EXS 411 Prescribing Intensity for CRE - Exam 2

methods of determining exercise intensity

HRR method/karovonen, peak HR method, peak VO2 method, VO2R method, talk test, RPE

3 possibilities for translating intensity

THR based on % HRR or peak HR; target workload calculated from % VO2R, Peak VO2, peak METS or MET tables or equations; subjective rating (talk test or RPE)

HRR or Karvonen method

HRR = (MHR-RHR)(desired intensity) + RHR; most accurate

how do you find MHR

207 - (0.7 x age)

Peak HR Method (%HRmax)

%HRmax = (207 - (0.7 x age)) x (desired intensity); not as accurate; easier calculation

percentage of VO2R

allows intensity to be expressed as an absolute workload

3 steps for percentage of VO2R

selected desired intensity in VO2R units; calculate the target VO2 using the VO2R formula; convert target VO2 to a workload using ACSM metabolic equations 

VO2R formula

Target VO2 = (VO2max - resting VO2) x (desired intensity) + Resting VO2

METs

simple energy equivalents that can be used by the general public to gauge exercise intensity

one MET is equal to what

3.5 mL/kg/min

2 drawbacks with percentage of VO2 max

does not translate directly into HRR units; does not provide equivalent relative intensities for individuals with different fitness levels

simple calculation for percentage of VO2 max

Target VO2 = desired intensity x VO2max

what if our client is taking a beta blocker

cant prescribe anything using HRR

perceived exertion

many people can regulate intensity based on how hard it feels; consider overall feeling of exertion

RPE

1-10 (category ration scale); 6-20 (original scale)

talk test method

subjective method of relative intensity