Tags

Type your tag names separated by a space and hit enter

Effect of different muscle shortening velocities during prolonged incremental cycling exercise on the plasma growth hormone, insulin, glucose, glucagon, cortisol, leptin and lactate concentrations.
J Physiol Pharmacol. 2002 Sep; 53(3):409-22.JP

Abstract

BACKGROUND

Strenuous exercise was reported to involve the alteration in the release of some "stress" hormones such as growth hormone (GH), cortisol, catecholamines and appropriate adjustment of energy metabolism but the relative contribution of these hormones to metabolic response, to cycling exercise performed at different muscle shortening velocities, has not been clarified.

AIMS

The purpose of this experiment was to assess the effect of applying different pedalling rates during a prolonged incremental cycling exercise test on the changes in the plasma levels of growth hormone, cortisol, insulin, glucagon and leptin in humans.

MATERIAL AND METHODS

Fifteen healthy non-smoking men (means +/- SD: age 22.9 +/- 2.4 years; body mass 71.9 +/- 8.2 kg; height 178 +/- 6 cm; with VO2max of 3.896 +/- 0.544 1 x min(-1), assessed in laboratory tests, were subjects in this study. The subjects performed in two different days a prolonged incremental exercise tests at two different pedalling rates, one of them at 60 and another at 120 rev x min(-1). During this tests the power output has increased by 30 W every 6 minutes. The tests were stopped when the subject reached about 70 % of the VO2max.

RESULTS AND CONCLUSIONS

We have found that choosing slow or fast pedalling rates (60 or 120 rev min(-1)), while generating the same external mechanical power output, had no effect on the pattern of changes in plasma cortisol, insulin, glucagon, glucose and leptin concentrations. But, generation of the same external mechanical power output at 120 rev min(-1) causes more stepper increase (p < 0.01) in the plasma growth hormone concentration [GH]pl and plasma lactate concentrations [La]pl when compared to that observed during cycling at 60 rev x min(-1). We have also found that the onset of a significant increase in [GH]pl during cycling at 60 rev x min(-1) was not accompanied by significant increase in [La]pl. While during cycling at 120 rev x min(-1) the onset of a significant increase in [La]pl occurred without increase in [GH]pl, but with continuation of exercise when plasma [La]pl increased, there was also a parallel rise in plasma [GH]pl, as reported before. This results indicates that the increase in [GH]pl during exercise is not closely related to the increase in [La]pl.

Authors+Show Affiliations

Department of Muscle Physiology, AWF-Kraków, Cracow, Poland.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

12369738

Citation

Zoladz, J A., et al. "Effect of Different Muscle Shortening Velocities During Prolonged Incremental Cycling Exercise On the Plasma Growth Hormone, Insulin, Glucose, Glucagon, Cortisol, Leptin and Lactate Concentrations." Journal of Physiology and Pharmacology : an Official Journal of the Polish Physiological Society, vol. 53, no. 3, 2002, pp. 409-22.
Zoladz JA, Duda K, Konturek SJ, et al. Effect of different muscle shortening velocities during prolonged incremental cycling exercise on the plasma growth hormone, insulin, glucose, glucagon, cortisol, leptin and lactate concentrations. J Physiol Pharmacol. 2002;53(3):409-22.
Zoladz, J. A., Duda, K., Konturek, S. J., Sliwowski, Z., Pawlik, T., & Majerczak, J. (2002). Effect of different muscle shortening velocities during prolonged incremental cycling exercise on the plasma growth hormone, insulin, glucose, glucagon, cortisol, leptin and lactate concentrations. Journal of Physiology and Pharmacology : an Official Journal of the Polish Physiological Society, 53(3), 409-22.
Zoladz JA, et al. Effect of Different Muscle Shortening Velocities During Prolonged Incremental Cycling Exercise On the Plasma Growth Hormone, Insulin, Glucose, Glucagon, Cortisol, Leptin and Lactate Concentrations. J Physiol Pharmacol. 2002;53(3):409-22. PubMed PMID: 12369738.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of different muscle shortening velocities during prolonged incremental cycling exercise on the plasma growth hormone, insulin, glucose, glucagon, cortisol, leptin and lactate concentrations. AU - Zoladz,J A, AU - Duda,K, AU - Konturek,S J, AU - Sliwowski,Z, AU - Pawlik,T, AU - Majerczak,J, PY - 2002/10/9/pubmed PY - 2003/3/28/medline PY - 2002/10/9/entrez SP - 409 EP - 22 JF - Journal of physiology and pharmacology : an official journal of the Polish Physiological Society JO - J. Physiol. Pharmacol. VL - 53 IS - 3 N2 - BACKGROUND: Strenuous exercise was reported to involve the alteration in the release of some "stress" hormones such as growth hormone (GH), cortisol, catecholamines and appropriate adjustment of energy metabolism but the relative contribution of these hormones to metabolic response, to cycling exercise performed at different muscle shortening velocities, has not been clarified. AIMS: The purpose of this experiment was to assess the effect of applying different pedalling rates during a prolonged incremental cycling exercise test on the changes in the plasma levels of growth hormone, cortisol, insulin, glucagon and leptin in humans. MATERIAL AND METHODS: Fifteen healthy non-smoking men (means +/- SD: age 22.9 +/- 2.4 years; body mass 71.9 +/- 8.2 kg; height 178 +/- 6 cm; with VO2max of 3.896 +/- 0.544 1 x min(-1), assessed in laboratory tests, were subjects in this study. The subjects performed in two different days a prolonged incremental exercise tests at two different pedalling rates, one of them at 60 and another at 120 rev x min(-1). During this tests the power output has increased by 30 W every 6 minutes. The tests were stopped when the subject reached about 70 % of the VO2max. RESULTS AND CONCLUSIONS: We have found that choosing slow or fast pedalling rates (60 or 120 rev min(-1)), while generating the same external mechanical power output, had no effect on the pattern of changes in plasma cortisol, insulin, glucagon, glucose and leptin concentrations. But, generation of the same external mechanical power output at 120 rev min(-1) causes more stepper increase (p < 0.01) in the plasma growth hormone concentration [GH]pl and plasma lactate concentrations [La]pl when compared to that observed during cycling at 60 rev x min(-1). We have also found that the onset of a significant increase in [GH]pl during cycling at 60 rev x min(-1) was not accompanied by significant increase in [La]pl. While during cycling at 120 rev x min(-1) the onset of a significant increase in [La]pl occurred without increase in [GH]pl, but with continuation of exercise when plasma [La]pl increased, there was also a parallel rise in plasma [GH]pl, as reported before. This results indicates that the increase in [GH]pl during exercise is not closely related to the increase in [La]pl. SN - 0867-5910 UR - https://www.unboundmedicine.com/medline/citation/12369738/Effect_of_different_muscle_shortening_velocities_during_prolonged_incremental_cycling_exercise_on_the_plasma_growth_hormone_insulin_glucose_glucagon_cortisol_leptin_and_lactate_concentrations_ L2 - http://www.jpp.krakow.pl/journal/archive/09_02/pdf/409_09_02_article.pdf DB - PRIME DP - Unbound Medicine ER -