| Autor: |
Carter, Stephen J., Blechschmid, Tyler H., Baranauskas, Marissa N., Long, Emily B., Gruber, Allison H., Raglin, John S., Lim, Kenneth, Coggan, Andrew R. |
| Zdroj: |
American Journal of Physiology: Regulatory, Integrative & Comparative Physiology; Dec2024, Vol. 327 Issue 6, pR534-R542, 9p |
| Abstrakt: |
To inform end points for future work, we explored the utility of preworkout (i.e., an acute dose before training) beetroot juice (BRJ) combined with exercise (BRJ + EX) to augment indices of physical function in postmenopausal women compared with exercise only (EX). A two-arm pilot study was used to compare 24 postmenopausal women following an 8-wk, circuit-based exercise intervention. Participants were randomized to BRJ + EX (n = 12) or EX (n = 12). BRJ + EX participants consumed 140 mL of BRJ 120–180 min (only) before training for 7 wk, then discontinued during the final week to mitigate carryover effects. Physical function indices were 6-min walk test (6MWT), estimated V̇ o 2peak, heart rate recovery (HRR), and maximal knee extensor power (Pmax). A treadmill task was used to measure V̇ o 2 on-kinetics wherein mean response time (MRT) coincided with the duration to reach 63% of steady-state V̇ o 2. Results showed greater changes (Δ) among BRJ + EX participants for 6MWT distance (40 ± 23 m vs. 8 ± 25 m; P = 0.003, d = 1.35), ΔV̇ o 2peak (1.5 ± 0.9 mL·kg−1·min−1 vs. 0.3 ± 1.0 mL·kg−1·min−1; P = 0.008, d = 1.20), and ΔHRR (−10 ± 6 beats/min vs. −1 ± 9 beats/min; P = 0.017, d = 1.05). Large and medium effect sizes favoring BRJ + EX were detected for ΔPmax (P = 0.07, d = 0.83) and ΔMRT (P = 0.257, d = 0.50), respectively. In postmenopausal women, BRJ + EX appears to magnify some adaptive benefits to physical function including aerobic capacity and recovery beyond that of training without BRJ. Investigation into contributing mechanisms is needed. NEW & NOTEWORTHY: Though exercise training represents the principal strategy to combat age-related decline, the attendant effects of menopause weaken aspects of exercise adaptation compared with premenopausal women and age-matched men. Here we provide important initial evidence that preworkout (i.e., an acute dose before training) beetroot juice coupled with an 8-wk, circuit-based exercise training intervention may uniquely benefit late postmenopausal women by enhancing indices of physical function including aerobic capacity and recovery. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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