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Related Concept Videos

Glucose Homeostasis: Regulation of Blood Glucose01:02

Glucose Homeostasis: Regulation of Blood Glucose

Carbohydrates consumed through foods are converted into glucose, a crucial energy source for the body. In the prandial state, high blood glucose levels stimulate the secretion of insulin from the pancreas. Insulin inhibits hepatic glucose production and stimulates glucose uptake and metabolism by muscle and adipose tissue. The excess glucose is converted into glycogen and stored in the liver and muscles.
During fasting, when blood glucose levels are low, the pancreas secretes glucagon. it...
Hormones Regulating Blood Glucose01:16

Hormones Regulating Blood Glucose

Insulin is released by beta cells of the pancreas when blood glucose levels are high. It facilitates glucose absorption and utilization in insulin-dependent cells with insulin receptors on their plasma membranes. Insulin promotes glucose uptake by increasing the number of glucose transport proteins in the cell membrane, allowing glucose to enter the cell. As a result, glucose utilization and ATP production are enhanced.
In addition to accelerating glucose uptake and utilization, insulin has...
Oral Hypoglycemic Agents: α-Glucosidase Inhibitors01:19

Oral Hypoglycemic Agents: α-Glucosidase Inhibitors

α-glucosidase inhibitors, including acarbose (Precose), miglitol (Glyset), and voglibose (Voglib) (primarily available in Asia), are drugs that control blood sugar levels by delaying the digestion of starch and disaccharides. They achieve this by inhibiting α-glucosidase enzymes in the intestine, which slow the absorption of carbohydrates in the intestine, which in turn leads to a prolonged release of the glucoregulatory hormone GLP-1 from intestinal L-cells.
Acarbose and miglitol are typically...
Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Hypoglycemia01:26

Hypoglycemia

Hypoglycemia is a blood glucose level below 70 mg/dL. It commonly occurs in individuals using insulin or insulin-secreting drugs, but may also arise in non-diabetic conditions. People with type 1 diabetes are at the highest risk because they depend on exogenous insulin. People with type 2 diabetes are also at risk, especially when treated with insulin or medications such as sulfonylureas, which increase insulin release regardless of blood glucose levels. It develops when insulin levels exceed...
Hyperglycemia01:29

Hyperglycemia

Hyperglycemia is an abnormally high blood glucose level. It is diagnosed by fasting glucose ≥126 mg/dL, 2-hour oral glucose tolerance test (or OGTT) ≥200 mg/dL, random glucose ≥200 mg/dL with symptoms, or HbA1c ≥6.5%. However, HbA1c results may be unreliable in certain conditions, such as anemia or hemoglobinopathies, and the diagnosis should be confirmed unless classic symptoms are present. Postprandial hyperglycemia is typically considered significant when glucose levels exceed 180 mg/dL two...

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Randomized Controlled Trial to Study the Acute Effects of Strength Exercise on Insulin Sensitivity in Obese Adults
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Glycaemic index, glycaemic load and exercise performance.

John O'Reilly1, Stephen H S Wong, Yajun Chen

  • 1Department of Sports Science and Physical Education, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, China.

Sports Medicine (Auckland, N.Z.)
|December 22, 2009
PubMed
Summary

The glycaemic index (GI) and glycaemic load (GL) impact exercise performance. While low-GI pre-exercise meals may offer benefits, GL might be a more comprehensive measure for sports nutrition. Further research is needed.

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Area of Science:

  • Sports Nutrition
  • Human Physiology
  • Nutritional Science

Background:

  • The glycaemic index (GI) ranks carbohydrate foods by their blood glucose response.
  • GI is used in sports nutrition, but its effectiveness is debated.
  • The glycaemic load (GL) is a newer concept considering both carbohydrate amount and quality.

Purpose of the Study:

  • To review the current understanding of GI and GL in sports nutrition.
  • To evaluate the impact of GI and GL on exercise performance and capacity.
  • To explore the potential of GL as a predictor of glycaemic responses.

Main Methods:

  • Literature review of studies on GI and GL in relation to exercise.
  • Analysis of research on pre-exercise meals and carbohydrate ingestion during exercise.
  • Comparison of GI and GL as predictors of glycaemic response.

Main Results:

  • Low-GI pre-exercise meals may enhance endurance performance and substrate utilization.
  • The benefits of GI strategies across multiple meals for athletes are unclear.
  • Carbohydrate intake during exercise may diminish the effects of pre-exercise GI meals.
  • GL is a novel concept with emerging evidence suggesting it may be a better predictor of glycaemic response than GI alone.

Conclusions:

  • The role of GI in sports nutrition remains controversial.
  • GL shows potential as a more accurate indicator of dietary glycaemic impact for athletes.
  • Further research is essential to fully understand the application of GL in sports nutrition.