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Tytuł oryginału: Effect of different muscle shortening velocities during prolonged incremental cycling exercise on the plasma growth hormone, insulin, glucose, glucagon, cortisol, leptin and lactate concentrations.
Autorzy: Żołądź J. A., Duda K., Konturek S[tanisław] J., Śliwowski Z., Pawlik T., Majerczak J.
Źródło: J. Physiol. Pharmacol. 2002: 53 (3) s.409-422, il., bibliogr. 33 poz.
Sygnatura GBL: 302,092

Hasła klasyfikacyjne GBL:
  • endokrynologia

    Typ dokumentu:
  • tytuł obcojęzyczny
  • praca kliniczna
  • praca doświadczalna

    Wskaźnik treści:
  • ludzie
  • dorośli 19-44 r.ż.

    Streszczenie angielskie: 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 experimet 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 ń SD: age 22.9 ń 2.4 years; body mass 71.9 ń 8.2 kg; height 178 ń 6 cm; with VO2max of 3.896 ń 0.544 1 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 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 p.c. ogf the VO2max. Results and conclusions: We have found that choosing slow or fast pedaliing rates (60 or 120 rey 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 ...


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    Tytuł oryginału: MyHC II content in the vastus lateralis m. quadricipitis femoris is positively correlated with the magnitude of the non-linear increase in the VO2/power output relationship in humans.
    Autorzy: Żołądź J[erzy] A., Duda K., Karasiński J., Majerczak J., Kołodziejski L., Korzeniewski B.
    Źródło: J. Physiol. Pharmacol. 2002: 53 (4 p. 2) s.805-821, il., tab., bibliogr. 33 poz.
    Sygnatura GBL: 302,092

    Typ dokumentu:
  • praca kliniczna
  • praca doświadczalna
  • tytuł obcojęzyczny

    Wskaźnik treści:
  • ludzie
  • dorośli 19-44 r.ż.
  • płeć męska

    Streszczenie angielskie: In the study we have examined the relationship between the content of different isoforms of MyHC in the vastus lateralis. m. quadricipitis femoris and the VO2/power output relationship during incremental cycling exercise. Twenty-one male subjects: aged 24.0 ń 2.5 years, body mass 73.0 ń 7.2 kg, height 179 ń 5 cm, BMI 22.78 ń 1.84 kg ú m-2, VO2max 3697 ń 390 ml ú min-1, 50.9 ń 5.2 ml ú kg-1 ú min-1, participated in this experiment. The subjects performed an incremental exercise test unit exhaustion. The wxercise test started at power output of 30 W, followed by an increase amounting to 30 W every 3 minutes. The pedalling rate was maintained at 60 rev min-1. Gas exchange variables were measured continuously using breath-by-breath system Oxycon Jaeger. At the end of each step blood samples were taken for lactate concentration. Muscle biopsy samples taken from the vastus lateralis m. quadricipitis femoris, using the Bergstrom needle, were analysed for the content of different MyHC (I, IIa, IIx) using SDS-PAGE and Western blotting. The pre-exercise VO2, as a mean value of six-minute measurements, expressed both in min-1, and in ml ú kg-1 ú min-1, was positively correlated with the content of MyHC II in the vastus lateralis (p 0.01). We have also found that the pre-exercise values of VO2 in the group of subjects with a high proportion of MyHC II (59.9 ń 11.2 p.c.) were significantly higher (p 0.02, when VO2, was expressed in ml ú min-1, and p 0.01 when VO2 was expressed in ml ú kg-1 ú min-1) than in the group with low content of MyHC II (27.5 ń 6.0 p.c.) in the vastus...

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