Effect of sit-to-stand-based training on muscle quality in sedentary adults: a randomized controlled trial

Abstract

The aim of this study was to compare the effects of sit-to-stand (STS) training programs with 5 vs. 10 repetitions on muscle architecture and muscle function in sedentary adults. Sixty participants were randomly assigned into three groups: five-repetition STS (5STS), 10-repetition STS (10STS), or a control group (CG). Participants performed three sets of five or 10 repetitions of the STS exercise three times per week for 8 weeks. Before and after 8 weeks, all groups performed ultrasound measures to evaluate muscle thickness (MT), pennation angle (PA), and fascicle length (FL), and the five-repetition STS test to estimate the relative STS power and muscle quality index (MQI). After 8 weeks, both experimental groups improved MQI (40–45%), relative STS power (29–38%), and MT (8–9%) (all p < 0.001; no differences between the 5STS vs. 10STS groups). These improvements in both groups resulted in differences regarding the CG, which did not present any change. In addition, only the 5STS group improved PA (15%; p = 0.008) without differences to the 10STS and CG.This suggests that STS training is time-effective and low-cost for improving muscle function and generating adaptations in muscle architecture.

Task-specific resistance training adaptations in older adults: comparing traditional and functional exercise interventions

“…This suggests that, within each intervention group, participants exhibited enhancements in task-specific performance, isometric MVC force, and muscle hypertrophy, but potentially smaller changes in non-specific neuromuscular performance. In agreement with the present results, recent investigations have illustrated that functional exercises mimicking activities of daily living such as chair stands, walking, and balance training can stimulate muscle growth in older adults ( Hortobágyi et al, 2015 ; Gadelha et al, 2018 ; Lizama-Pérez et al, 2023 ). For example, Lizama-Pérez et al (2023) found that 12 weeks of chair stand training increased thigh muscle CSA and strength in older females.…”

“…In agreement with the present results, recent investigations have illustrated that functional exercises mimicking activities of daily living such as chair stands, walking, and balance training can stimulate muscle growth in older adults ( Hortobágyi et al, 2015 ; Gadelha et al, 2018 ; Lizama-Pérez et al, 2023 ). For example, Lizama-Pérez et al (2023) found that 12 weeks of chair stand training increased thigh muscle CSA and strength in older females. Similarly, Hortobágyi et al (2015) reported that 6 weeks of bodyweight-supported treadmill training led to greater quadriceps muscle volume in frail elders.…”