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Distinguishing the strength of hypoxic stimulus in intermittent hypoxia

100%

Sokolowska B., Jozwik A.

Journal of Physiology and Pharmacology. Supplement

2007

tom 58

nr 5

Age-related peculiarities of breathing regulation and antioxidant enzymes under intermittent hypoxic training

100%

Kolesnikova E. E., Safronowa O. S., Serebrovskaya T. V.

Journal of Physiology and Pharmacology. Supplement

2003

tom 54

nr 1

20-24

Aging is associated with changes in breathing regulation, particularly, in respiratory sensitivity to hypoxic stimuli. One theory of aging holds that reactive oxygen species play a key role in this process. These species have also been implicated in the carotid body O2 sensing. In the present study we investigated hypoxic ventilatory responses (HVR) and antioxidant enzymes activity in healthy young and elderly people under a 14-day adaptation to intermittent hypoxic training (IHT). The elderly demonstrated decreased HVR and blood catalase (CAT) activity on a background of strong negative correlation between the levels of end-tidal CO2 tension and superoxide dismutase (SOD) activity. The adaptation to IHT resulted in increased HVR and SOD activity in both groups, and decreased CAT activity in young persons compared with its augmentation in the elderly. Increased SOD activity testifies to an overproduction of reactive oxygen species during IHT. We hypothesize that reactive oxygen species might potentiate a periodical augmentation of cytosolic Ca2+ in the carotid body. This, in turn, might determine an increase in tyrosine hydroxylase gene expression and promote neurotransmitter synthesis/release, resulting in enhanced HVR.

Ograniczanie wyników

2 Journal of Physiology and Pharmacology. Supplement

1 Jozwik A.

1 Kolesnikova E. E.

1 Safronowa O. S.

1 Serebrovskaya T. V.

1 Sokolowska B.

1 2007

1 2003

Wyniki wyszukiwania

Distinguishing the strength of hypoxic stimulus in intermittent hypoxia

Age-related peculiarities of breathing regulation and antioxidant enzymes under intermittent hypoxic training