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Exercise training and 3-day head down bed rest deconditioning: exercise thermoregulation

100%

Smorawinski J., Mlynarczyk C., Ziemba A. W., Mikulski T., Cybulski G., Grucza R., Nazar K., Kaciuba-Uscilko H., Greenleaf J. E.

Journal of Physiology and Pharmacology

2005

tom 56

nr 1

Bed rest (BR) deconditioning causes excessive increase of exercise core body tempera-ture, while aerobic training improves exercise thermoregulation. The study was designed to determine whether 3 days of 6° head-down bed rest (HDBR) affects body temperature and sweating dynamics during exercise and, if so, whether endurance training before HDBR modifies these responses. Twelve healthy men (20.7±0.9 yrs, VO2max: 46±4 ml·kg-1·min-1) underwent HDBR twice: before and after 6 weeks of endurance training. Before and after HDBR, the subjects performed 45 min sitting cycle exercise at the same workload equal to 60% of VO2max determined before training. During exercise the VO2, HR, tympanic (Ttymp) and skin (Tsk) temperatures were recorded; sweating dynamics was assayed from a ventilated capsule on chest. Training increased VO2max by 12.1% (p<0.001). Resting Ttymp increased only after first HDBR (by 0.22 ± 0.08 °C, p<0.05), while exercise equilibrium levels of Ttymp were increased (p<0.05) by 0.21 ± 0.07 and 0.26 ± 0.08 °C after first and second HDBR, respectively. Exercise mean Tsk tended to be lower after both HDBR periods. Total sweat loss and time-course of sweating responses were similar in all exercise tests. The sweating threshold related to Ttymp was elevated (p<0.05) only after first HDBR. In conclusion: six-week training regimen prevents HDBR-induced elevation of core temperature (Ttymp) at rest but not during ex-ercise. The post-HDBR increases of Ttymp without changes in sweating rate and the tendency for lower Tsk suggest an early (<3d) influence of BR on skin blood flow.

Effects of central hypervolemia on respiratory function

80%

Aleksandrova N. P., Donina Z. A., Danilova G. A.

Journal of Physiology and Pharmacology. Supplement

2007

tom 58

nr 5

Ograniczanie wyników

1 Journal of Physiology and Pharmacology

1 Journal of Physiology and Pharmacology. Supplement

1 Aleksandrova N. P.

1 Cybulski G.

1 Danilova G. A.

1 Donina Z. A.

1 Greenleaf J. E.

1 Grucza R.

1 Kaciuba-Uscilko H.

1 Mikulski T.

1 Mlynarczyk C.

1 Nazar K.

1 Smorawinski J.

1 Ziemba A. W.

1 2007

1 2005

Wyniki wyszukiwania

Exercise training and 3-day head down bed rest deconditioning: exercise thermoregulation

Effects of central hypervolemia on respiratory function