THE EFFECT OF SHORT- AND LONG-TERM AEROBIC TRAINING YEARS ON SYSTEMIC O-2 UTILIZATION, AND MUSCLE AND PREFRONTAL CORTEX TISSUE OXYGEN EXTRACTION IN YOUNG WOMEN

摘要

This study aimed to determine if systemic O-2 utilization (Vo2) and tissue oxygen extraction (deoxyhemoglobin [HHb]) in the vastus lateralis (VL), gastrocnemius (GAST), and prefrontal cortex were different during exercise between short-term trained (STT, 6-24 months) and long-term trained (LTT, >5 years) young women while controlling for current training load. Thirteen STT and 13 LTT participants completed ramp incremental (RI) and square-wave constant load (SWCL) tests on a cycle ergometer. In LTT compared with STT: (a) (V)over dotO(2) was higher during the RI (p = 0.024) and SWCL (p = 0.001) tests; (b) HHb in the VL (p = 0.044) and GAST (p = 0.027) was higher in the RI test; and (c) there were significant group X intensity interactions for Vol in the SWCL test. The additional years of aerobic training in LTT compared with STT (LTT 7.1 +/- 1.9 vs. STT 1.5 +/- 0.4 years) resulted in higher Vol and HHb in the VL and GAST. These results indicate that in young women, independent of current training load, systemic Vol and peripheral muscle 02 extraction during exercise continues to increase beyond 24 months of aerobic training.