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ENDURANCE TRAINING DOES NOT AFFECT CUTANEOUS BLOOD FLOW DURING PROLONGED EXERCISE
Author(s) -
Kearney Matthew L,
Fogelman Amy E,
Kuipers Nathan T,
Ray Chester A
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.21.6.a1296-b
The predominate theory for causality of cardiovascular (CV) drift is an increase in cutaneous blood flow (CBF) during prolonged exercise. This study investigated changes in CBF associated with CV drift before and after 8 weeks of endurance training. It was hypothesized that after training less blood would be shunted to skin during prolonged exercise, thus stabilizing stroke volume and heart rate (HR). Thirteen healthy, young subjects (25±1yr) cycled for 40 min at the same work rate (50%of pretraining VO 2peak ) both before and after training. HR, mean arterial pressure (MAP), forearm CBF (laser‐Doppler flowmetry), VO 2 , and tympanic temperature were recorded at rest and during exercise. Maximal CBF was determined by local heating of the skin to 42°C. VO 2peak increased 17±3% after training (p < 0.01). HR increases during cycling were significantly less after training (p < 0.01). CBF increased to 39% of maximal blood flow during exercise (p < 0.01) and was not changed by training (p = 0.62). Tympanic temperature was lower during exercise after 8 weeks of training ( 0.34°C; p = 0.03). MAP decreased less during exercise after training than before training ( 15 mmHg vs. 5 mmHg; p = 0.04). These results support the emerging concept that increases in CBF during prolonged exercise are not responsible for increases in HR observed with CV drift. NIH DC006459 , HL077670 , and MO1RR10732