The exercise tolerance test is the most common test used to evaluate workload capacity
and detect cardiac abnormalities.
Driver should be able to:
- Exercise to a workload capacity greater than 6 Metabolic Equivalents
(METs) (through Bruce protocol stage II or equivalent).
- Attain a heart rate greater than or equal to 85% of predicted maximum
(unless on beta blockers).
- Have a rise in systolic blood pressure greater than or equal to 20
mm Hg without angina.
- Have no significant ST segment depression.
NOTE: METs — Extensive literature exists on the energy requirements
for many physical tasks.
- Sedentary activity requires fewer than 2 METs. These activities include
sitting, slow walking, and lifting light objects of no more than 10 pounds.
- Light work requires 2 to 4 METs and includes carrying lightweight
objects of no more than 20 pounds.
- Medium work requires 4 to 6 METs and includes carrying moderate weight
objects of up to 50 pounds.
- Heavy and very heavy work requires greater than 6 METs and includes
carrying heavy objects and climbing stairs rapidly.
Medical fitness for duty includes the ability to perform strenuous work. Overall
requirements for commercial drivers along with the specific requirements in the
job description should be deciding factors in the certification process.