Percorrer por autor "Batalha, Nuno"
A mostrar 1 - 10 de 11
Resultados por página
Opções de ordenação
- Análise das características ondulatórias da técnica de bruços com snorkelPublication . Conceição, Ana; Silva, António; Boaventura, José; Freitas, João; Matos, Telmo; Batalha, Nuno; Milheiro, Vitor; Louro, HugoResumo: O objectivo do estudo consistiu em analisar em que medida é que a utilização do snorkel influencia a eficiência da onda céfalo-caudal, assim como as componentes do movimento ondulatório na técnica de bruços, pela análise de fourier e do número de strouhal. A amostra foi constituída por 8 nadadores portugueses do género masculino (21.25±6.73 anos de idade, 1.77±0.03 m de estatura; 71.14±12.39 kg; 14.89±6.41 %MG; 1.84±0.03 m de envergadura), especialistas na técnica de bruços, com elevado nível competitivo. O protocolo consistiu em realizar dois percursos máximos de 25m em nado global com snorkel ou válvula especifica para natação AQUATRAINER® . Foi efectuada a análise cinemática (Ariel Performance Analysis System, Ariel Dynamics Inc., Califórnia, EUA) de um ciclo gestual completo, com uma frequência de 50 Hz. Recorreu-se ao método de digitalização em planos separados (aéreo e subaquático) e subsequente reconstrução pela aplicação do algoritmo 2D DLT. A velocidade do deslocamento do centro de massa (CM) apresenta um valor médio de 0.91 m.s.-1 (DP= 0.30), no que diz respeito à distância que o nadador percorre, durante um ciclo completo de membros superiores, é em média de 1.22 m.c-1 (DP=0.44), a frequência gestual foi de 45.34 ciclos por unidade de tempo (DP= 9.21). Em média o número de Strouhal foi igual a 0.53 com uma amplitude média de 0.12 m variando entre 0.08 m e 0.18 m . Na análise de Fourier (H1), o valor da frequência apresenta valores próximos de 0.78 Hz e em H2, a frequência apresenta valores médios de 1.56 Hz.
- Assessment of isometric strength of the shoulder rotators in swimmers using a handheld dynamometer: a reliability studyPublication . Conceição, Ana; Parraça, José; Marinho, Daniel; Costa, Mário; Louro, Hugo; Silva, António; Batalha, NunoPurpose: The purpose of this study was to determine the reliability of shoulder isometric strength assessment using the microfet 2™ dynamometer in adolescent swimmers. Methods: Twenty-nine participants (16.2 ± 1.2 years old; 59.05 ± 6.98 kg of body mass) were tested using the microfet 2™ dynamometer. Swimmers performed an isometric strength test (IST) in two distinct occasions with 7 days apart in order to calculate the reliability. All participants were asked to perform a maximal isometric contraction from the external and internal shoulder rotators in a prone body position. Results: The external and internal shoulder rotators showed an excellent intraclass correlation coefficients for both shoulders, with more than 0.90 and a low percentage of method error variation. The external/internal ratios reliability was good in dominant (ICC 0.80) and non-dominant (ICC 0.81) shoulders. The reliability using Bland–Altman method showed that systematic errors (mean difference between test-retest) were nearly zero and the 95% limits of agreement narrow, indicating a good reliability. Conclusions: It can be concluded that microfet 2™ is a reliable apparatus for measuring the strength of the external and internal rotation of the shoulder in swimmers. Its light weight and easy portable characteristics can help swimming coaches monitoring specific dry-land strength training programs for their swimmers
- Changes in muscular activity in different stable and unstable conditions on aquatic platformsPublication . Conceição, Ana; Fernandes, Orlando; Baia, Miguel; Parraça, José A.; Gonçalves, Bruno; Batalha, NunoThe present study aimed to analyse and compare the muscle activity of twelve participants (seven men and five women) (age 20.1 ± 0.9 years; height 170.5 ± 10 cm; body mass: 64.86 ± 8.3 kg) in two exercises, each with two variants: squat (dynamic and static) and plank (hands and elbows) in a stable environment on land and an unstable environment on an aquatic platform. The erector spinae, biceps femoris, rectus femoris, external oblique, and rectus abdominis muscles were evaluated using surface electromyography. The dynamic squat increases the recruitment of the biceps femoris and external oblique, while the static squat demands greater activation of the rectus femoris. The elbow plank exercise increases the recruitment of erector spinae muscles, and the hand plank exercise increases the recruitment of the erector spinae and external oblique. In conclusion, performing exercises in unstable conditions on an aquatic platform slightly increases muscle recruitment.
- Comparison of cardiorespiratory resistance in different menstrual cycle phases in female futsal playersPublication . Nabo, Joana; Conceição, Ana; Parraça, José; Tomas-Carus, Pablo; Batalha, NunoIntroduction: This study was aimed to investigated and compare the cardiorespiratory resistance of futsal players during the follicular and luteal phases of the menstrual cycle. Material and methods: Fourteen female players (age: 24.1 ± 4.1 years; body mass: 59.6 ± 9.1 kg; height: 1.64 ± 0.06 m; index body mass: 22.1 ± 2.8 kg/m2) were submitted to a cardiorespiratory resistance test, that was performed in a calibrated treadmill, where we had as reference for the calculation of VO2max. Each subject also performed two evaluations of the intended test, corresponding to the phases of the menstrual cycle: folicular phase (day 8 ± 3) and luteal phase (day 20 ± 2). Results: The results of the present research showed that there were significant changes, showing higher values of the cardiorespiratory resistance in luteal phase (VO2max = 41.199 ml/kg/min) compared to folicular phase of the menstrual cycle (VO2max = 39.030 ml/kg/min), where p = 0.043. There is still a great deal of controversy in the existing literature when considering a relationship of menstrual cycle phases to physical exercise. Conclusion: The cardiorespiratory resistance of futsal players was increased in luteal phase compared to follicular phase, and management of the training is advisable, namely in type and volume.
- 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 physical and cognitive function in community‑dwelling independent older adults: a clinical trialPublication . Martins, Alexandre Duarte; Batalha, Nuno; Fernandes, Orlando; Gonçalves, Bruno; Oliveira, Rafael; Brito, João PauloPurpose This study investigated the effects of a 16-week high-speed resistance training (HSRT) program on physical and cognitive function in independent older adults. Methods Seventy-nine participants were assigned to an intervention group (IG, N= 40, 68.50 ± 3.54 years) or a control group (CG, N = 39, 72.08 ± 5.89 years). The IG completed 60–70 min of supervised HSRT three times weekly for 16 weeks. All concentric actions were continuously monitored with a BEAST™ sensor. Physical function was evaluated by five tests: chair‐stand, timed up and go (TUG), seated medicine ball throw (SMBT), six-minute walk (6MWT), and handgrip strength. General cognitive function was assessed with the mini-mental state examination (MMSE). Results The intervention could induce significant improvements in favor of the IG (p < 0.001) for chair-stand ( 2 p = 0.736), TUG test ( 2 p = 0.635), SMBT ( 2 p = 0.331), 6MWT ( 2 p = 0.386), and handgrip strength test for dominant ( 2 p = 0.448) and non-dominant side( 2 p = 0.388), as well as in general cognitive function (MMSE, p = 0.001, 2 p = 0.146). Conclusions The 16-week HSRT program led to substantial enhancements in both physical and cognitive function. Inter estingly, the HSRT program, tailored to general velocity zones, proved to be a safe and motivational approach to physical exercise within this population.
- Long-term effects on rate of torque development and fear of falling following high-speed resistance training in older adultsPublication . Martins, Alexandre Duarte; Fernandes, Orlando; Gonçalves, Bruno; Batalha, Nuno; Brito, João Paulo; Oliveira, RafaelThis study examined the influence of physical activity (PA) on the retention of rate of torque development (RTD) effects achieved following a 16-week high-speed resistance training (HSRT) over a 12-month follow-up period. Secondly, the fear of falling was also assessed. After the follow-up, 36 participants were categorized into two groups according to the PA: light activity group (LAG, N = 20, age 70.00 ± 3.66 years) and moderate-to-vigorous activity group (MVAG, N = 16, age 68.50 ± 2.09 years). At the four time points, RTDPEAK and its time intervals for knee extension and flexion were measured using an isokinetic dynamometer at 60º/s, and the fear of falling was assessed using the Falls Efficacy Scale–International questionnaire. Both groups showed significant RTDPEAK improvements from pre intervention to the 12-month follow-up (moderate-to-large effect sizes). However, PA levels suggested to influence the retention effects: LAG showed declines in dominant RTDPEAK (2% in extension and flexion) and in non-dominant side (6% extension and 5% flexion). In contrast, the MVAG maintained or slightly improved RTDPEAK performance in dominant (1% extension and 2% flexion) and in non dominant side (3% extension and 1% flexion). Fear of falling scores remained significantly reduced in both groups compared to pre-intervention, regardless of PA level. In summary, maintaining moderate to-vigorous PA during follow-up appears to enhance the long-term retention of HSRT-induced neuromuscular adaptations, whereas HSRT effects on fear of falling were sustained regardless of PA level, highlighting its clinical potential for fall prevention.
- Long-term impact of physical activity levels after high-speed resistance training on cardiac autonomic control in independent older adultsPublication . Duarte Martins, Alexandre António Ferreira; Fernandes, Orlando; Brito, João Paulo; Oliveira, Rafael; Gonçalves, Bruno; Batalha, NunoThis study investigated the influence of physical activity (PA) levels on the long-term retention of the effects on cardiac autonomic control, assessed by heart rate variability (HRV), following a 16-week high-speed resistance training (HSRT) program over a 12-month follow-up period. At 12-month follow-up period, 36 participants who completed the measurements were categorized into light activity group (LAG) and moderate-to-vigorous activity group (MVAG) based on their PA levels. HRV data were recorded over a 6-min period. Significant within-group differences were observed over time. In MVAG, systolic blood pressure was significantly lower at the 6-month follow-up compared to pre-intervention (dunb = −0.87), while in LAG, diastolic blood pressure was lower at the 12-month follow-up compared to post-intervention (dunb = −0.66). Additionally, MVAG demonstrated significantly higher mean RR values at the 12-month compared to the 6-month follow-up (dunb = 0.49). Moreover, minimum and mean heart rate values were significantly higher at the 6-month compared to the 12-month follow-up (dunb = −0.39 and dunb = −0.42, respectively) in MVAG. Lastly, Sample Entropy was significantly higher in LAG compared to MVAG at 12-month follow-up (dunb = −0.89). In conclusion, participants who maintained moderate-to-vigorous PA during the 12-month follow-up demonstrated better retention of parasympathetic-related indices effects, as well as overall autonomic nervous system markers.
- Phase angle as a key marker of muscular and bone quality in community-dwelling independent older adults: A cross-sectional exploratory pilot studyPublication . Martins, Alexandre; Brito, João; Batalha, Nuno; Oliveira, Rafael; Parraca, Jose A.; Fernandes, OrlandoThe aim of the present cross-sectional exploratory pilot study was to analyze the ability of the Phase Angle (PhA) to predict physical function, muscle strength and bone indicators, upon adjusting for potential confounders [age, sex, lean mass, and body mass index (BMI)]. This study included 56 physically independent older adults (age, 68.29 ± 3.01 years; BMI, 28.09 ± 4.37 kg/ m2 ). A multi-frequency segmental bioelectrical impedance analysis was used to measure PhA at 50 KHz. Additionally, physical function was assessed through four functional capacity tests [30- sec chair-stand; seated medicine ball throw (SMBT); timed up & go; and 6-min walking test (6 MWT)], muscle strength through the handgrip test (dominant side) and maximal isokinetic strength of the dominant knee flexor and extensor. Moreover, bone indicators and body composition were assessed through the dual energy X-ray absorptiometry. PhA was significantly associated with SMBT (r = 0.375, effect size (ES) = moderate); 6 MWT (r = 0.396, ES = moderate); 30-sec chair-stand (rho = 0.314, ES = moderate); knee extension (rho = 0.566, ES = large) and flexion (r = 0.459, ES = moderate); handgrip (rho = 0.432, ES = moderate); whole-body bone mineral content (BMC) (r = 0.316, ES = moderate); femoral neck BMC (r = 0.469, ES = moderate); and femoral neck bone mineral density (BMD) (rho = 0.433, ES = moderate). Additionally, the results of multiple regression analysis demonstrated that PhA is significantly associated with SMBT (p < 0.001; R2 = 0.629), 6 MWT (p = 0.004; R2 = 0.214), knee extension (p < 0.001; R2 = 0.697), knee flexion (p < 0.001; R2 = 0.355), handgrip test (p < 0.001; R2 = 0.774), whole-body BMC (p < 0.001; R2 = 0.524), femoral neck BMC (p = 0.001; R2 = 0.249), and femoral neck BMD (p = 0.020; R2 = 0.153). The results of the preliminary analysis suggested that PhA is linked to muscle strength and some factors related to physical function and bone quality in community-dwelling 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.