Fitness Assessment and Evaluation
Screen first
Every assessment begins with informed consent and a health-history or PAR-Q screen. Resting measures (heart rate, blood pressure, height, weight, circumference) come first, then body composition, cardiorespiratory fitness, muscular fitness, and flexibility last, so accumulated fatigue does not contaminate later tests. Know the quality terms: reliability (consistency across trials), validity (measures what it claims), and objectivity (agreement between testers).
Interpreting the numbers
Estimated HRmax = 220 − age, with a standard error of roughly ±10–12 bpm - a population estimate, not a measurement. VO2max is expressed absolutely (L/min) or relative to body mass (mL/kg/min); relative values allow fair comparison between clients of different sizes. BMI is a quick screen that misclassifies muscular clients. Percentile norms, not raw scores, drive interpretation.
Safety and stopping rules
Contraindications to maximal testing include unstable cardiac symptoms, resting systolic pressure above 200 or diastolic above 110, and acute illness. Terminate a test for chest pain, dizziness, unusual dyspnea, a falling systolic pressure as workload rises, or an abnormal ECG.
Trap: questions often scramble the testing order, or ask you to treat a submaximal prediction as a directly measured VO2max - it is an estimate.
Worked example: A 40-year-old client has an estimated HRmax of 180 bpm. A 70% target = 0.70 × 180 = 126 bpm. Because the estimate may be off by 10 bpm, confirm effort with RPE (about 13–14, "somewhat hard") rather than trusting the number alone.