TY - JOUR
T1 - Long-lasting effect of training on insulin responsiveness in the rat
AU - Nagasawa, J.
AU - Muraoka, I.
AU - Sato, I.
PY - 1995/3/20
Y1 - 1995/3/20
N2 - In vivo insulin sensitivity and responsiveness were assessed in rats one day (Day 1), seven days (Day 7), and 3 weeks (Day 21) after cessation of training, using a 2-stage sequential hyperinsulinemic euglycemic clamp technique (insulin infusion rate: 4.4 mU.kg-1 min-1 and 26.4 mU.kg-1.min-1). The day after the last bout of exercise, the glucose infusion rate (GIR-L: 4.4 mU-dose), which is an index of insulin sensitivity, was significantly higher in the trained group (11.5 ± 1.1 mg.kg-1.min-1) than in the control group (6.1 + 0.6mg.kg-1.min-1; p<0.01). Detraining decreased GIR-L significantly, to 7.4 ± 0.5 (Day 7: p<0.01) and 7.4 ± 0.5 mg.kg-1.min-1 (Day 21: p < 0.05). Insulin responsiveness, assessed by response to a 26.4 mU-dose of insulin (GIR-H), was also increased by training, from 21.8 ± 1.2 mg.kg-1.min-1 (control) to 32.9 ± 1.2 (Day 1, p < 0.01). Seven days after cessation of training period the level was nearly identical (33.4 ± 1.0 mg.kg-1.min-1) and remained high 3 weeks after training (30.8 ± 1.0: p<0.01, vs control). These data indicate that insulin responsiveness remains elevated for 3 weeks after training, although insulin sensitivity is reversed within seven days. These results may be attributed to changes in body composition or long-lasting changes in post-receptor mechanisms.
AB - In vivo insulin sensitivity and responsiveness were assessed in rats one day (Day 1), seven days (Day 7), and 3 weeks (Day 21) after cessation of training, using a 2-stage sequential hyperinsulinemic euglycemic clamp technique (insulin infusion rate: 4.4 mU.kg-1 min-1 and 26.4 mU.kg-1.min-1). The day after the last bout of exercise, the glucose infusion rate (GIR-L: 4.4 mU-dose), which is an index of insulin sensitivity, was significantly higher in the trained group (11.5 ± 1.1 mg.kg-1.min-1) than in the control group (6.1 + 0.6mg.kg-1.min-1; p<0.01). Detraining decreased GIR-L significantly, to 7.4 ± 0.5 (Day 7: p<0.01) and 7.4 ± 0.5 mg.kg-1.min-1 (Day 21: p < 0.05). Insulin responsiveness, assessed by response to a 26.4 mU-dose of insulin (GIR-H), was also increased by training, from 21.8 ± 1.2 mg.kg-1.min-1 (control) to 32.9 ± 1.2 (Day 1, p < 0.01). Seven days after cessation of training period the level was nearly identical (33.4 ± 1.0 mg.kg-1.min-1) and remained high 3 weeks after training (30.8 ± 1.0: p<0.01, vs control). These data indicate that insulin responsiveness remains elevated for 3 weeks after training, although insulin sensitivity is reversed within seven days. These results may be attributed to changes in body composition or long-lasting changes in post-receptor mechanisms.
KW - Detraining
KW - Insulin responsiveness
KW - Training effect
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U2 - 10.1055/s-2007-972971
DO - 10.1055/s-2007-972971
M3 - Article
C2 - 7751083
AN - SCOPUS:0028930239
VL - 16
SP - 91
EP - 93
JO - International Journal of Sports Medicine
JF - International Journal of Sports Medicine
SN - 0172-4622
IS - 2
ER -