Distinct effects of aerobic exercise training and weight loss on glucose homeostasis in obese sedentary men

1996 ◽  
Vol 81 (1) ◽  
pp. 318-325 ◽  
Author(s):  
D. R. Dengel ◽  
R. E. Pratley ◽  
J. M. Hagberg ◽  
E. M. Rogus ◽  
A. P. Goldberg
Keyword(s):  
Weight Loss ◽  
Glucose Metabolism ◽  
Exercise Training ◽  
Glucose Tolerance ◽  
Aerobic Exercise ◽  
Glucose Homeostasis ◽  
Insulin Response ◽  
Older Men ◽  
Aerobic Exercise Training ◽  
Oral Glucose

The decline in glucose homeostasis with aging may be due to the physical deconditioning and obesity that often develop with aging. The independent and combined effects of aerobic exercise training (AEX) and weight loss (WL) on glucose metabolism were studied in 47 nondiabetic sedentary older men. There were 14 men in a weekly behavioral modification/WL program, 10 in a 3 times/wk AEX program, 14 in an AEX+WL program, and 9 in the control (Con) group. The 10-mo intervention increased maximal oxygen consumption (VO2max) in both the AEX and AEX+WL groups [0.33 +/- 0.05 and 0.37 +/- 0.09 (SE) l/min, respectively], but VO2max did not significantly change in the WL (0.01 +/- 0.06 l/min) and Con groups (-0.04 +/- 0.05 l/min; P > 0.05). The AEX+WL and WL groups had comparable reductions in body weight (-8.5 +/- 0.9 and -8.8 +/- 1.2 kg, respectively) and percent fat (-5.5 +/- 0.7 and -5.9 +/- 1.1%, respectively) that were significantly greater than those in the Con and AEX groups. Oral glucose tolerance tests showed significant reductions in insulin responses in the AEX, WL, and AEX+WL groups, but the decrease in insulin response in the AEX+WL group was significantly greater than that in the other three groups. The glucose area decreased significantly in the WL and AEX+WL groups but did not change in the Con or AEX groups. There were significant increases in insulin-mediated glucose disposal rates as measured by the hyperinsulinemic (600 pmol.m-2.min-1) euglycemic clamps in the AEX and AEX+WL groups [1.66 +/- 0.50 and 1.76 +/- 0.41 mg.kg fat-free mass (FFM)-1.min-1, respectively] that were significantly greater than those in the WL (0.13 +/- 0.31 mg.kg FFM-1.min-1) and Con groups (-0.05 +/- 0.51 mg.kg FFM-1.min-1; n = 5). These data suggest that AEX and WL improve glucose metabolism through different mechanisms and that the combined intervention of AEX+WL is necessary to improve both glucose tolerance and insulin sensitivity in older men.

scholarly journals Reduction in Midthigh Low-Density Muscle with Aerobic Exercise Training and Weight Loss Impacts Glucose Tolerance in Older Men

2007 ◽  
Vol 92 (3) ◽  
pp. 880-886 ◽  
Author(s):  
Steven J. Prior ◽  
Lyndon J. Joseph ◽  
Josef Brandauer ◽  
Leslie I. Katzel ◽  
James M. Hagberg ◽  
...  
Keyword(s):  
Weight Loss ◽  
Exercise Training ◽  
Glucose Tolerance ◽  
Aerobic Exercise ◽  
Older Men ◽  
Aerobic Exercise Training ◽  
Low Density

Effect of exercise training and chronic glyburide treatment on glucose homeostasis in diabetic rats

1992 ◽  
Vol 72 (1) ◽  
pp. 143-148 ◽  
Author(s):  
L. J. Goodyear ◽  
M. F. Hirshman ◽  
E. D. Horton ◽  
E. S. Horton
Keyword(s):  
Skeletal Muscle ◽  
Exercise Training ◽  
Glucose Tolerance ◽  
Glucose Homeostasis ◽  
Plasma Glucose ◽  
Insulin Response ◽  
Diabetic Rats ◽  
Oral Glucose ◽  
Oral Glucose Tolerance ◽  
Glucose Clearance

Exercise training and sulfonylurea treatment, either individually or in combination, were evaluated for their effects on plasma glucose concentrations, oral glucose tolerance, and glucose clearance in the perfused hindquarter of diabetic rats. Female rats that were injected with streptozocin (45 mg/kg iv) and had plasma glucose concentrations between 11 and 25 mM were considered diabetic and divided into sedentary, glyburide-treated, exercise-trained, and glyburide-treated plus exercise-trained groups. The sedentary streptozocin-treated rats were severely diabetic, as indicated by elevated glucose concentrations, impaired insulin response during oral glucose tolerance tests, and lower rates of glucose clearance in hindlimb skeletal muscle. Neither 8 wk of exercise training nor 4 wk of glyburide treatment alone improved these parameters. In contrast, the diabetic rats that were both trained and treated with glyburide showed some improvement in glucose homeostasis, as evidenced by lower plasma glucose concentrations, an enhanced insulin response to an oral glucose load, and a decrease in the severity of skeletal muscle insulin resistance compared with the diabetic controls. These data suggest that glyburide treatment or exercise training alone does not alter glucose homeostasis in severely insulin-deficient diabetic rats; however, the combination of exercise training and glyburide treatment may interact to improve glucose homeostasis in these animals.

scholarly journals GLUCOSE METABOLISM AND INSULIN RESPONSE TO ORAL GLUCOSE TOLERANCE TEST (OGTT) IN PREPUBERTAL PATIENTS WITH TRANSFUSION DEPENDENT Β-THALASSEMIA (TDT): A LONG-TERM RETROSPECTIVE ANALYSIS

2021 ◽  
Vol 13 (1) ◽  
pp. e2021051
Author(s):  
Vincenzo De Sanctis ◽  
Ashraf Soliman ◽  
Ploutarchos Tzoulis ◽  
Shahina Daar ◽  
Salvatore Di Maio ◽  
...  
Keyword(s):  
Glucose Metabolism ◽  
Glucose Tolerance ◽  
Oral Glucose Tolerance Test ◽  
Glucose Homeostasis ◽  
Glucose Tolerance Test ◽  
Insulin Response ◽  
Tolerance Test ◽  
Oral Glucose ◽  
Insulinogenic Index ◽  
Oral Glucose Tolerance

  Background: Glucose dysregulation (GD), including prediabetes and diabetes mellitus (DM), is a common complication of transfusion dependent β-thalassemia (TDT) patients. The prevalence increases with age and magnitude of iron overload, affecting a significant proportion of patients. The development of GD is frequently asymptomatic and therefore an early diagnosis, according to the international guidelines, requires an annual oral glucose tolerance test (OGTT) in all TDT patients aged ten years or older.   Purpose: This retrospective study aims to evaluate the prevalence of GD in a homogenous population of prepubertal TDT patients and to enhance understanding of the pathogenesis and progression of glucose homeostasis in this group of patients.   Methods: A selected group of 28 TDT patients was followed for at least 10.3 years (range: 10.3 - 28.10 years) from prepubertal age (mean 11.0 ± standard deviation 1.1 years) to adulthood (28.7 ± 3.7 years). Glucose tolerance and insulin response to OGTT were assessed, and indices of β-cell function, insulin sensitivity and insulin secretion were calculated.   Results: At baseline, 18 TDT patients had normal glucose tolerance (NGT) and 10 isolated impaired fasting glycaemia (IFG), according to the American Diabetes Association (ADA) criteria. Compared to 18 prepubertal healthy controls (mean ± SD age: 10.9 ± 1.1 years), the fasting plasma glucose (FPG), basal insulin level and Homeostatic Model Assessment for Insulin Resistance (HOMA-IR) index were significantly higher in the group of TDT patients (p= 0.001, 0.01 and 0.012, respectively). At the last observation, 7/18 patients (38.8%) with NGT and 9/10 (90%) with IFG at baseline deteriorated; 3 female patients developed type 2 DM (1 from the NGT group and 2 from the IFG group). Compared to adult controls, TDT patients with NGT had a reduced oral disposition index (DI) (p= 0.006), but no significant difference in HOMA-IR and Matsuda index. Conversely, all insulin indices (HOMA-IR, MI and DI) but one [insulinogenic index (IGI)] were statistically different in TDT patients with GD compared to controls.   Conclusion: This study shows a spectrum of disturbances in glucose homeostasis among TDT patients and that prepubertal patients with IFG are at higher risk for developing a deterioration of glucose metabolism.  

scholarly journals DISTINCT EFFECTS OF AEROBIC EXERCISE TRAINING AND WEIGHT LOSS ON GLUCOSE HOMEOSTASIS IN OBESE SEDENTARY MEN 474

1996 ◽  
Vol 28 (Supplement) ◽  
pp. 80 ◽  
Author(s):  
D. R. Dengel ◽  
R. E. Pratley ◽  
J. M. Hagberg ◽  
E. M. Rogus ◽  
A. P. Goldberg
Keyword(s):  
Weight Loss ◽  
Exercise Training ◽  
Aerobic Exercise ◽  
Glucose Homeostasis ◽  
Aerobic Exercise Training

Effect of exercise training on glucose homeostasis in normal and insulin-deficient diabetic rats

1988 ◽  
Vol 65 (2) ◽  
pp. 844-851 ◽  
Author(s):  
L. J. Goodyear ◽  
M. F. Hirshman ◽  
S. M. Knutson ◽  
E. D. Horton ◽  
E. S. Horton
Keyword(s):  
Skeletal Muscle ◽  
Exercise Training ◽  
Glucose Tolerance ◽  
Glucose Uptake ◽  
Glucose Homeostasis ◽  
Plasma Glucose ◽  
Citrate Synthase ◽  
Diabetic Rats ◽  
Oral Glucose ◽  
Oral Glucose Tolerance

The effect of 8-wk of treadmill training on plasma glucose, insulin, and lipid concentrations, oral glucose tolerance, and glucose uptake in the perfused hindquarter of normal and streptozocin-treated, diabetic Sprague-Dawley rats was studied. Diabetic rats with initial plasma glucose concentrations of 200-450 mg/dl and control rats were divided into trained and sedentary subgroups. Training resulted in lower plasma free fatty acid concentrations and increased triceps muscle citrate synthase activity in both the control and diabetic rats; triglyceride concentrations were lowered by training only in the diabetic animals. Oral glucose tolerance and both basal and insulin-stimulated glucose uptake in hindquarter skeletal muscle were impaired in the diabetic rats, and plasma glucose concentrations (measured weekly) gradually increased during the experiment. Training did not improve the hyperglycemia, impaired glucose tolerance, or decreased skeletal muscle glucose uptake in the diabetic rats, nor did it alter these parameters in the normal control animals. In considering our results and those of previous studies in diabetic rats, we propose that exercise training may improve glucose homeostasis in animals with milder degrees of diabetes but fails to cause improvement in the more severely insulin-deficient, diabetic rat.

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