Hi Orris, I'm Aiswarya... My brother had hit the gym today after a break, and he did 45 kg of deadlifts for 15 times or so... He came back home dizzy and his BP was recorded as 93/68. He also said that whenever his BP is checked, the value of SBP was less than 100 mmHg... Is it concerning?
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post-exercise hypotension dizziness after deadlifts low blood pressure 93/68 systolic below 100
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Hi Aiswarya! Here's a thorough breakdown of what's going on with your brother.
What Happened After His Workout
Post-exercise hypotension (PEH) is a well-recognised physiological response, especially after intense resistance training like heavy deadlifts. During the set, his heart was pumping hard to push blood to his working muscles. When he stopped, those large blood vessels in his lower body remained dilated - but the demand for high cardiac output suddenly dropped. This creates a temporary mismatch where blood "pools" peripherally, venous return to the heart drops, and blood pressure falls.
His reading of 93/68 mmHg right after the workout is consistent with PEH. The dizziness is a direct consequence - his brain was getting slightly less blood than usual for a brief window. This is normal and usually self-resolves within 15-60 minutes.
The More Important Question: Chronically Low SBP
The fact that his SBP is consistently below 100 mmHg across multiple readings is worth understanding. There are two ways to look at this:
1. Constitutional (Idiopathic) Low BP - Most Likely in His Case
Many young, fit, healthy individuals - particularly lean males - have a baseline SBP in the 90-100 range. This is called constitutional hypotension and is NOT a disease. It simply means his resting vascular tone is naturally lower. There are no symptoms at rest, and it carries no long-term harm. In fact, consistently lower BP over a lifetime is associated with less cardiovascular disease, not more.
2. Orthostatic Hypotension - Rule This Out
Harrison's Principles of Internal Medicine (22e) defines orthostatic hypotension (OH) as:
"A sustained reduction of SBP ≥20 mmHg or DBP ≥10 mmHg within 3 minutes of active standing."
Symptoms include lightheadedness, near-fainting, and palpitations - triggered particularly by exercise, prolonged standing, dehydration, or large meals. The key variant to watch for: even a small SBP drop can be symptomatic when baseline SBP is already low (90-100 mmHg).
Is 93/68 After Exercise Concerning?
Not immediately alarming, but here's how to interpret the full picture:
| Factor | Assessment |
|---|---|
| Post-exercise dizziness | Expected with PEH; resolves with rest |
| 93/68 right after intense exercise | Within the range of normal PEH |
| Consistently SBP < 100 on all readings | Needs attention - rule out underlying cause |
| Age & fitness of brother | Young + first gym session after a break = higher PEH risk |
The reading of 93/68 crosses the clinical threshold cited in Morgan & Mikhail's Clinical Anesthesiology (7e) which defines hypotension as SBP < 100 mmHg, and in the Family Medicine textbook, adult hypotension is listed as SBP < 100 mmHg. So while it's not an emergency, it's not something to dismiss either.
Why "After a Break" Matters
Returning to heavy lifting after a break is a known trigger. Cardiovascular deconditioning during the break means:
- Reduced plasma volume
- Lower resting vascular tone
- Blunted compensatory responses during sudden exertion
45 kg deadlifts for 15 reps is also significant volume - this creates sustained Valsalva-like pressure changes and large post-set vasodilation.
What Could Cause Persistently Low BP? (Worth Ruling Out)
If his BP is always low (not just post-exercise), a doctor should check for:
- Dehydration / low salt intake - very common and easily corrected
- Adrenal insufficiency (Addison's disease) - rare but presents with chronic low BP, fatigue, salt craving
- Hypothyroidism - can lower vascular tone
- Cardiac conditions - low output states (unlikely in a young gym-goer, but worth knowing)
- Medications - any antihypertensives, alpha-blockers, antidepressants?
- Autonomic dysfunction - rare in young people, but orthostatic hypotension can be a sign
Goldman-Cecil Medicine notes that the goal of managing orthostatic hypotension is symptom improvement, and first-line steps are non-pharmacologic: hydration, salt intake, gradual position changes, and avoiding triggers.
Practical Advice for Your Brother Right Now
- Hydrate well before, during, and after workouts - low plasma volume amplifies PEH
- Don't stand up abruptly after sets - sit for 1-2 minutes before walking around
- Eat something before the gym - exercising fasted worsens hypotension
- Cool down properly - 5-10 minutes of walking after heavy sets helps redistribute blood flow
- Increase salt intake mildly if he's on a low-sodium diet
- Get a resting BP checked - ideally seated, after 5 minutes of quiet rest, at a clinic, to establish a true baseline
Bottom Line
The episode today - dizziness + 93/68 after returning to heavy deadlifts - is most likely post-exercise hypotension on a background of constitutional low BP, which is common in young, thin, or fit individuals. It's not an emergency, but the pattern of consistently low SBP warrants a check-up with a doctor to rule out any underlying cause, especially if he ever has episodes of near-fainting, chest discomfort, or extreme fatigue. A simple blood test (electrolytes, thyroid, cortisol) and a proper BP assessment can give peace of mind.
This is educational information, not a substitute for a medical consultation. Since this pattern is consistent, a visit to a doctor for a proper evaluation is worthwhile.
Thank you 😌
You're welcome, Aiswarya! 😊 Hope your brother recovers well and eases back into his gym routine safely. Take care, both of you!
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