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Percorrer por autor "Alves, Ana Ruivo"

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  • Bioelectrical Responses to Resistance Training Performed to Momentary Failure or with Repetitions in Reserve: A Within-Subject Analysis of Phase Angle and Impedance Components
    Publication . Vasconcelos, Tiago; Alves, Ana Ruivo; Brito, João Paulo; Oliveira, Rafael
    Resistance 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.
    2026Artigo de investigação Acesso aberto Ver mais
  • Comparative Adaptations to Different Leg Extension Set-termination Strategies in Trained Men and Women: A Unilateral Within-Participant Study
    Publication . Vasconcelos, Tiago; Alves, Ana Ruivo; Refalo, Martin R.; Lucas, Gabriela Chaves; Vasconcelos, Pedro R.; Brito, João Paulo; Vilaça-Alves, José; Oliveira, Rafael
    The 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.
    2026Artigo de investigação Acesso aberto Ver mais
  • Elbow Flexor Adaptations to Failure Versus Repetitions-in-Reserve Training: A Unilateral Within-Participant Study in Resistance-Trained Adults
    Publication . Vasconcelos, Tiago; Alves, Ana Ruivo; Refalo, Martin C.,; Lucas, Gabriela C.; Vasconcelos, Pedro R.; Brito, João Paulo; Casanova, Filipe; Vilaça-Alves, José; Oliveira, Rafael
    This study compared elbow flexor hypertrophy and maximal strength adaptations after eight weeks of resistance training performed either to momentary muscular failure or with 1–3 repetitions in reserve (RIR). Nineteen resistance-trained adults completed a unilateral within-participant protocol in which one arm trained to failure and the contralateral arm trained with 1–3 RIR. Participants trained twice weekly using the unilateral preacher curl exercise at 70–80% one-repetition maximum (1RM). Elbow flexor muscle thickness and 1RM strength were assessed before and after the intervention. Bayesian mixed-effects models estimated between-condition differences. Both protocols increased muscle thickness and 1RM strength. The estimated between-condition differences for muscle thickness were 0.032 cm (95% highest density interval [HDI]: −0.044 to 0.113) while the estimated difference in 1RM strength was 0.588 kg (85% HDI: −0.491 to 1.66), with both 95% HDIs spanning zero and including values favoring either protocol. Sex-specific analyses showed the same general patter of responses. Overall, resistance training performed with 1–3 RIR produces similar elbow flexor hypertrophy and maximal strength adaptations to training performed to momentary muscular failures under the loading and volume conditions examined.
    2026Artigo de investigação Acesso aberto Ver mais