Exercise and diet reduce muscle insulin resistance in obese Zucker rat

1986 ◽  
Vol 251 (3) ◽  
pp. E299-E305 ◽  
Author(s):  
J. L. Ivy ◽  
W. M. Sherman ◽  
C. L. Cutler ◽  
A. L. Katz
Keyword(s):  
Insulin Resistance ◽  
Exercise Training ◽  
Glucose Uptake ◽  
High Fat Diet ◽  
High Carbohydrate Diet ◽  
Carbohydrate Diet ◽  
Muscle Insulin Resistance ◽  
High Carbohydrate ◽  
Obese Zucker Rat ◽  
Obese Rats

Two treatments that increase skeletal muscle insulin action are exercise training and high-carbohydrate diet. The purpose of the present study was to determine whether exercise training and a diet high in carbohydrates could function synergistically to reduce the muscle insulin resistance in the obese Zucker rat. Obese rats 4 wk of age were randomly assigned to an exercise or sedentary group. Each group was subdivided by diet with one-half of the rats fed a high-carbohydrate diet and one-half fed a high-fat diet. Lean Zucker rats fed the high-fat diet were used as controls. Muscle insulin resistance was assessed during hindlimb perfusion with a submaximally stimulating concentration of insulin. Exercise training and the high-carbohydrate diet increased the rate of muscle glucose uptake in the obese rat by 46 and 53%, respectively. More importantly, the combined effect of exercise training and high-carbohydrate diet was greater than the sum of their individual effects. Glycogen synthesis paralleled glucose uptake and was the major pathway for intracellular glucose disposal. Muscle glucose uptake for exercise-trained, high-carbohydrate fed obese rats was comparable with that of lean controls. It is concluded that exercise training and the high-carbohydrate diet functioned synergistically to reduce the muscle insulin resistance in the obese rat.

Muscle glucose uptake of obese Zucker rats trained at two different intensities

1991 ◽  
Vol 70 (1) ◽  
pp. 36-42 ◽  
Author(s):  
M. E. Willems ◽  
J. T. Brozinick ◽  
C. E. Torgan ◽  
M. Y. Cortez ◽  
J. L. Ivy
Keyword(s):  
Insulin Resistance ◽  
Exercise Training ◽  
Glucose Uptake ◽  
Exercise Bout ◽  
Zucker Rats ◽  
Muscle Insulin Resistance ◽  
Obese Zucker Rat ◽  
Training Response ◽  
Obese Zucker Rats ◽  
The Difference

Exercise training reduces the muscle insulin resistance of the obese Zucker rat. The purpose of the present study was to determine whether the magnitude of this training response is exercise intensity specific. Obese Zucker rats were randomly divided into sedentary (SED), low-intensity (LI), and high-intensity (HI) exercise groups. For the LI rats, exercise training consisted of running on a rodent treadmill at 18 m/min up an 8% grade for 90 min. Rats in the HI group ran at 24 m/min up an 8% grade for four 17-min bouts with 3 min between bouts. Both exercise groups performed the same amount of work and trained 5 days/wk for 7 wk. To evaluate muscle insulin resistance, rat hindlimbs were perfused for 30 min with perfusate containing 6 mM glucose (0.15 mu Ci of D-[14C(U)] glucose/ml) and either a maximal (10.0 mU/ml) or a submaximal (0.50 mU/ml) insulin concentration. Perfusions were performed 48–56 h after the last exercise bout and a 12-h fast. In the presence of 0.5 mU/ml insulin, the rate of muscle glucose uptake was found to be significantly faster for the HI (9.56 +/- 0.66 mumol.h-1.g-1) than for the LI (7.72 +/- 0.65 mumol.h-1.g-1) and SED (6.64 +/- 0.44 mumol.h-1.g-1) rats. The difference in glucose uptake between the LI and SED rats was not significant. In the presence of 10.0 mU/ml insulin, the rate of glucose uptake was significantly faster for the HI (16.43 +/- 1.02 mumol.h-1.g-1) than for the LI rats (13.76 +/- 0.84 mumol.h-1.g-1) and significantly faster for the LI than for the SED rats (11.02 +/- 0.35 mumol.h-1.g-1).(ABSTRACT TRUNCATED AT 250 WORDS)

scholarly journals Biochemical aspects of malabsorption in marasmus: effect of dietary rehabilitation

1985 ◽  
Vol 54 (3) ◽  
pp. 567-575 ◽  
Author(s):  
H. C. Mehta ◽  
A. S. Saini ◽  
Harjit Singh ◽  
P. S. Dhatt
Keyword(s):  
Total Energy ◽  
High Fat Diet ◽  
High Protein Diet ◽  
High Carbohydrate Diet ◽  
High Protein ◽  
Protein Diet ◽  
Duodenal Juice ◽  
High Fat ◽  
Carbohydrate Diet ◽  
High Carbohydrate

1. Sixty marasmic children were investigated for the absorption of xylose, proteins and fats. Their duodenal juice samples were also analysed for bile salts and microflora.2. The marasmic children were then studied in three groups of twenty by allocating them to three different dietary schedules: a high-protein diet (30% of the total energy from protein), a high-fat diet (40% of the total energy from fat) and a high-carbohydrate diet (70% of the total energy from carbohydrate) for 2 weeks and the previous measurements repeated.3. Whereas the high-fat diet resulted in improved fat absorption, along with an increase in total and conjugated bile acids, and the high-carbohydrate diet led to improved xylose absorption, the diet rich in protein resulted in an improvement in the absorption of all three dietary ingredients. It appears that a high-protein diet improves the overall absorption process by improving the intestinal environment as a whole, while high-carbohydrate and high-fat diets bring about adaptive changes related to the respective absorptive processes.

Skeletal muscle glucose transport in obese Zucker rats after exercise training

1989 ◽  
Vol 66 (6) ◽  
pp. 2635-2641 ◽  
Author(s):  
J. L. Ivy ◽  
J. T. Brozinick ◽  
C. E. Torgan ◽  
G. M. Kastello
Keyword(s):  
Insulin Resistance ◽  
Glucose Transport ◽  
Transport Process ◽  
Fiber Type ◽  
Zucker Rat ◽  
Muscle Insulin Resistance ◽  
Obese Zucker Rat ◽  
Obese Rats ◽  
Muscle Glucose Transport ◽  
Fast Twitch

Exercise training has been found to reduce the muscle insulin resistance of the obese Zucker rat (fa/fa). The purpose of the present study was to determine whether this reduction in muscle insulin resistance was associated with an improvement in the glucose transport process and if it was fiber-type specific. Rats were randomly assigned to a sedentary or training group. Training consisted of treadmill running at 18 m/min up an 8% grade, 1.5 h/day, 5 days/wk, for 6–8 wk. The rate of muscle glucose transport was assessed in the absence of insulin and in the presence of a physiological (0.15 mU/ml), a submaximal (1.50 mU/ml), and a maximal (15.0 mU/ml) insulin concentration by determining the rate of 3-O-methyl-D-glucose (3-OMG) accumulation during hindlimb perfusion. The average 3-OMG transport rate of the red gastrocnemii (fast-twitch oxidative-glycolytic fibers) was significantly higher in the trained compared with the sedentary obese rats in the absence of insulin and in the presence of the three insulin concentrations. Significant improvements in 3-OMG transport were also observed in the plantarii (mixed fibers) of trained obese rats in the presence of 0, 0.15, and 15.0 mU/ml insulin. Training appeared to have little effect on the insulin-stimulated 3-OMG transport of the soleus (slow-twitch oxidative fibers) or white gastrocnemius (fast-twitch glycolytic fibers). The results suggest that the improvement in the muscle insulin resistance of the obese Zucker rat after moderate endurance training was associated with an improvement in the glucose transport process but that it was fiber-type specific.

Long-term abuse of a high-carbohydrate diet is as harmful as a high-fat diet for development and progression of liver injury in a mouse model of NAFLD/NASH

Nutrition ◽  
2020 ◽  
Vol 75-76 ◽  
pp. 110782 ◽  
Author(s):  
Simona Pompili ◽  
Antonella Vetuschi ◽  
Eugenio Gaudio ◽  
Alessandra Tessitore ◽  
Roberta Capelli ◽  
...  
Keyword(s):  
Liver Injury ◽  
Mouse Model ◽  
High Fat Diet ◽  
High Carbohydrate Diet ◽  
High Fat ◽  
Carbohydrate Diet ◽  
High Carbohydrate

scholarly journals Liver Fatty Acid Composition and Inflammation in Mice Fed with High-Carbohydrate Diet or High-Fat Diet

Nutrients ◽  
2016 ◽  
Vol 8 (11) ◽  
pp. 682 ◽  
Author(s):  
Lorena da Silva-Santi ◽  
Marina Antunes ◽  
Silvana Caparroz-Assef ◽  
Fabiana Carbonera ◽  
Laureane Masi ◽  
...  
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
High Fat Diet ◽  
High Carbohydrate Diet ◽  
Liver Fatty Acid ◽  
High Fat ◽  
Carbohydrate Diet ◽  
High Carbohydrate

scholarly journals CHEMICAL STUDIES ON INTESTINAL INFANTILISM

1912 ◽  
Vol 15 (2) ◽  
pp. 107-112 ◽  
Author(s):  
Francis H. McCrudden
Keyword(s):  
Uric Acid ◽  
High Fat Diet ◽  
High Carbohydrate Diet ◽  
High Fat ◽  
Carbohydrate Diet ◽  
High Carbohydrate ◽  
Chemical Studies

In my three cases of intestinal infantilism, the kreatinin excretion was more irregular than normally, and the kreatinin coefficient was low. Kreatin was found in the urine on a kreatin-free diet. The sum of kreatinin and kreatin was also irregular. The endogenous uric acid was irregular from day to day. The kreatin excretion is apparently lower on a high fat diet than on a high carbohydrate diet.

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