32-Year-old male, active male. Echo normal. Seven day hold ECG showed just less than 0.8. One percentage of, uh, beats. You see, this normal. Cardiac stress test is normal. Presence with, uh... Polar has done reading heart rate of, uh... 120. Heart rate is at, uh, 100 to 110 during rest between sets. Of resistance training. Mm-hmm. This has been the trend for the past two to three months. But today, he switched to... Potassium-containing salt. Tata's potassium salt, which contains around 70% sodium and 30% of potassium chloride salts. He consumed it in the breakfast and also at lunch. Now his heart rate is hardly going beyond 100. It's staying at 80 to 100 range. He has a balanced diet usually with, uh, 120 grams of banana per day, three di- dried figs, three dried prunes. A bunch of, uh, nuts. Vegetables. Add good carbs, fats, egg yolks. Six in number. What do you think is the explanation? And there is adequate hydration also.
potassium supplementation AND exercise
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Most likely explanations
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Normal physiologic and wearable variation
- Heart rate during resistance training changes substantially with rest duration, load, breathing pattern, temperature, sleep, caffeine, anxiety, hydration, and the timing of meals.
- Wrist-based Polar readings can also be less reliable during lifting because gripping, motion, sweat, and muscle tension affect the optical signal.
- A one-day change can easily be coincidence or measurement variation. Look for a consistent pattern across at least 1-2 weeks under comparable training conditions.
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Autonomic state and recovery
- A heart rate of 100-110 between sets is often not truly a resting heart rate. With short rests, heart rate may remain elevated due to sympathetic activation, adrenaline, accumulated fatigue, and reduced stroke volume during/after straining.
- Today’s lower values could reflect lighter training, longer inter-set rests, better sleep, less stimulant exposure, lower stress, or lower cumulative fatigue.
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Potassium might matter only if there was a real deficit, but that is unproven
- Potassium is central to cardiac electrical activity and muscle function. Low potassium can promote palpitations or arrhythmias.
- But in someone eating fruit, dried fruit, vegetables, nuts, and other whole foods, major dietary potassium deficiency is less likely unless there are losses or causes such as vomiting, diarrhea, heavy prolonged sweating, diuretics/laxatives, or a hormonal/renal issue.
- The reported normal echo and stress test, and a PVC burden under about 1%, are reassuring. A low PVC burden in a structurally normal heart is commonly benign, though the Holter report should be reviewed by the treating clinician.
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Potassium salt could also be unsafe if continued indiscriminately
- Potassium-containing salt is effectively a supplement, not just a harmless seasoning. Total intake from the diet you listed may already be substantial.
- Extra potassium is particularly risky with reduced kidney function, diabetes-related kidney disease, ACE inhibitors, ARBs, spironolactone/eplerenone, amiloride/triamterene, trimethoprim, and frequent NSAID use. The FDA potassium warning notes that impaired renal potassium excretion and several common drugs can lead to dangerous hyperkalemia.
- An ECG alone does not reliably exclude significant hyperkalemia. The medical literature notes that serious hyperkalemia may occur even without classic ECG changes.
What would clarify this safely
- Serum potassium, sodium, bicarbonate, magnesium, calcium
- Creatinine/eGFR and glucose
- Blood pressure
- A 12-lead ECG if the resting heart rate is repeatedly above 100 bpm or there are palpitations
- Review of medications, supplements, pre-workouts, caffeine/nicotine, decongestants, thyroid status, sleep, illness, and training load