by GAVULLA RAVINDER REDDY
(HYDERABAD-CITY, TELANGANA -STATE- INDIA -COUNTRY)
QUESTION: How does exercise lower blood glucose at the cellular level? Does every red blood cell become glycated, and what does an HbA1c test measure? My fasting glucose is 113 mg/dL, two-hour post-meal glucose is 139 mg/dL, HbA1c is 6.4%, triglycerides are 267 mg/dL, HDL is 39 mg/dL, and urine microalbumin is 42 mg/L. Please explain these results.
Contracting muscles move GLUT4 glucose transporters to the cell surface, allowing more glucose to enter muscle with less dependence on insulin. Regular activity also improves insulin sensitivity. Fasting glucose of 113 mg/dL and HbA1c of 6.4% are in the prediabetes range if you have not been diagnosed with diabetes, but confirmation is needed. Triglycerides of 267 mg/dL are high. Urine microalbumin reported only in mg/L should be clarified with a urine albumin-to-creatinine ratio.
Answer by Dr. Albana Greca, MD, MMedSc
Hello Gavulla Ravinder Reddy,
Your questions about exercise and HbA1c are important. Your results do not show an immediate emergency, but several values need follow-up rather than being described as completely normal.
At rest, insulin activates signals that move GLUT4 transporters from storage sites inside muscle cells to the outer membrane. GLUT4 then allows glucose to enter the cell.
During exercise, muscle contraction activates a partly separate pathway. Changes in cellular energy and calcium also move GLUT4 to the cell surface, so active muscle can take up more glucose even when insulin action is impaired. The glucose is then used for energy or stored as glycogen.
After exercise, muscles often remain more sensitive to insulin. Regular training can increase muscle GLUT4, improve fitness and insulin sensitivity, and support weight and triglyceride control. Our guide to exercise and diabetes explains how to build activity safely.
Glucose slowly attaches to hemoglobin inside red blood cells without the help of an enzyme. All circulating red cells are exposed to glucose, but they do not contain exactly the same amount of glycated hemoglobin. Older cells have generally been exposed longer, and higher average glucose produces more glycation.
HbA1c measures the percentage of hemoglobin A that is glycated in the blood sample; it does not count sugar molecules on selected cells. Because red cells circulate for about 120 days, HbA1c reflects roughly the previous two to three months. Conditions affecting red-cell lifespan, hemoglobin, bleeding, transfusion, or anemia can alter the result. See our guide to HbA1c and average glucose.
These results suggest a high risk of type 2 diabetes. If you have no classic symptoms, diagnosis should not be based on one test. Ask whether to repeat HbA1c or fasting plasma glucose. Our overview of blood tests for diabetes explains confirmation. Negative urine glucose does not rule out prediabetes or diabetes because the kidney threshold for glucose varies.
Triglycerides of 267 mg/dL are high. HDL of 39 mg/dL is also lower than desirable for many adult men. LDL of 65 mg/dL is favorable, but overall cardiovascular risk requires more than one cholesterol value.
Ask whether the lipid test was fasting and whether high glucose, alcohol, refined carbohydrates, excess weight, thyroid disease, kidney or liver disease, or medicines could be contributing. Helpful measures usually include limiting sugary drinks, sweets, refined starches, and alcohol; choosing high-fiber foods and unsaturated fats; managing weight; and exercising. Our guide to carbohydrates and glycemic index can help with meal planning.
A urine albumin result reported only as 42 mg/L depends on how concentrated the urine is. The preferred test is a spot urine albumin-to-creatinine ratio (UACR), reported in mg/g. Ask whether UACR was calculated and whether it should be repeated. One abnormal urine result does not establish chronic kidney disease.
Serum creatinine of 1.0 mg/dL is reassuring in isolation, but kidney assessment should use an estimated GFR based on age, sex, and creatinine together with UACR. A timed creatinine-clearance result can be inaccurate if urine collection is incomplete.
If your doctor finds no contraindication, gradually work toward at least 150 minutes of moderate aerobic activity weekly, spread over at least three days, plus resistance exercise two or three times weekly. Start according to your fitness level rather than beginning with intense running. A 10–15 minute walk after meals can be practical.
Use a blood sugar and activity log to compare exercise, meals, fasting readings, and post-meal patterns.
Stop exercising and seek medical advice for chest pain, fainting, severe shortness of breath, new neurological symptoms, or unusual palpitations. People using insulin or medicines that can cause hypoglycemia need an individualized exercise plan. Do not exercise with severe hyperglycemia, dehydration, illness, or possible ketones without medical guidance.
Arrange follow-up for repeat glucose testing, a fasting lipid profile, blood pressure review, and a properly reported UACR. Ask your doctor to review the mildly high hemoglobin and PCV using the laboratory’s reference ranges, especially if you smoke, live at altitude, may be dehydrated, or have possible sleep apnea.
Educational safety note: This answer is for general diabetes education only. It does not replace personal medical advice, diagnosis, or treatment. Do not start, stop, or change medicines, supplements, diet, or exercise plans without speaking with your healthcare provider.
Last reviewed: July 2026.
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