| Autor: |
Buzza G; School of Exercise Science, Sport, and Health, Charles Sturt University, Port Macquarie, AUSTRALIA., Lovell GP; School of Social Sciences, University of the Sunshine Coast, Sippy Downs, AUSTRALIA.; Department of Sport, Hartpury University, Hartpury, UNITED KINGDOM., Askew CD; School of Health and Sport Sciences, University of the Sunshine Coast, Sippy Downs, AUSTRALIA., Solomon C; School of Health and Sport Sciences, University of the Sunshine Coast, Sippy Downs, AUSTRALIA. |
| Abstrakt: |
This study was designed to compare systemic O 2 utilization (V̇O 2 ), and changes in tissue O 2 extraction [deoxyhemoglobin (ΔHHb)] in the vastus lateralis (VL), gastrocnemius (GAST) and pre-frontal cortex (PFC) tissue; between aerobically short-term trained (STT) and long-term trained (LTT) older men (40 - 60 yr) who were matched for current training load. On separate occasions, 14 STT and 14 LTT participants completed ramp incremental (RI) and square-wave constant load (SWCL) tests on a cycle ergometer. In LTT compared to STT; (i) V̇O 2 was higher during the RI ( p > 0.001) and SWCL (p > 0.001) tests, (ii) ΔHHb in the GAST was greater in SWCL ( p = 0.011); and (iii) ΔHHb in the PFC was greater at 90% GET during SWCL ( p = 0.011). The additional years of training in LTT compared to STT (LTT 17.50yr ± 6.94yr vs STT 1.68yr ± 0.31yr) were associated with higher V̇O 2peak , and sub-GET V̇O 2 , and ΔHHb in the GAST and PFC at sub-GET exercise, despite there being no difference in current training volume. |
