The Warehouse Manager Who Wants HIIT
Marcus, 54, runs a distribution warehouse and has been inactive for 3 years. He wants to start high-intensity interval training four mornings a week because a coworker lost weight that way. Intake: 178 cm, 101 kg (BMI 32), resting BP 146/90 (average of two seated readings) on lisinopril 20 mg, resting HR 78. He reports no chest pain, unusual dyspnea, dizziness, or claudication, and has no known cardiac, pulmonary, renal, or metabolic disease. His father had an MI at 52; his mother is alive at 80. He quit smoking 8 years ago. Last year's lipids: LDL 118 mg/dL, HDL 38 mg/dL. No orthopedic complaints. He asks you to write the HIIT program today, before he leaves.
1. Which of Marcus's data meet ACSM risk-factor criteria, which do not, and what risk category does he fall into?
Read the worked answer
Work through the criteria one at a time rather than tallying impressions:
- Age - male 45 or older: counts.
- Family history - father with MI before age 55 (he was 52 in a male first-degree relative): counts.
- Hypertension - SBP 146 is at or above the 130/80 threshold, and he is on medication: counts.
- Obesity - BMI 32 is at or above 30: counts.
- Sedentary - fewer than 30 min of moderate activity on 3 d/wk for 3 months: counts.
- Dyslipidemia - HDL 38 is below 40 mg/dL, so it counts; LDL 118 is below the 130 threshold, so it does not.
- Smoking - quit 8 years ago; not a current smoker, so no point.
- Negative factor - HDL of 60 or higher would subtract one; he does not qualify.
- Unknown, do not assume - A1c, fasting glucose, and waist circumference were not measured, so prediabetes cannot be counted either way.
Six risk factors puts him in the moderate-risk category of the classic three-tier scheme. The practical caution: risk-factor counting is now used to guide monitoring and program design, not to trigger medical clearance on its own - so do not stop the analysis here.
2. Does Marcus need medical clearance before he starts? Justify your answer with ACSM's current clearance logic, and say what you do about the 146/90 this week.
Read the worked answer
Use the two-branch algorithm: he has no known cardiovascular, metabolic, or renal disease and no signs or symptoms, so the decision turns on intensity and his current activity level.
- He is sedentary, so he does not meet the 'regular exercise' definition.
- He is asking for vigorous-intensity work (HIIT), which is the branch where medical clearance is recommended for a sedentary person.
- If he instead chose moderate-intensity continuous exercise, clearance would not be required.
So: clearance is indicated for his stated plan, not for all exercise. Meanwhile, 146/90 is above goal on treatment but is well below the ACSM threshold for withholding exercise (about 180/110). Do not clear him yourself and do not tell him his BP is fine - recheck on the day of each session, and send him back to his prescriber for BP management, because a value that high on medication suggests the regimen needs review. Document the referral.
Practical resolution: begin moderate walking now under your supervision while the clearance is pending, and hold the HIIT until the signed clearance is in hand.
3. Assume clearance arrives. What do you actually prescribe for the first four weeks, and what findings would make you terminate a session?
Read the worked answer
Clearance does not mean starting where he wants to start. Build a base first:
Weeks 1-2 - 3-4 d/wk of 20-25 min continuous walking or cycle at RPE 11-12 (roughly 40-50% heart rate reserve), plus 2 d/wk of 8 basic resistance exercises, 1-2 sets of 10-12 reps. Weeks 3-4 - extend to 30 min and 4-5 d/wk, moving toward 150 min/wk, and only then introduce one low-volume interval session per week (for example 4 x 1 min at RPE 15-16 with 2 min easy recovery), never on consecutive days.
He needs the base because unaccustomed vigorous work in a sedentary 54-year-old with his risk profile is where problems occur, and because a program he can sustain beats a program that matches his coworker's.
Terminate and refer for chest pain or pressure, disproportionate dyspnea, dizziness or confusion, pallor or cyanosis, an abnormal heart rate response (failure to rise, or a sudden drop), measured BP that climbs above roughly 220/110 or falls below resting, or new claudication. Track the day-of-session BP as described above.