Percorrer por autor "Duarte Martins, Alexandre"
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- 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.
- Effects of a 16-week high-speed resistance training program on heart rate variability indices in community-dwelling independent older adults: A clinical trialPublication . Duarte Martins, Alexandre; Fernandes, Orlando; Brito, João Paulo; Gonçalves, Bruno; Oliveira, Rafael; Batalha, NunoThis study explored the impact of a 16-week high-speed resistance training (HSRT) program on heart rate variability (HRV) indices in independent older adults. The participants were divided into either an intervention group (IG, N = 40) or a control group (CG, N =39). The IG participated in supervised HSRT sessions three times weekly, comprising 5–6exerciseswith2–3setsand6–10 repetitions, which lasted 60–70 min. The CG did not engage in any exercise program. HRV indices, encompassing time, frequency, and non-linear, were recorded over a six-minute period. The ANCOVA results revealed significant improvements favoring the IG for mean RR (η2 p = 0.050), systolic blood pressure (η2 p = 0.126), and pulse pressure (η2 p = 0.157). Additionally, within-group analyses revealed significant increases in stress index (dunb = 0.52), sample entropy (dunb = 0.38), and DFA α1(dunb = 0.38) exclusively in the CG. This study highlights the significant potential of the HSRT to induce favorable changes in parasympathetic activity and reduce arterial stiffness.
- Effects of a 16-Week High-Speed Resistance Training Program on Isokinetic Muscle Strength Parameters and Health-Related Quality of Life in Independent Older Adults: A Clinical TrialPublication . Duarte Martins, Alexandre; Fernandes, Orlando; Brito, João Paulo; Gonçalves, Bruno; Oliveira, Rafael; Batalha, Nunohis study investigated the effects of a 16-week high-speed resistance training (HSRT) program on isokinetic muscle strength parameters and, secondarily, on health-related quality of life (HRQOL). Seventy-nine independent older adults were assigned to an intervention group (IG) and a control group (CG). The IG completed supervised HSRT three times per week, while the CG received no intervention. Each session lasted 60–70 minutes and included 5–6 exercises of 2–3 sets at maximal concentric speed and a controlled eccentric phase (≈2–3 seconds). Isokinetic muscle strength was assessed pre- and post-intervention using isokinetic testing of knee extensors (KE) and flexors (KF) at 60º/s and 180º/s on dominant (DS) and non-dominant sides (NDS). The HRQOL was measured using the SF-36 questionnaire. The IG demonstrated significant improvements in peak torque for KE-DS. The present HSRT protocol effectively improves isokinetic muscle parameters and HRQOL measures in older adults.
- The role of physical activity levels in retaining high-speed resistance training effects on body composition: a 1-year follow-up in older adults.Publication . Duarte Martins, Alexandre; Batalha, Nuno; Fernandes, Orlando; Oliveira, Rafael; Gonçalves, Bruno; Brito, João PauloPurpose This study evaluated the influence of physical activity (PA) on the retention of body composition effects achieved through a 16-week high-speed resistance training (HSRT) program over a 1-year follow-up period. Methods Forty independent older adults participated in the supervised 16-week HSRT program. After the intervention ended, participants were encouraged to maintain high PA levels. At the 1-year follow-up, 36 participants completed the assessments and were divided into the light activity group (LAG, N = 20, age 70.00 ± 3.66 years) and the moderate-to-vigorous activity group (MVAG, N = 16, age 68.50 ± 2.09 years). Body composition ( InBody® S10), PA levels (International Physical Activity Questionnaire), and anthropometric measurements were assessed at four time points. Results Significant time effects were observed for several body composition parameters over the 1-year follow-up period, with large effect sizes. Specifically, MVAG revealed significant declines in weight (p = 0.002, dunb = −0.22), body mass index (p = 0.002, dunb = −0.30), and fat mass (%) (p = 0.028, dunb = −0.30) from post-intervention to the 1-year follow-up. Conversely, LAG demonstrated significant reductions in fat-free mass (p = 0.018, dunb = −0.14), muscle mass (p = 0.010, dunb = −0.15), and lean mass (p = 0.014, dunb = −0.14) from pre-intervention to the 6-month follow-up (p < 0.001, dunb = −0.18), with body cell mass also presenting significant declines from post-intervention to the 1-year follow-up (p = 0.035, dunb = −0.13). Despite an overall decline, PA remained relatively higher than pre-intervention, particularly for total weekly activity (minutes) and energy expenditure from moderate-to-vigorous PA. Conclusions This study highlights the benefits of engaging in at least moderate PA activities for retaining the effects achieved on a previous exercise program, particularly reductions in fat mass.
- Variations of training workload parameters between player positions in under-17 elite European soccer team: a full-seasonPublication . Duarte Martins, Alexandre; Oliveira, Rafael; Brito, João Paulo; Loureiro, Nuno; Querido, Sérgio; Nobari, HadiThe purpose of this study was to analyse variations in rating of perceived exertion (RPE), session-RPE, training duration, training monotony, training strain, and acute chronic workload ratio (ACWR) between mesocycles and within microcycles during the in-season 2017–18, across player positions in young soccer players. Seventeen young soccer players were evaluated over 50 weeks. The field positions of the players consisted of four central defenders, three wide defenders, four central midfielders, three wide midfielders, and three strikers. There were significant differences between player positions in mesocycle 6 for central defenders vs strikers (p= .047; ES = 4.02 [1.51, 7.96]) on duration of training sessions. The ACWR ratio remained similar throughout the season, between the optimum workload (.8–1.3). In microcycle analysis, match day minus 3 was the day of the week with the highest values for all variables. The findings of the present study showed no difference between positions, but lower values were found after and before the match, while higher values were found in the middle of the microcycle.