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Printing:This poster is 48โ wide by 36โ high. Itโs designed to be printed on a large
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The Physics of Human Performance: An IDEAL LabW. Blake Laing (Physics), Harold Meyer (P.E., Health, and Wellness), Southern Adventist University
ABSTRACTPhysics lab goes to the gymnasium, where students calculate the mechanical power required to walk on an inclined treadmill in watts and convert to units power used to measure human performance: ๐๐2, and METs. Students learn how to use two linear regression models: the ACSM "walking equation" to estimate the actual power expenditure of walking and the
Rockport 1 mile test to estimate their own ๐๐2 ๐๐๐ฅ. Students
use models to prescribe exercise parameters for themselves and for two cases. The IDEAL lab collaboration is developing labs that are open, applied to life, and rigorously quantitative.
MAYBE I WILL USE THIS AGAIN!
Quantitative athletic training leads to measurable benefits
โข Calculate target HR for optimal aerobic training
โข Measure and monitor maximum aerobic power ๐๐2 ๐๐๐ฅ
Immeasurable benefits of physical comprehension
โข Use an incline: why run when you can walk?
โข Become a discerning user of fitness apps/devices
๐๐2 IS A MEASUREMENT OF POWERโข Aerobic metabolism of glucose:
โข Oxygen + glucose โ carbon dioxide + water + โenergyโ
โข 6๐2 + ๐ถ6๐ป12๐6 โ 6๐ถ๐2 + 6๐ป2๐ + ๐ด๐๐
โข Directly measure aerobic energy production from consumed ๐2
โข Work measured by volume of oxygen consumed ๐๐2 (mL)
โข Power measured by rate ๐๐2 (mL/min) or ๐๐2๐๐ฟ
๐๐๐/๐๐
BACKGROUND: LINEAR RESPONSE
โข From the American College of Sports Medicine (ACSM) Metabolic Calculations Handbook
3. RELATE HR TO UNITS OF POWER
IDEAL LAB PROJECTI Didnโt Expect Applications to Life! (IDEAL)
โข Life-science and personal health applications
โข Use of simple statistics to form quantitative conclusions
โข www.southern.edu/physicslab
CARDIOVASCULAR TRAINING UNITSโข Forget about work: pay attention to power!
โข Heart rate (HR) linearly related to power.
Field Energy/Work Power
Physics Joule, calorie 1 ๐ค๐๐ก๐ก = 1 ๐ฝ/๐
Nutrition 1 Calorie=1 kcal Kcal/time
Physiology ATP or ๐๐2 (mL ๐2) ๐๐2 (mL ๐2/min)
Clinical practice 1 MET=3.5 mL ๐2/min/kg 1. Walk on a treadmill with at least 10% grade and record HR
2. Calculate (sub-maximal) power expense
1. Use โwalking equationโ to estimate ๐O2
2. Use HR to estimate ๐O2 from linear response (Eq. 1)
3. Use speed and grade to calculate ๐O2 from โwalking equationโ (Eq. 2)
3. Relate personal HR to ๐O2, METS, and watts
1. CALCULATE PERSONAL ๐๐2 ๐๐๐ฅ
Quantify your current cardiovascular performance
1. Walk 1 mile. Record time and final HR.
2. Estimate personal peak power ๐O2 ๐๐๐ฅfrom
linear regression (time, HR, age, sex, weight)
3. Compare ๐O2 ๐๐๐ฅto tabulated data to
determine cardiovascular fitness
NO NEED FOR ๐O2 EQUIPMENT!
2. OPTIMIZE YOUR CARDIO WORKOUTS
How do you know youโre getting the most cardiovascular benefit?
1. Determine training intensity percentage from above table
2. Calculate target heart rate (THR) using Karvonen formula๐๐ป๐ = ๐ป๐ ๐๐๐ฅ โ๐ป๐ ๐๐๐ ๐ก ร ๐ผ๐๐ก๐๐๐ ๐๐ก๐ฆ
LEARNING ACTIVITIES
4. MODEL-BASED PRESCRIPTIONS
1. Shajesh wants to train at of ๐๐2 = 38 ๐๐ฟ ๐๐๐ ๐๐ but canโt run due to upper-body injury. Prescribe reasonable treadmill parameters for him to walk on an incline.
2. Su-Yun exercises by walking (in a flat city with 20 blocks/mile). You want her to exercise at 2.5 METs. Give her a simple instruction with practical units so that she can know that sheโs walking at the right speed.
[Practical units: 1 min 36 sec per block, 16 blocks every 10 min.Impractical units: 50 m/min, 0.63 blocks/min]
ACSM โWALKING EQUATIONโ
Fig 1 Measurement of HR and ๐O2 by the authors. The linear correlation between %VO2R %HRR is highly significant (๐ = 0.987, P<0.05%). The empirical relationship is consistent with %๐ป๐ ๐ =%VO2R.
y = 0.99 ยฑ 0.06 ๐ฅ + โ0.03 ยฑ 0.04 (95% CL)
Therefore HR measurements can be used to estimate ๐O2
โข HR reserve: ๐ป๐ ๐ = ๐ป๐ ๐๐๐ฅ โ ๐ป๐ ๐๐๐ ๐ก
โข ๐O2 reserve:
๐๐2๐ = ๐O2 ๐๐๐ฅโ ๐O2 ๐๐๐ ๐ก
Purchase heart rate monitors (fingertip pulse-oximeter โ $20)
Use ยผ mile track and treadmills at the school gym
๐O2 = ๐โ ๐ฃ cos ๐ + ๐๐ฃ ๐ฃ sin ๐ + ๐๐โ ๐ฃ ๐โ + ๐๐ฃ tan ๐ + ๐๐
(Eq 2)
%๐ป๐ ๐ =๐ป๐ โ ๐ป๐ ๐๐๐ ๐ก
๐ป๐ ๐ =
๐O2 โ ๐O2 ๐๐๐ ๐ก
๐๐2๐ = %๐๐2๐ (Eq 1)
V (mph) Grade HR (bpm) %HRR ๐O2 (๐๐ฟ
๐๐๐โ๐๐) METS Effort (W/kg) Efficiency
4.7 0% 130 58% 16 4.6 5.6 0%
2.3 12% 112 44% 22 6.4 7.8 15%
3.3 12% 144 69% 31 8.7 11 15%
Replace with pic of
incline treadmill?
๐โ = 0.1๐๐ฟ
๐ โ ๐๐
Work cost per horizontal meter
๐๐ฃ = 1.8๐๐ฟ
๐ โ ๐๐
Work cost per vertical meter
๐๐ = 3.5๐๐ฟ
๐๐๐ โ ๐๐
Power cost of resting (1 MET)