English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Objective: The aim of this study was to compare muscle oxygenation of the vastus lateralis during a high volume, isokinetic resistance exercise protocol (HVP) between young adult (YA) and middle-aged adult (MA) men.Methods: Twenty recreationally trained men were assigned to either the YA (21.8±2.0 y, 90.7±11.6 kg, 179±4.7 cm) or MA (47.0±4.4 y, 96.1±21.6 kg, 177±7.7 cm) group. The HVP consisted of eight sets of 10 repetitions of unilateral isokinetic concentric knee extension and eccentric knee flexion at 60°·sec-1. Changes in tissue hemoglobin saturation index (TSI), tissue oxygenated hemoglobin concentration (O2Hb), deoxygenated hemoglobin (HHb), and muscle oxidation index (O2Hb-HHb) were measured during the exercise session using near-infrared spectroscopy (NIRS). Data were analyzed using two-way mix factorial analyses of variance. Results: Prior to exercise, TSI was significantly greater for YA compared to MA (73.2±3.4% vs. 68.6±4.8%, p=0.024). For both groups, significant decreases in O2Hb and O2Hb-HHb, and increases in HHb were observed during each of the eight sets relative to the rest periods (p<0.05). However, the average change during the eight sets of the HVP revealed a significantly higher (p=0.036) level of HHb (7.8±0.5μM vs. 5.3±3.1μM) and a lower (p=0.029) level of O2Hb-HHb (-11.3±1.4μM vs. -7.1±5.5μM) for MA compared to YA.Conclusions: During a high volume, resistance exercise protocol, middle-aged adults experienced reduced muscle oxygen saturation levels compared to younger, recreationally active adults. These results suggest that age-related changes in muscle oxygenation appear to occur in middle-aged adults, regardless of recreational exercise training experience.

Differences in muscle oxygenation between young and middle-aged recreationally active men during high-volume resistance exercise