A Comparison of V̇O2, and Muscle and Prefrontal Cortex Tissue Oxygen Extraction Between Short and Long-term Aerobically Trained Men Aged 40 - 60 Years

• Published in: International journal of exercise science Vol. 13; no. 3; pp. 964 - 978
• Main Author: Buzza, Gavin
• Format: Journal Article
• Language: English
• Published: Berkeley Electronic Press 01-08-2020
• Subjects: Original Research
• DOI: 10.70252/AVNW2791
• EISSN: 1939-795X

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.