It depends on the case; there is no single guideline.
Effect by goal · level of evidence
Blood sugar control in type 2 diabetes
improvesLowstudy (AA)
Small crossover trial (11 men with type 2 diabetes): AFTERNOON interval training improved 24-hour blood sugar more than the same exercise in the morning. Very small sample, to be confirmed.
Blood sugar control in type 2 diabetes — improves (Low, study). Small crossover trial (11 men with type 2 diabetes): interval training in the AFTERNOON improved 24-hour blood sugar more than the same exercise in the morning. Very small sample, to be confirmed. 30426166
Information, not medical advice. Prescription drugs require a doctor.
Information, not medical advice. Scientific evidence reflects the quality of the studies.