A carregar...
4 resultados
Resultados da pesquisa
A mostrar 1 - 4 de 4
- Effect of different resistance training programs on phase angle in young adults: a scoping reviewPublication . Vasconcelos, Tiago; Alves, Ana Sofia; Duarte Martins, Alexandre; Puda, Dominik; Oliveira, RafaelThis scoping review explored the effect of different strength training programs on Phase Angle, a marker of cellular health, in healthy young adults. A systematic search was conducted using PubMed, SciELO, Web of Science, Scopus, until April 2025, following the PRISMA framework (PICOS) for longitudinal controlled trials with healthy adults (18–35 years) undergoing strength training (dynamic/isometric) for at least 4 weeks. Of 8722 records, four studies were included, revealing variable immediate effects of strength training on Phase Angle (increases, decreases, and no significant changes). The synthesised evidence suggests, however, that strength training protocols with higher training volumes and intensities may be associated with more favourable long-term changes in Phase Angle. It is concluded that, although strength training with higher volume and intensity may be beneficial, the immediate effects on Phase Angle are variable. Modalities such as low-load blood flow restriction training or low-frequency isometric training may not improve, or may even decrease, Phase Angle in the short term. Given the scarcity and heterogeneity of studies, this review is exploratory, and further research is needed to optimise Phase Angle through strength training in young adults.
- Effect of different resistance training programs on Phase angle in young adults: a scoping reviewPublication . Vasconcelos, Tiago; Alves, Ana Sofia; Duarte Martins, Alexandre António Ferreira; Puda, Dominik; Oliveira, RafaelThis scoping review explored the effect of different strength training programs on Phase Angle, a marker of cellular health, in healthy young adults. A systematic search was conducted using PubMed, SciELO, Web of Science, Scopus, until April 2025, following the PRISMA framework (PICOS) for longitudinal controlled trials with healthy adults (18–35 years) undergoing strength training (dynamic/ isometric) for at least 4 weeks. Of 8722 records, four studies were included, revealing variable immediate effects of strength training on Phase Angle (increases, decreases, and no significant changes). The synthesised evidence suggests, however, that strength training protocols with higher training volumes and intensities may be associated with more favourable long-term changes in Phase Angle. It is concluded that, although strength training with higher volume and intensity may be beneficial, the immediate effects on Phase Angle are variable. Modalities such as low-load blood flow restriction training or low-frequency isometric training may not improve, or may even decrease, Phase Angle in the short term. Given the scarcity and heterogeneity of studies, this review is exploratory, and further research is needed to optimise Phase Angle through strength training in young adults
- Bioelectrical Responses to Resistance Training Performed to Momentary Failure or with Repetitions in Reserve: A Within-Subject Analysis of Phase Angle and Impedance ComponentsPublication . Vasconcelos, Tiago; Alves, Ana Ruivo; Brito, João Paulo; Oliveira, RafaelResistance training (RT) may alter tissue electrical properties, but whether proximity to momentary muscular failure influences longitudinal bioelectrical responses remains unclear. This study compared eight weeks of unilateral RT performed to failure (FAIL) or with repetitions in reserve (RIR) on segmental phase angle (PhA), resistance (R), and reactance (Xc). Nineteen resistance-trained adults (11 men: age 20.4 ± 1.8 years, height 172.7 ± 5.6 cm, body mass 74.9 ± 7.6 kg; 8 women: 24.8 ± 4.7 years, 164.1 ± 8.0 cm, 63.0 ± 10.1 kg) completed twice-weekly unilateral preacher curl and leg extension training, with contralateral limbs randomized to FAIL or RIR. Outcomes were assessed at baseline, week 4, and week 8 using Bayesian Gaussian mixed-effects models, with sex-specific interaction analyses treated as exploratory. Week-8 FAIL-RIR PhA contrasts were −0.079 (95% CrI: −0.440 to 0.286) and −0.065 (−0.390 to 0.256) in women’s and men’s arms, and −0.014 (−0.329 to 0.298) and 0.011 (−0.284 to 0.302) in their legs. With female as the reference category, week-8 protocol × time estimates for R were 0.922 (95% CrI: −23.693 to 25.946) in the arm and −4.106 (−17.415 to 9.360) in the leg; corresponding Xc estimates were 0.191 (−2.301 to 2.643) and −0.762 (−2.506 to 0.958), respectively. These findings are limited to segmental limb-level bioelectrical estimates and should not be interpreted as localized responses of the specifically trained muscles.
- Comparative Adaptations to Different Leg Extension Set-termination Strategies in Trained Men and Women: A Unilateral Within-Participant StudyPublication . Vasconcelos, Tiago; Alves, Ana Ruivo; Refalo, Martin R.; Lucas, Gabriela Chaves; Vasconcelos, Pedro R.; Brito, João Paulo; Vilaça-Alves, José; Oliveira, RafaelThe purpose of this study was to compare relative adaptations between two set-termination strategies (momentary muscular failure vs. repetitions in reserve) using a unilateral within-participant design under ecologically realistic resistance-training conditions. Nineteen trained subjects (11 men, eight women; mean age: 22.3 6 3.9 years; body mass: 69.9 6 10.3 kg) completed an 8-week unilateral intervention. Each subject performed leg extensions, with one limb randomly assigned to the FAIL protocol and the contralateral limb to the repetitions-in-reserve (RIR) protocol. Muscle thickness (ultrasound) of the knee extensors and 1-repetition maximum strength were assessed pre- and postintervention and analyzed using Bayesian linear mixed-effect models. Estimated between-protocol differences for hypertrophy were negligible (knee extensors: 20.019 cm [20.094 to 0.054]), as were differences for 1-repetition maximum strength (knee extensors: 0.198 kg [21.87 to 2.6]). Secondary analyses using standardized mean differences also suggested no clear overall advantage for either protocol. These findings suggest that resistance training performed with a 1- to 3-RIR may produce adaptations comparable with training to momentary muscular failure in knee extensors under applied training conditions. Strength and conditioning professionals may therefore consider RIR-based strategies as a practical approach to manage fatigue while maintaining training effectiveness.