J Korean Diabetes Assoc.  2005 Sep;29(5):479-485.

Evaluation of Physical Capacity and Proper Calculation Method of Exercise Intensity based on Measured Maximal Heart Rate in Korean Type 2 Diabetics

• An KH
• Han KA
• Min KW

Abstract

BACKGROUND: Prescription of aerobic exercise for type 2 diabetics in clinical practice is frequently based on exercise intensity at percent heart rate max(60METHODS
Total five hundreds eighty one Korean type 2 diabetics without complications (age: 51.6+/-10.8years, body mass index: 25.0+/-3.2kg/m2) were enrolled. VT was determined breath by breath during gradual loading exercise test. Rate of oxygen consumption (VO2), work rate(WR), heart rate(HR), percent HRmax, and percent HRreserve were measured at ventilatory threshold and maximal exercise. We made a new formula to calculate the maximal heart rate through linear regression analysis of relationship between measured maximal heart rate and age.
RESULTS
METs, HR and load at maximal exercise in Korean with type 2DM were 5.2+/-1.3METs, 137.4+/-16.4beats/min and 96.8+/-30.9watts. METs, HR and load at VT for Korean with type 2DM were 3.5+/-0.9METs, 113.6+/-11.8beats/min and 55.8+/-21.5watts. %HRmax of Korean type 2 diabetics were 66.6+/-7.3%, which was within the range of ADA recommendation. But Correlation between HR and age was lower than the r=-0.603 recommended by ACSM, So We made a new formula[172-(0.675 x age)] based on measured maximal HR. Percent HRreserve was 34.7+/-11.5% which was lower compared with ADA recommendation.
CONCLUSION
Our results indicate the reduced exercise capacity in Korean type 2 diabetics (VO2max 5.2+/-1.3METs, VT 3.5+/-0.9METs). Also we recommend a new formula[172-(0.675 x age)] to calculate maximal heart rate based on measured HRmax.

Keyword

Ventilatory threshold(VT); %HRmax; %HRreserve

MeSH Terms

Body Mass Index
Exercise
Exercise Test
Heart Rate*
Heart*
Linear Models
Oxygen Consumption
Prescriptions