 – age). Lastly, draw a vertical line down from where your best fit line intersects your HRmax line all the way down to the x-axis to determine VO2 max in METs. Multiply your answer by 3.5 to determine ml/kg/min. Hint: Your graph should resemble figure 4.10 in your textbook if you are doing it correctly. {SHOW WORK}

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