DiabetesEx-ACSM.ppt

Exercise and Type 2 Diabetes Medicine & Science in Sports & Exercise Volume 32(7) July 2000 pp 1345-1360

Diabetes
Type 1
Insulin dependent diabetes mellitus (IDDM)
Juvenile
Type 2
Non- Insulin dependent diabetes mellitus (NIDDM
Adult onset (less so recently)
Gestational (temporary)
Secondary (pancreatitis, etc.)

Criteria
Fasting plasma glucose greater than 126.
Symptoms such as polyuria, polydipsia, and unexplained weight loss with plasma glucose over 200.
2-hour plasma glucose greater than 200 during an oral glucose tolerance test

What is HbA1C?
Glucose sticks to the hemoglobin to make a 'glycosylated hemoglobin', called hemoglobin A1C or HbA1C. The more glucose in the blood, the more hemoglobin A1C or HbA1C will be present in the blood.
Red cells live for 8 -12 weeks before they are replaced. By measuring the HbA1C it can tell you how high your blood glucose has been on average over the last 8-12 weeks. A normal non-diabetic HbA1C is 3.5-5.5% (this varies between hospitals). In diabetes 4-6% is acceptable.
The HbA1C test is currently one of the best ways to check diabetes is under control; it is the blood test that gets sent to the laboratory, and it is done on the spot in some hospital clinics. Remember, the HbA1C is not the same as the glucose level.

Glucose Uptake
Normal glucose uptake
Insulin
GLUT-1 and GLUT-4
Effective transport
Glucose uptake in diabetes
Insulin (Type I)
GLUT-1 and GLUT-4 (Type II)
Defective transport

Factors
Genetic influence
not well understood
Environmental
age
obesity
fat distribution
ethnicity
family history
low socioeconomic status
physical inactivity
diet
number of children born

Pathophysiology
Insulin resistance (or action)
GLUT-4 proteins
Insulin receptor substrate
Insulin secretion (or deficiency)
Causes:
genetics
chronic hyperglycemia
high fatty acid levels

Pathophysiology
Insulin resistance
Defective insulin receptors
Defective GLUT-4
Insulin deficiency

Hyperglycemia
Damage to capillaries
Increase clot formation
Nerve damage
Associated with other diseases

Treatment
Goal: achieve optimal glucose and fatty-acid levels
Exercise
improves insulin sensitivity
improves lipid levels and hypertension
Medication

Acute Effects of Exercise
Blood glucose levels?
Decrease
Increase if the exercise is at a high intensity level
Causes?
Increase in muscle glucose uptake
Decrease in hepatic glucose production

Acute Effects of Exercise
Insulin resistance
Some, but not all studies, show an increase in insulin sensitivity.
How long?
12-24 hours
Recommendations
Regular activity performed at low-to-moderate intensity is recommended

Chronic Effects
Type 2 diabetics: low functional capacity
Regular exercise causes typical physiological changes including those that help prevent CVD

Hypertension
60% of people with type 2 diabetes

Metabolic Control
Aerobic exercise improves glucose tolerance and HBAC1 levels
Less effects in older patients
Effects show in as little as 7 days
Frequency of exercise is key
Inverse relationship between physical activity and mortality from type 2 diabetes
Exercise may help improve glucose disposal

Lipids and Lipoproteins
Exercise may improves lipid profile of type 2 diabetics, slow down atherosclerosis, and related mortality
Triglycerides
Total cholesterol
HDL:TC ratio
Some studies show no effect
Weight loss may be more important than exercise for improving lipid levels.

Weight Loss
Moderate weight loss (10-15% of 4.5-9.1 kg) has positive effect
Nutrition and exercise are most effective
Exercise mobilizes upper body fat
Loss of visceral fat may improve metabolic control
Exercise levels needed for weight loss are difficult in type 2 diabetics

Psychological Issues

Physical Activity
As physical activity decreases in societies, type 2 diabetes increases
Groups of people with type 2 diabetes are typically less active and/or have higher glucose and insulin levels
Physical fitness may provided some protection against type 2 diabetes
Physical activity plays a major role in treating type 2 diabetes

Physical Activity
Frequency:
3 non-consecutive days up to 5 days a week
Acute effects of exercise on glucose levels last up t 72 hours
Daily exercise will maximize weight loss
Intensity:
Low to moderate (40-70% VO2max)
Enhance adherence, injury, and foot trauma
Autonomic neuropathy affects HR response during exercise
RPE

Physical Activity
Duration
Initially 10-15 minutes per session
Minimum of 30 minutes per session
Three 10 minutes sessions per day
Optimal would be 60 minutes
Mode
Control of intensity, easily maintained, low skill, personal interests, safe, and maximize caloric expenditure
May need to be non-weight baring
Resistance training?

Physical Activity
Progression
Age, functional capacity, medical status, personal preferences, goals, etc.
Frequency and duration before intensity
Limitations
Drop out rate is high with type 2 diabetics
Low number of type I muscle fibers and low capillary density
Lower anaerobic threshold

Complications
Glucose uptake increases during exercise from 2-3 mg/kg/min with moderate exercise to 5-6 mg/kg/min with high intensity exercise.
Hypoglycemia is less likely with Type 2 patients.
Insulin injections
1 hour before exercise in non-exercising muscle
Self blood glucose monitoring is recommended

Long-term Complications
Macro- and microvascular complications can be made worse through exercise.
Physical exam before starting an exercise program

Complications
The risk of cardiovascular disease is 50% and 150% greater in men and women, respectively, with type 2.
If autonomic neuropathy is present…?
Low-level daily activities and perhaps non-weight bearing.
If peripheral neuropathy?
Non-weight baring
If nephrophathy…
Avoid blood pressure > 180 mm Hg
If retinopathy…
Limit BP increases to 20-30 mm Hg and avoid head down activities, jarring activities and activities where the arms are over the head.

Maintenance of Exercise
Transtheoretical model
Contemplation stage: deals with benefits of exercise
Action stage: deals with exercise options
Ease of Access
Ease of Performance
Maintenance stage: deals with a proper exercise program
Self-efficacy theory

Conclusions
Physical activity affords significant acute and chronic benefits for those with type 2 diabetes.
The benefits of chronic physical activity are more numerous than those of acute physical activity, emphasizing the need for regular participation by those with type 2 diabetes and those at risk for this form of diabetes.
Unfortunately, physical activity is underutilized in the management of type 2 diabetes.
This may be due to lack of understanding and/or motivation on the part of the person with diabetes and lack of clear recommendations, encouragement, and follow-up by health care professionals.

Conclusions
Several factors including muscle fiber composition, low capillary density, obesity, and older age require that physical activity be initiated at lower intensity/duration and be increased gradually to reduce risks and contribute to maintenance of physical activity by those with type 2 diabetes.
Attention to the patient's stage of readiness and factors that will encourage adoption and maintenance of regular physical activity are extremely important for successful use of physical activity as a therapeutic intervention.
Health care professionals must address physical activity more seriously in this patient population because most people with type 2 diabetes have the potential to derive benefits from regular, moderate levels of physical activity.

Exercise and Prevention of Type 2 Diabetes
6% decrease for every 500 kcals/week
Other evidence
Inactivity and sedentary lifestyle
Da Qing study (Pan, et al. 1997)
Controls 68% increase in Type 2
Diet 44%
Diet plus exercise 46%
Exercise 41%

Kohl HW ; Gordon NF ; Villegas JA ; Blair SN Cardiorespiratory fitness, glycemic status, and mortality risk in men Diabetes Care 1992 Feb; 15(2): 184-92
OBJECTIVE--To determine the association of baseline cardiorespiratory fitness to all-cause mortality across the range of blood glucose levels.
RESEARCH DESIGN AND METHODS--Data from a prospective study of 8715 men (average age 42 yr), followed for an average of 8.2 yr (range 1-15 yr), were analyzed. Cardiorespiratory fitness was assessed by maximal-exercise treadmill testing. Men with evidence of clinical vascular disease or who did not achieve 85% of their age-predicted maximum heart rate during exercise testing were excluded from analyses.
RESULTS--Age-adjusted death rates increased with higher levels, of fasting blood glucose. Regardless of glycemic status, fit men had lower age-adjusted all-cause death rates than their less fit counterparts. For men with fasting blood glucose greater than or equal to 7.8 mM or physician-diagnosed non-insulin-dependent diabetes mellitus (NIDDM), the age-adjusted death rates per 10,000 person-yr of follow-up in unfit and fit subjects were 82.5 and 45.9, respectively. The age-adjusted relative risk of death due to all causes was significantly elevated in the lower-fitness group within each of three glycemic status levels: fasting blood glucose less than 6.4 mM; relative risk (RR) = 1.93 (95% confidence interval [95% CI] 1.15-3.26); fasting blood glucose 6.4-7.8 mM; RR = 3.42 (95% CI 2.27-5.15); and fasting blood glucose greater than or equal to 7.8 mM or with NIDDM, RR = 1.80 (95% CI = 1.25-2.58). Multivariate analyses, controlling for risk factors of mortality (age, resting systolic blood pressure, serum cholesterol, body mass index, family history of heart disease, follow-up interval, and smoking habit) showed a higher risk of death due to all causes for unfit compared with fit men. Multivariate risks of death associated with low fitness, compared with higher fitness (RR), in the three glycemic status groups were: fasting blood glucose less than 6.4 mM, RR = 1.38 (95% CI 1.09-1.74); fasting blood glucose 6.4-7.8 mM, RR = 1.61 (95% CI 0.91-2.86); and fasting blood glucose greater than or equal to 7.8 mM or with NIDDM, RR = 1.92 (95% CI 0.75-4.90).

Pan, X.R. et al. Effects of diet and exercise in preventing NIDDM in people with impaired glucose tolerance. The Da Qing IGT and Diabetes Study. Diabetes Care 1997 Apr; 20(4): 537-44
OBJECTIVE: Individuals with impaired glucose tolerance (IGT) have a high risk of developing NIDDM. The purpose of this study was to determine whether diet and exercise interventions in those with IGT may delay the development of NIDDM, i.e., reduce the incidence of NIDDM, and thereby reduce the overall incidence of diabetic complications, such as cardiovascular, renal, and retinal disease, and the excess mortality attributable to these complications.
RESEARCH DESIGN AND METHODS: In 1986, 110,660 men and women from 33 health care clinics in the city of Da Qing, China, were screened for IGT and NIDDM. Of these individuals, 577 were classified (using World Health Organization criteria) as having IGT. Subjects were randomized by clinic into a clinical trial, either to a control group or to one of three active treatment groups: diet only, exercise only, or diet plus exercise. Follow-up evaluation examinations were conducted at 2-year intervals over a 6-year period to identify subjects who developed NIDDM. Cox's proportional hazard analysis was used to determine if the incidence of NIDDM varied by treatment assignment.
RESULTS: The cumulative incidence of diabetes at 6 years was 67.7% (95% CI, 59.8-75.2) in the control group compared with 43.8% (95% CI, 35.5-52.3) in the diet group, 41.1% (95% CI, 33.4-49.4) in the exercise group, and 46.0% (95% CI, 37.3-54.7) in the diet-plus-exercise group (P < 0.05). When analyzed by clinic, each of the active intervention groups differed significantly from the control clinics (P < 0.05). The relative decrease in rate of development of diabetes in the active treatment groups was similar when subjects were stratified as lean or overweight (BMI < or > or = 25 kg/m2). In a proportional hazards analysis adjusted for differences in baseline BMI and fasting glucose, the diet, exercise, and diet-plus-exercise interventions were associated with 31% (P < 0.03), 46% (P < 0.0005), and 42% (P < 0.005) reductions in risk of developing diabetes, respectively.
CONCLUSIONS: Diet and/or exercise interventions led to a significant decrease in the incidence of diabetes over a 6-year period among those with IGT.

DiabetesEx-ACSM.ppt

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