Woman drinking water after a workout - Why Do I Always Get Dizzy During HIIT Sessions? - Women's Health UK

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Feeling sick after working out? Don’t worry, you’re not alone.

If you’re spinning out mid-set, which isn’t uncommon, there’s been a drop in your blood sugar, blood pressure or pH levels.

But why? WH spoke to Dr Kristin J Speaker, physiologist at Anshutz Health and Wellness Center, US, to find out.


‘Blood gets more acidic during high-intensity exercise, since your muscles release lactic acid as they work,’ explains Dr Kristin J Speaker, physiologist at Anschutz Health and Wellness Center, US.

Her tip for steady blood sugar? Don’t eat anything for three hours before you train. ‘Your liver and muscles have plenty of stored glycogen (blood sugar molecules) to sustain you,’ she says. ‘Plus, eating releases insulin, which causes your body to absorb sugar from your blood.’

And what of blood pressure? Keep levels steady by swigging 350ml of water during your session — and warm up and cool down for at least five minutes.

As for the lactic acid-induced pH drop? That will ease as you adjust to your training plan. Prescription: sweat.

Working out? Train like Gemma Atkinson or try these arm workouts.