Module 3: Diabetes and Exercise Principles
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Questions and Answers

What is the primary cause of Type 1 diabetes?

  • Destruction of beta cells in the pancreas (correct)
  • Obesity
  • Glucose intolerance during pregnancy
  • Insulin resistance
  • Type 2 diabetes is characterized by an inability to utilize insulin due to autoimmune destruction.

    False (B)

    Name one potential complication that can arise with exercise in diabetics.

    Hypoglycemia

    Gestational diabetes is a type of diabetes that occurs during __________.

    <p>pregnancy</p> Signup and view all the answers

    What is one of the treatment goals for diabetes management?

    <p>Decrease blood glucose levels (C)</p> Signup and view all the answers

    Match the types of diabetes to their descriptions:

    <p>Type 1 = Autoimmune destruction of pancreas Type 2 = Insulin resistance and defective secretion Gestational = Glucose intolerance during pregnancy Diabetes = Chronic metabolic disease characterized by hyperglycemia</p> Signup and view all the answers

    Glucose transport into skeletal muscle can only occur when insulin is present.

    <p>False (B)</p> Signup and view all the answers

    What is the role of exercise in the management of diabetes?

    <p>Exercise helps manage blood glucose levels.</p> Signup and view all the answers

    What percentage of insulin-stimulated glucose uptake occurs in skeletal muscle?

    <p>50-80% (D)</p> Signup and view all the answers

    Insulin resistance in adipose tissue (AT) occurs after skeletal muscle becomes insulin resistant.

    <p>False (B)</p> Signup and view all the answers

    What is the primary consequence of the accumulation of reactive lipids in skeletal muscle?

    <p>Impairment of insulin signaling</p> Signup and view all the answers

    The key transporter that insulin stimulates the movement of to the skeletal muscle membrane is __________.

    <p>GLUT-4</p> Signup and view all the answers

    Match the following complications with their definitions:

    <p>Peripheral neuropathies = Nerve damage leading to weakness and pain Nephropathies = Kidney damage due to high blood sugar Retinopathies = Damage to the blood vessels in the retina Diabetic foot ulcers = Open sores resulting from nerve damage and poor circulation</p> Signup and view all the answers

    What is a common symptom of hyperglycemia?

    <p>Headache (D)</p> Signup and view all the answers

    Diabetic ketoacidosis is characterized by hyperglycemia, ketosis, and metabolic alkalosis.

    <p>False (B)</p> Signup and view all the answers

    What A1C percentage is generally considered a target for most people with diabetes?

    <p>7%</p> Signup and view all the answers

    What does the A1C blood test measure?

    <p>Average blood sugar level over the past 120 days (D)</p> Signup and view all the answers

    The target LDL cholesterol for managing diabetes should be less than 2.5 mmol/L.

    <p>False (B)</p> Signup and view all the answers

    Name one oral anti-hyperglycemic medication used to manage diabetes.

    <p>Metformin</p> Signup and view all the answers

    Regular _________ is crucial for diabetes management.

    <p>exercise</p> Signup and view all the answers

    Match the management strategies with their descriptions:

    <p>A1C Test = Average blood sugar over 120 days LDL = Bad cholesterol levels Metformin = Oral medication for diabetes Exercise = Physical activity to maintain health</p> Signup and view all the answers

    Which of the following should be controlled to less than 130/80 mmHg for diabetes management?

    <p>Blood Pressure (D)</p> Signup and view all the answers

    High Intensity Interval Training (HIIT) is recommended for individuals who are not physically fit.

    <p>False (B)</p> Signup and view all the answers

    What is one of the primary treatment goals for diabetes?

    <p>Medication</p> Signup and view all the answers

    What is one key effect of exercise on glucose transport?

    <p>It stimulates glucose transport independent of insulin (A)</p> Signup and view all the answers

    Individuals who exercise regularly are typically less insulin sensitive despite high IMTG levels.

    <p>False (B)</p> Signup and view all the answers

    Name one substance that accumulates as a result of muscle contraction during exercise.

    <p>Ca2+ or ADP or ROS</p> Signup and view all the answers

    A single session of exercise can markedly improve _____ sensitivity.

    <p>insulin</p> Signup and view all the answers

    What signaling cascade is stimulated during exercise to aid glucose uptake?

    <p>AMPK and CaMK activation (B)</p> Signup and view all the answers

    Match the following components to their role in glucose transport during exercise:

    <p>GLUT-4 = Facilitates glucose uptake ADP = Signaling molecule accumulation Ca2+ = Stimulates signaling cascade ROS = Indicates metabolic stress</p> Signup and view all the answers

    The expression of lipogenic enzymes such as DGAT1 increases after acute exercise.

    <p>True (A)</p> Signup and view all the answers

    What is the term for the observed phenomenon where athletes have high IMTG levels yet remain insulin sensitive?

    <p>athlete's paradox</p> Signup and view all the answers

    What effect does acute exercise have on plasma glucose levels in diabetics?

    <p>It reduces plasma glucose levels. (B)</p> Signup and view all the answers

    The translocation of GLUT-4 to the plasma membrane is impaired in diabetics after exercise.

    <p>False (B)</p> Signup and view all the answers

    What is one key benefit of acute exercise regarding lipid-induced insulin resistance?

    <p>Acute exercise prevents lipid-induced insulin resistance.</p> Signup and view all the answers

    Acute exercise enhances both insulin and exercise stimulated __________ transport.

    <p>glucose</p> Signup and view all the answers

    Match the following terms with their descriptions:

    <p>GLUT-4 = Transports glucose into cells IMTG = Intramuscular triglycerides SCD1 = Stearoyl-CoA desaturase 1 T2DM = Type 2 diabetes mellitus</p> Signup and view all the answers

    What was the effect of an 18-hour lipid infusion on insulin sensitivity?

    <p>It induces insulin resistance. (A)</p> Signup and view all the answers

    Acute exercise increases the abundance of mGPAT and DGAT1 after exercise.

    <p>True (A)</p> Signup and view all the answers

    What is the relationship between acute exercise and muscular triglyceride storage?

    <p>Acute exercise increases intramuscular triglyceride storage.</p> Signup and view all the answers

    What is one direct benefit of chronic exercise training in diabetics?

    <p>Improves insulin action and blood glucose control (D)</p> Signup and view all the answers

    Exercise can trigger glucose transport independently of insulin resistance.

    <p>True (A)</p> Signup and view all the answers

    What is the role of GLUT-4 in glucose transport?

    <p>Insulin stimulates the movement of GLUT-4 to the skeletal muscle membrane.</p> Signup and view all the answers

    Chronic exercise training can help reduce the risk factors for type 2 diabetes, such as __________ and obesity.

    <p>hypertension</p> Signup and view all the answers

    Match the following benefits of exercise in diabetics with their corresponding category:

    <p>Improve insulin action = Direct Benefit Reduce cardiovascular risk = Indirect Benefit Enhance metabolic fitness = Indirect Benefit Reduce hyperglycemia = Direct Benefit</p> Signup and view all the answers

    Which of the following best describes the impact of high lipid environments on insulin?

    <p>Result in insulin resistance and hyperglycemia (B)</p> Signup and view all the answers

    Annual CVD risk factor assessments are not necessary for individuals with diabetes mellitus.

    <p>False (B)</p> Signup and view all the answers

    What can acute and chronic exercise reduce in diabetics?

    <p>Reactive lipids and insulin resistance.</p> Signup and view all the answers

    Flashcards

    Type 2 Diabetes

    A metabolic disease where the body becomes resistant to insulin, leading to high blood sugar.

    Blood Glucose Control

    The process of maintaining the right amount of sugar (glucose) in the bloodstream.

    Insulin's Role in Blood Sugar

    Insulin helps glucose move from the blood into cells for energy use.

    Exercise and Glucose

    Exercise can help glucose move into cells, even without insulin.

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    Type 1 Diabetes

    An autoimmune disease where the body attacks and destroys the insulin-producing cells in the pancreas.

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    Hyperglycemia

    High blood sugar levels.

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    Insulin Resistance

    The body's reduced ability to respond to the effects of insulin.

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    Treatment Goal for Diabetes

    To manage blood sugar levels and prevent complications.

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    Insulin-stimulated glucose transport

    Insulin signals the movement of GLUT-4 to the cell membrane, enhancing glucose uptake in skeletal muscle.

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    Insulin resistance in adipose tissue

    Adipose tissue, before skeletal muscle, becomes resistant to insulin's effects.

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    Excess lipids' effect on insulin signalling

    Excess lipids create reactive molecules (DAGs, ceramides) disrupting insulin's signalling pathways.

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    Diabetic ketoacidosis

    A serious complication of diabetes characterized by high blood sugar, ketone production, and metabolic acidosis.

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    Hyperglycemic hyperosmolar nonketotic syndrome

    A life-threatening complication of diabetes with extremely high blood sugar levels without significant ketone production.

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    Peripheral neuropathy (somatic)

    Nerve damage affecting the sensation and movement in the limbs due to diabetes.

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    Diabetic retinopathy

    Damage to blood vessels in the retina due to high blood sugar levels in diabetes.

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    A1C

    A measure of average blood sugar levels over the past 2-3 months.

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    A1C Blood Test

    A blood test measuring average blood sugar levels over the past 120 days

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    Blood Pressure Target

    Keep blood pressure below 130/80 mmHg

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    LDL Cholesterol Target

    Less than 2.0 mmol/L

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    Diabetes Exercise Recommendations (Type II)

    150+ minutes of moderate-to vigorous activity weekly, spread over at least 3 days; shorter vigorous or interval periods can suffice for some.

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    Type II Diabetic Hyperglycemia

    High blood sugar present in 13 of 24 hours in "well-controlled" diabetics

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    Insulin Decrease During Exercise

    Insulin levels decrease during exercise to help the body use stored glucose.

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    Common Diabetes Medications

    Metformin, rosiglitazone, sulfonylureas (like glyburide and glipizide) and insulin

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    Diabetes Treatment Components

    Diet, medication (insulin and oral glucose lowering), exercise, to control blood sugar and related conditions

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    Exercise-stimulated glucose transport

    Exercise increases glucose uptake by skeletal muscle, independently of insulin sensitivity.

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    GLUT-4 translocation

    Exercise moves GLUT-4 glucose transporters from inside muscle cells to the cell membrane, facilitating glucose uptake.

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    IMTG (Intramuscular Triglycerides)

    Stored fat inside muscle cells.

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    Athlete's Paradox

    Regularly exercising individuals can have high IMTG levels while maintaining acute insulin sensitivity.

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    Exercise and Insulin Sensitivity

    A single exercise session can significantly improve insulin sensitivity, even in obese individuals.

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    Exercise and IMTG Synthesis

    Exercise increases the storage of IMTG (intra-muscular triglycerides) especially when fat availability is high.

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    Exercise and Fatty Acid Metabolism

    Exercise may redirect fatty acid use, reducing potentially harmful metabolites for insulin sensitivity.

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    Exercise and Lipogenic Enzymes (DGAT1 / mGPAT)

    Exercise might increase the expression of the lipogenic enzymes involved in converting fatty acids to fat.

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    Hyperglycemia in Diabetics

    Even in 'well-controlled' type 2 diabetics, high blood sugar can occur for a significant portion of the day (13 out of 24 hours).

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    Acute Exercise & Blood Glucose

    Short bursts of physical activity can effectively reduce blood glucose levels in diabetic individuals for a sustained period.

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    GLUT-4 Translocation in Diabetes

    Despite insulin resistance, the movement of GLUT-4 to the cell membrane, stimulated by exercise, remains functional in type 2 diabetes.

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    How Exercise Bypasses Insulin Resistance

    Exercise can overcome the resistance to insulin's effects by promoting glucose uptake through mechanisms independent of insulin.

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    Lipid-Induced Insulin Resistance

    長時間の脂肪酸の注入はインスリン抵抗性を引き起こします。

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    Exercise Prevents Lipid-Induced Insulin Resistance

    Acute exercise intervention can prevent the development of insulin resistance caused by prolonged exposure to high levels of fatty acids.

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    Reactive Lipids & Exercise

    Exercise reduces the formation of harmful reactive lipids and promotes proper storage of fats, preventing insulin resistance.

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    Exercise's Double Action

    Exercise can boost glucose uptake into muscle cells directly, independently of insulin, and indirectly by improving insulin sensitivity.

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    Insulin Resistance Bypass

    Exercise can overcome insulin resistance, allowing glucose to enter muscle cells even when the body isn't responding well to insulin.

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    Acute vs. Chronic Exercise

    Both short-term (acute) and long-term (chronic) exercise benefit glucose control, but chronic exercise has lasting effects.

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    Lipid's Role in Insulin Resistance

    Excess lipids can interfere with insulin's signaling pathways, leading to insulin resistance and high blood sugar.

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    Exercise and Lipids

    Exercise can reduce harmful lipids and promote proper lipid storage, improving insulin sensitivity and glucose control.

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    Combined Benefits

    Combining aerobic and resistance training offers even greater benefits for glucose control and overall health in diabetes.

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    Exercise Prescription

    Tailoring an exercise program for diabetics considers individual needs and goals for better glucose control, preventing complications, and improving cardiovascular health.

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    Study Notes

    Module 3: Cardiovascular Exercise Principles, Week 3

    • Module focuses on exercise prescription for common chronic conditions, specifically diabetes.
    • Learning goals include defining diabetes, identifying physiological processes in regulating blood glucose, the treatment goal for diabetes, complications of exercise, and effective exercise strategies for type 2 diabetes management.

    Diabetes

    • A chronic metabolic disease characterized by hyperglycemia due to insulin secretion defects or insulin utilization issues.
    • Types include:
      • Type 1: autoimmune disease in children and adults, causing pancreas beta cell destruction and halting insulin production.
      • Type 2: metabolic disease caused by insulin resistance in peripheral tissue and defective insulin secretion.

    Learning Objectives

    • Define diabetes.
    • Identify physiological processes involved in blood glucose regulation and factors contributing to high blood glucose in type 2 diabetics.
    • Clarify the treatment goal of diabetes and justify exercise's role in acute and chronic management.
    • Detail complications arising from exercise in diabetics.
    • Design effective exercise strategies for type 2 diabetes management.

    Blood Glucose Control

    • Blood glucose control is impaired in type 2 diabetics.
    • 24-hour blood glucose control is discussed in Van Dijk et al. (Diabetes Journal 2015; 28:24-30).

    Glucose Transport in Skeletal Muscle

    • Glucose, blood, insulin, exercise, cytosol, GLUT-4, vesicle are key components in the process of transportation within skeletal muscle.
    • Highlighting the insulin-stimulated or exercise-stimulated movement of glucose into skeletal muscle for glucose transport enhancement.
    • Notably, insulin binding to its receptor on target tissues, particularly skeletal muscle, plays a significant role in facilitating glucose uptake, accounting for 50-80% of insulin-stimulated glucose uptake, impacting 40% of body mass.

    Pathophysiology of Insulin Resistance

    • Adipose tissue (AT) becomes insulin-resistant before skeletal muscle.
    • Key contributors to insulin resistance in AT include adipocyte hypertrophy, inflammation, reactive oxygen species (ROS) emission, and lipolysis.
    • Elevated fatty acid release from adipose tissue and accumulation in skeletal muscle are linked to this phenomenon.
    • Excessive lipid accumulation negatively impacts insulin signaling.
    • Accumulation of reactive lipids, such as diacylglycerols (DAGs) and ceramides, is implicated in disrupting insulin signaling.

    Diabetic Complications

    • Acute complications include hyperglycemia (manifestations) and hypoglycemia (potential causes) encompassing diabetic ketoacidosis and hyperosmolar nonketotic syndrome.
    • Chronic complications include peripheral neuropathies (somatic and autonomic), nephropathies, retinopathies, macro/microvascular complications, diabetic foot ulcers and infections.

    Exercise Prescription for Diabetes

    • Treatment goals include diet (when and what to eat), medication, and regular exercise.
    • Patients with diabetes should aim for an A1C of 7% or less. Maintain blood pressure at levels below 130/80 mmHg and LDL cholesterol below 2.0 mmol/L.
    • 150+ minutes of moderate-to-vigorous intensity aerobic activity per week, spread across at least three non-consecutive exercise days, are usually recommended. Shorter, more intense sessions might be sufficient for younger and more physically fit individuals.

    Chronic Exercise Training Benefits

    • Chronic aerobic exercise improves insulin action and blood glucose control.
    • Chronic aerobic exercise promotes improved cardiovascular and metabolic fitness.
    • Improvements in cardiovascular fitness, reduction of risk factors (obesity, hypertension, and high blood cholesterol), and progression of diabetes are other key benefits of exercise.

    Glucose Control During and After Exercise

    • Glucose control during and after exercise is essential and highlights that insulin and counter-regulatory hormones do not respond uniformly in diabetics compared to non-diabetics.
    • Diabetic individuals may experience acute exercise-induced hypoglycemia lasting up to 48 hours post-exercise.
    • Monitoring blood glucose levels is crucial to prevent hyperglycemia and hypoglycemia.

    Contraindications for Exercise in Diabetes

    • Exercise is contraindicated when blood glucose is excessively high (>14 mmol/L) in the presence of ketones, or low (<4 mmol/L) without an adequate carbohydrate intake to avoid hypoglycemia before activity.
    • In diabetics with retinopathy or hypertension, high-intensity activities, including activities involving Valsalva maneuvers, should be avoided and light weight with low contraction velocity for resistance training is instead recommended.
    • Special precautions are needed for those with peripheral neuropathy due to the risk of ulcers and fracture. Special shoes or padding are recommended.

    General Exercise Prescription for Diabetes

    • Prescriptions must be personalized based on medication schedules, the severity of diabetes complications, and the expected exercise benefits.
    • Diabetic individuals should include endurance and resistance exercises to develop and maintain cardiorespiratory fitness, body composition, and muscular strength and endurance.
    • Food intake must be considered for individuals on medication that can affect blood glucose levels or those who are engaging in vigorous training lasting over an hour.

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    Description

    This quiz covers cardiovascular exercise principles related to diabetes management. Students will learn to define diabetes, understand physiological processes that regulate blood glucose, and develop effective exercise strategies for type 2 diabetes. Master the complications of exercise and the treatment goals to manage this chronic condition.

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