Can weight training affect insulin sensitivity?

Question

Hello doctor,

I am a 24-year-old male with Type 1 diabetes (T1D) for eight years. Recently, I have been experiencing frequent hypoglycemic episodes, particularly in the midnight hours.

Last night, my blood sugar dropped to 58 mg/dL, and I woke up sweating profusely. I am using an insulin pump and have already reduced my basal rate, but I am still having these lows. Could my recent weight training be affecting my insulin sensitivity?

I have also noticed that my pump insertion sites seem to absorb insulin differently—some days I need more insulin than usual. Should I be rotating my sites more frequently? Lastly, what signs should I be on the lookout for regarding diabetic ketoacidosis?

Kindly help.

Thank you.

Answer 1

Hello,

Welcome to icliniq.com.

I read your query and understand your concern.

Your weight training could be contributing to increased insulin sensitivity, especially if it is more intense or frequent than usual. Resistance training has delayed effects on blood glucose, meaning insulin sensitivity can remain elevated for several hours, or even into the night.

Since your lows occur at midnight, consider having a small, protein-rich snack before bed. This may help stabilize your blood glucose overnight.

Regarding your insulin pump and site rotation, inconsistent absorption is a common issue with pump use. Over time, repeatedly using the same sites can lead to lipo hypertrophy (small lumps or areas of thicker skin), which can impair insulin absorption and cause unpredictable blood sugar levels.

You should rotate your sites more frequently try using different areas like the abdomen, thighs, or upper arms, and ensure each site has time to fully heal before reusing it.

As for diabetic ketoacidosis (DKA), this complication can arise if there are:

Persistently high blood glucose levels (usually above 250 mg/dL).
Excessive thirst and frequent urination, as the body tries to flush out excess glucose.
Fruity-smelling breath and deep, rapid breathing (Kussmaul breathing), which are signs of acidosis.
Nausea, vomiting, and abdominal pain as DKA progresses.
Fatigue, confusion, or difficulty focusing, which can indicate dehydration and electrolyte imbalances.

It is important to get a physical exam from an endocrinologist as soon as possible.

I hope that you get your answer.

Please let me know if you need any help.

Thank you.