Lab 6 - VO2max

Name: Brady Spence Date: P409 Lab 6: VO 2 max Turn In: Lab #6 data sheets Points: Lab participation and data sheets 5 pts Lab assignment questions Lab assignment 20 pts Overview  Students will observe VO 2 max tests  Each of the two subjects will perform essentially the same testing protocol (1/2 wattage increases when close to max for males) o The subjects will have different training histories and fitness levels, so that we can compare VO 2 between them. o Calculate age-predicted maximal HR using Tanaka equation: HR = 208 - (0.7 * age) o Once RPE 15 is hit, subsequent stage times will be halved from 2 minutes to 1 minute (HR and RPE will be collected every minute instead of every 2 minutes) Subject Name: Zach Age: 21 Training History/Fitness Level: APMHR: 193.3 Secondary max criteria check-off (2 / 3 = max was likely hit): ≥95% APMHR _ 183.635 ___ RPE ≥18 ____ Pedal Rate < 50___ Stage Number Time Power (W) VO 2 (ml/kg/min) Heart rate (bpm) RPE RER Warm-Up 0:30 50 5.98 138 6 1.22 1:00 9.41 1.03 1 1:30 100 13.51 144 9 .78 2:00 19.42 .76 2:30 18.31 .84 3:00 22.61 .87 2 3:30 150 22.46 138 11 .92 4:00 24.69 .92 4:30 24.24 .94 5:00 29.78 .94 3 5:30 200 225 32.53 150 144 14 15 .99 6:00 35.96 .99 6:30 36.57 1.04 7:00 39.83 1.05 4 7:30 250 275 43.14 150 17 1.09 8:00 47.57 1.09 8:30 49.51 1.14 9:00 51.29 1.19 5 9:30 52.69 10:00 10:30 11:00 6 11:30 12:00 12:30 13:00 7 13:30

14:00 14:30 15:00 Subject Name: Domenica Age: 32 Training History/Fitness Level: APMHR: 185.6 Secondary max criteria check-off (2 / 3 = max was likely hit): ≥95% APMHR __ 176.32 __ RPE ≥18 ____ Pedal Rate < 50 ____ Stage Number Time Power (W) VO 2 (ml/kg/min) Heart rate (bpm) RPE RER Warm-Up 0:30 50 5.94 102 6 .83 1:00 19.4 .69 1 1:30 100 10.28 102 7 .71 2:00 15.41 .71 2:30 19.46 .79 3:00 24.16 .80 2 3:30 125 22.29 156 11 .87 4:00 25.03 .94 4:30 27.63 .96 5:00 29.40 .97 3 5:30 150 30.93 162 15 1.04 6:00 34.16 1.09 6:30 7:00 4 7:30 8:00 8:30 9:00 5 9:30 10:00 10:30 11:00 6 11:30 12:00 12:30 13:00 7 13:30 14:00 14:30 15:00

P409 Lab 6: VO 2 max NOTE: No handwritten answers for these questions or table entries. Everything must be typed. See the syllabus for the due date. All lab assignments will be turned in during a subsequent lab as noted on the syllabus. 1. How does each subject’s VO 2 max compare to that expected for someone their age and sex? (Below normal, about average, above normal) How many METS did they achieve? Zach’s VO2 max of 52.69 would put him into the excellent category based off of his age range of 20-29 which is the 93 rd percentile. Domenica’s VO2 max of 34.16 would put her into the good category based off the age range of 30-39, also placing her in the 57 th percentile. Zach’s maximum METS was 15.06 and Domenica’s maximum METS was 9.76. 2. For each subject, was peak RER over 1.0? 1.1? If so, where does the ‘extra’ CO 2 come from? In relation to this, at what percentage of VO 2 max does lactate threshold normally occur at untrained individuals? Where is the lactate coming from and how would lactate impact the ‘extra’ CO 2 ? Lactate production increases when the demand for ATP and oxygen exceeds supply. For untrained individuals lactate threshold occurs between 50-60% of VO2 max and for trained individuals it occurs around 70-80%. Zach’s peak RER was 1.26 and Domenica’s was 1.05. This means both of them were using anaerobic expiration and more carbon dioxide is produced than oxygen is consumed. Carbohydrates were being used during their peak RER. Sometimes lactate can release more CO2 as well. 3. Calculate each subject’s maximal cardiac output (in L/min) and stroke volume (in mL/beat) based on the cardiovascular Fick equation (using the APMHR you calculated for each subject). Assume that a-vO 2 diff = 16 vol%, or 16 mL of O 2 per 100 mL of blood. Show your work . Zach: 193 * 0.16 = 30.88 3800/30.88 = 123 mL/beat 0.123 * 193 = 24 Domenica: 185 * 0.16 = 29.6 2300/29.6 = 77 mL/beat 0.077 * 185 = 14 4. If the subject with the lower VO 2 max were able to increase their stroke volume by 20%, but their maximal heart rate and a-vO 2 diff were unchanged, how much would their VO 2 max increase? VO2 max = HRmax * SV max * a-VO2 diff From equation VO2 max is directly proportional to stroke volume (HR and a-vO2 difference are constant). If SV increases by 20% then VO2 max also increases by 20%

5. Describe the characteristics of the ideal VO 2 max test protocol (total duration, etc.). What is the purpose or intent of these design characteristics? A VO2 max test will be used to measure the amount of oxygen that is used during exercise. Ideally the test would last 8-12 minutes with increasing intensity over time and ideally be sport specific depending on the client being tested. 6. What are the advantages and disadvantages of using a standardized protocol (e.g., Bruce, Balke) versus a customized or individualized protocol to determine VO 2 max? Advantages Standardized = more accessible, comparable with large populations of individuals Disadvantages Standardized = not ideal for non-athletes could be overkill for some Advantages Customized = Sport specific, individualized, ability to design more effective training program for client, Disadvantages Customized = non comparable, higher cost, less accessible