Publications (6) View all
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Article: Comparison between constant and decreasing rest intervals: influence on maximal strength and hypertrophy.
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ABSTRACT: Most resistance training programs use constant rest period lengths between sets and exercises, but some programs use decreasing rest period lengths as training progresses. The aim of this study was to compare the effect on strength and hypertrophy of 8 weeks of resistance training using constant rest intervals (CIs) and decreasing rest intervals (DIs) between sets and exercises. Twenty young men recreationally trained in strength training were randomly assigned to either a CI or DI training group. During the first 2 weeks of training, 3 sets of 10-12 repetition maximum (RM) with 2-minute rest intervals between sets and exercises were performed by both groups. During the next 6 weeks of training, the CI group trained using 2 minutes between sets and exercises (4 sets of 8-10RM), and the DI group trained with DIs (2 minutes decreasing to 30 seconds) as the 6 weeks of training progressed (4 sets of 8-10RM). Total training volume of the bench press and squat were significantly lower for the DI compared to the CI group (bench press 9.4%, squat 13.9%) and weekly training volume of these same exercises was lower in the DI group from weeks 6 to 8 of training. Strength (1RM) in the bench press and squat, knee extensor and flexor isokinetic measures of peak torque, and muscle cross-sectional area (CSA) using magnetic resonance imaging were assessed pretraining and posttraining. No significant differences (p < or = 0.05) were shown between the CI and DI training protocols for CSA (arm 13.8 vs. 14.5%, thigh 16.6 vs. 16.3%), 1RM (bench press 28 vs. 37%, squat 34 vs. 34%), and isokinetic peak torque. In conclusion, the results indicate that a training protocol with DI is just as effective as a CI protocol over short training periods (6 weeks) for increasing maximal strength and muscle CSA; thus, either type of program can be used over a short training period to cause strength and hypertrophy.The Journal of Strength and Conditioning Research 07/2010; 24(7):1843-50. · 1.83 Impact Factor -
Article: Profile of isokinetic eccentric-to-concentric strength ratios of shoulder rotator muscles in elite female team handball players.
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ABSTRACT: The purpose of this study was to establish the isokinetic profile of shoulder rotator muscles strength in female handball players. Twenty-seven handball players performed concentric and eccentric strength tests of both dominant and non-dominant upper limbs on an isokinetic dynamometer. Internal and external rotator muscles peak torque was assessed at 1.05, 3.14, and 5.23 rad . s(-1) in concentric mode and at 3.14 and 5.23 rad . s(-1) in eccentric mode. Concentric balance ratio and functional ratio were obtained. Bi-lateral deficiency was compared. Concentric strength for internal and external rotation was significantly greater for the dominant than for the non-dominant limb for all speeds (P < or = 0.0001). For eccentric actions, internal rotator muscles were stronger in the dominant than the non-dominant limb (P < or = 0.0001) at both speeds. Concentric balance and functional balance ratios did not differ between sides at 3.14 rad . s(-1) (P = 0.1631), but at 5.23 rad . s(-1) the functional balance ratio in the dominant limb was lower than for the non-dominant limb (P = 0.0500). Although the dominant side was stronger than the non-dominant side, balance concentric ratios remained the same, with only the functional strength ratio different at 5.23 rad . s(-1). Our results suggest that concentric strength exercises be used for internal and external rotators on the non-dominant side, and functional exercise that improves eccentric rotation strength for prevention programmes.Journal of Sports Sciences 05/2010; 28(7):743-9. · 1.93 Impact Factor -
Article: Relationship between aerobic and anaerobic parameters and functional classification in wheelchair basketball players.
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ABSTRACT: Participation in sports for individuals with disabilities continues to gain popularity. In order to provide fair and equitable competition among persons with different disabilities and functional capacity, a separate functional classification system has been devised for each sport. The aims of the present study were to evaluate aerobic and anaerobic performance of wheelchair basketball athletes and verify a correlation with the International Wheelchair Basketball Federation functional classification system. For this, 17 highly trained male Brazilian basketball wheelchair athletes (25.4+/-4.4 years) from the national team who had taken part in the Athens 2004 Paralympic Games were assessed. These athletes were submitted to cardiopulmonary exercise testing and Wingate-like 30-s sprint test using upper limbs. The present study demonstrated that the functional classification score correlated with relative (r=0.90; P<0.0001) and absolute peak power (r=0.50; P=0.0353) and absolute mean power (r=0.93; P<0.0001) obtained from the Wingate-like 30-s sprint test and also correlated with absolute O(2) peak (r=0.68; P=0.0026) and O(2) at ventilatory threshold (r=0.71; P=0.0014), measured on cardiopulmonary exercise testing. Therefore, our findings support the functional classification created to classify athletes' functional capability on the court, which also correlated with aerobic and anaerobic performance parameters of the elite wheelchair basketball players.Scandinavian Journal of Medicine and Science in Sports 09/2009; 20(4):638-43. · 2.87 Impact Factor -
Article: Inspiratory resistive loading after all-out exercise improves subsequent performance.
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ABSTRACT: We have previously shown that post-exercise inspiratory resistive loading (IRL) reduces blood lactate ([Lac(b)(-)]). In this study, we tested the hypothesis that IRL during recovery could improve subsequent exercise performance. Eight healthy men underwent, on different days, two sequential 30-s, cycle ergometer Wingate tests. During the 10-min recovery period from test 1, subjects breathed freely or through an inspiratory resistance (15 cm H(2)O) with passive leg recovery. Arterialized [Lac(b)(-)] values, perceptual scores (Borg), cardiac output by impedance cardiography (QT), and changes in the deoxygenation status of the M. vastus lateralis by near-infrared spectroscopy (DeltaHHb), were recorded. [Lac(b)(-)] was significantly reduced after 4 min of recovery with IRL (peak [Lac(b)(-)] 12.5 +/- 2.3 mmol l(-1) with free-breathing vs. 9.8 +/- 1.5 mmol l(-1) with IRL). Effort perception was reduced during late recovery with IRL compared with free-breathing. Cardiac work was increased with IRL, since heart rate and QT were elevated during late recovery. Peripheral muscle reoxygenation, however, was significantly impaired with IRL, suggesting that post-exercise convective O(2) delivery to the lower limbs was reduced. Importantly, IRL had a dual effect on subsequent performance, i.e., improvement in peak and mean power, but increased fatigue index (P < 0.05). Our data demonstrate that IRL after a Wingate test reduces post-exercise effort perception and improves peak power on subsequent all-out maximal-intensity exercise.Arbeitsphysiologie 03/2009; 106(2):297-303. · 2.15 Impact Factor -
Article: Análise comparativa da força muscular entre idosas praticantes de musculação, ginástica localizada e institucionalizadas
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ABSTRACT: Introdução: Uma das capacidades físicas treináveis com a prática regular do exercício físico é a força muscular, um componente importante nos programas de treinamento, principalmente para os idosos que, durante o processo de envelhecimento, têm uma redução da força e, como conseqüência, da capacidade funcional. O objetivo do estudo é comparar os níveis de força muscular de idosas praticantes de musculação, ginástica localizada e institucionalizada. Materiais e Métodos: Fizeram parte deste estudo 33 idosas divididas em três grupos, sendo: Grupo de Musculação (GM), composto por 11 idosas com idade média 74±8 anos; e Grupo de Ginástica Localizada (GG), formado por 11 idosas com idade média 67±7 anos. De ambos os grupos, todas eram participantes de programas comunitários de exercício físico por, no mínimo, seis meses. Além disso, o Grupo Controle (GC), composto por 11 voluntárias moradoras de asilo, com idade média de 78±13 anos, não praticantes de exercício físico por, no mínimo, 10 anos. Para avaliação da força muscular, todas as voluntárias realizaram o teste de preensão manual. Resultados: Foi encontrada diferença estatística significativa (p=0,0001) entre o grupo GG (26,09±4,68kg) e o GC (15,27±5,35kg), e entre os GM (26,09±6,28kg) e GC (p=0,0003). Porém, na comparação entre os grupos que praticaram exercícios físicos, os resultados não apresentaram diferença significativa. Discussão: Para a amostra estudada, o exercício físico apresentou efeito positivo para a manutenção da força muscular.Fitness & performance journal, ISSN 1519-9088, Nº. 1, 2009, pags. 16-20.
