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Related Concept Videos

Overview of Carbohydrate Metabolism01:19

Overview of Carbohydrate Metabolism

Carbohydrate metabolism is a fundamental biochemical process that ensures a constant supply of energy to living cells. The most important carbohydrate is glucose, which can be broken down via glycolysis to enter into the Krebs cycle and eventually lead to the production of ATP through oxidative phosphorylation.
Glucose transport into cells is facilitated by a family of transport proteins called GLUT (Glucose Transporters). GLUT4 is the primary glucose transporter for insulin-stimulated glucose...
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...
Carbohydrate Metabolism01:36

Carbohydrate Metabolism

Carbohydrates are polymers composed of molecules containing atoms of carbon, hydrogen and oxygen. One gram of carbohydrate can provide four kilo-calories of energy, which makes it the most efficient instant energy source.
Starch accounts for approximately 60% of the carbohydrates consumed by humans. Since amylase enzymes cannot function in the stomach's acidic environment, starch can only be digested in the mouth and small intestine. Simple sugars are found naturally in milk and fruits in the...
Carbohydrate Metabolism01:36

Carbohydrate Metabolism

Carbohydrates are polymers composed of molecules containing atoms of carbon, hydrogen and oxygen. One gram of carbohydrate can provide four kilo-calories of energy, which makes it the most efficient instant energy source.
Starch accounts for approximately 60% of the carbohydrates consumed by humans. Since amylase enzymes cannot function in the stomach's acidic environment, starch can only be digested in the mouth and small intestine. Simple sugars are found naturally in milk and fruits in the...
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...
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...

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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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Oral carbohydrate sensing and exercise performance.

Asker E Jeukendrup1, Edward S Chambers

  • 1School of Sport and Exercise Sciences, University of Birmingham, Edgbaston, Birmingham, UK. A.E.Jeukendrup@bham.ac.uk

Current Opinion in Clinical Nutrition and Metabolic Care
|May 11, 2010
PubMed
Summary
This summary is machine-generated.

Carbohydrate intake during high-intensity exercise enhances performance, potentially via central nervous system pathways rather than metabolism. Carbohydrate mouth rinses show similar benefits, suggesting a signaling effect.

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Area of Science:

  • Exercise Physiology
  • Neuroscience
  • Sports Nutrition

Background:

  • Carbohydrate intake during exercise improves performance, particularly in high-intensity, short-duration activities.
  • The ergogenic effects are increasingly attributed to central nervous system mechanisms, not solely metabolic advantages.

Purpose of the Study:

  • To explore the non-metabolic mechanisms of carbohydrate's ergogenic effect during exercise.
  • To investigate the role of carbohydrate mouth rinses in exercise performance.
  • To understand the signaling pathways involved in carbohydrate's impact on motor output.

Main Methods:

  • Review of existing literature on carbohydrate intake and exercise performance.
  • Analysis of studies utilizing carbohydrate mouth rinses to assess performance changes.
  • Examination of potential neural pathways and oral receptors involved.

Main Results:

  • Carbohydrate mouth rinses elicit performance improvements similar to traditional carbohydrate feeding.
  • These benefits suggest carbohydrate acts as a positive afferent signal influencing motor output.
  • The effects are carbohydrate-specific and independent of taste, with unidentified oral receptors.

Conclusions:

  • Carbohydrate detection in the oral cavity by unknown receptors is linked to enhanced exercise performance.
  • The findings support a central nervous system-mediated ergogenic effect of carbohydrates during exercise.
  • Further research is needed to identify oral receptors and elucidate taste transduction pathways for carbohydrates.