Eleven recreational weightlifters (21.27 1.42 years) were tested at random in the Wingate anaer... more Eleven recreational weightlifters (21.27 1.42 years) were tested at random in the Wingate anaerobic test, at intensities equivalent to 75, 90, and 95 g/kg of body mass (BM), at intervals of 24-48 hours, aiming at comparisons between relative (RPP) peak power, relative average power (RAP), and fatigue index (FI). The relations between the loads for peak and average power were also determined. Pearson’s correlation coefficient and ANOVA repeated measures, followed by Tukey’s post hoc test, were used for the analyses (p 0,05). The results showed that RPP obtained with the loads of 90 and 95 g/kg of BM, presented values significantly highest to the load of 75 g/kg of BM (13–14%, respectively), as well as to RAP (8.3-8.8%). The correlation coefficients obtained for anaerobic power (peak power) and anaerobic capacity (average power) among the different loads varied between 0.83-0.93 and 0.81-0.90, respectively. Therefore, it is concluded of the importance and need of discussing the ch...
Post-stroke patients usually exhibit reduced peak muscular torque (PT) and/or force steadiness du... more Post-stroke patients usually exhibit reduced peak muscular torque (PT) and/or force steadiness during submaximal exercise. Brain stimulation techniques have been proposed to improve neural plasticity and help to restore motor performance in post-stroke patients. The present study compared the effects of bihemispheric motor cortex transcranial direct current stimulation (tDCS) on PT and force steadiness during maximal and submaximal resistance exercise performed by post-stroke patients vs. healthy controls. A double-blind randomized crossover controlled trial (identification number: TCTR20151112001; URL: http://www.clinicaltrials.in.th/) was conducted involving nine healthy and 10 post-stroke hemiparetic individuals who received either tDCS (2 mA) or sham stimulus upon the motor cortex for 20 min. PT and force steadiness (reflected by the coefficient of variation (CV) of muscular torque) were assessed during unilateral knee extension and flexion at maximal and submaximal workloads (1 set of 3 repetitions at 100% PT and 2 sets of 10 repetitions at 50% PT, respectively). No significant change in PT was observed in post-stroke and healthy subjects. Force steadiness during knee extension (~25-35%, P < 0.001) and flexion (~22-33%, P < 0.001) improved after tDCS compared to the sham condition in post-stroke patients, but improved only during knee extension (~13-27%, P < 0.001) in healthy controls. These results suggest that tDCS may improve force steadiness, but not PT in post-stroke hemiparetic patients, which might be relevant in the context of motor rehabilitation programs.
Page 1. Montenegro et al.: Cadência de pedalada em teste incremental máximo www.brjb.com.br Brazi... more Page 1. Montenegro et al.: Cadência de pedalada em teste incremental máximo www.brjb.com.br Brazilian Journal of Biom otricity , v. 5, n. 3, p. 200-209, 2011 (ISSN 1981-6324) 200 ARTIGO ORIGINAL (ORIGINAL PAPER) EFEITO DA CADÊNCIA DE ...
ABSTRACT The aim of the present study was to establish comparisons among the bone mineral content... more ABSTRACT The aim of the present study was to establish comparisons among the bone mineral content (BMC), the total bone mineral density (TOTAL BMD) and located bone mineral density (BMD) in the different corporal segments, training apprentices with weights of young male adults and sedentary young male adults. The sample was constituted by 23 individuals that were divided in training group (TG; n=12; 24.17 ± 2.69 years; 72.90 ± 8.81 kg; 176.48 ± 6.69 cm) and sedentary group (SG; n=11; 24.09 ± 2.55 years; 71.22 ± 10.77 kg; 177.63 ± 7.13 cm). The bone component was analyzed through the technique Dual-energy x-ray absorptiometry (DEXA). For comparison of the analyzed parameters was used the Student test "t" for independent samples (p<0,05). The BMC, total BMD, lower-body BMD, trunk BMD, rib BMD and column BMD, were larger significantly to TG compared to SG (p<0,05). However, for the values of upper-body BMD and pelvis BMD, they were not found significant diferences between TG and SG (p>0,05). In agreement with the results, we can suggest that the weight training contributes to increase of the bone tissue what can minimize the effects of the bone loss process with moving forward of the age.
Eleven recreational weightlifters (21.27 1.42 years) were tested at random in the Wingate anaer... more Eleven recreational weightlifters (21.27 1.42 years) were tested at random in the Wingate anaerobic test, at intensities equivalent to 75, 90, and 95 g/kg of body mass (BM), at intervals of 24-48 hours, aiming at comparisons between relative (RPP) peak power, relative average power (RAP), and fatigue index (FI). The relations between the loads for peak and average power were also determined. Pearson’s correlation coefficient and ANOVA repeated measures, followed by Tukey’s post hoc test, were used for the analyses (p 0,05). The results showed that RPP obtained with the loads of 90 and 95 g/kg of BM, presented values significantly highest to the load of 75 g/kg of BM (13–14%, respectively), as well as to RAP (8.3-8.8%). The correlation coefficients obtained for anaerobic power (peak power) and anaerobic capacity (average power) among the different loads varied between 0.83-0.93 and 0.81-0.90, respectively. Therefore, it is concluded of the importance and need of discussing the ch...
The purpose of this study was to compare the effect of using single-set or three-set in programs ... more The purpose of this study was to compare the effect of using single-set or three-set in programs of strength training with duration of 8 weeks on the maximum strength, as well as on the subsequente detraining of this capacity neuromuscular for a period of 10 weeks in women. For this, after to be made familiarization for a first test one-repetition maximum (1-RM) in the exercises: chest press, lat pulldown, leg extension and leg curl. The 19 volunteers had been reevaluated in its maximum strength after 2 days of rest. Later, they had been divided in two groups: one that trained through three set the exercises of down-body and through only one set the exercises of upper-body (3DB-1UB), and another group that made the inverse one (1DB-3UB). Both had trained with a frequency of three weekly sessions, with loads that allowed the accomplishment of 10-12 RM, which were adjusted in accordance with the evolution of the training state. The strength of both the group improved 4 weeks of traini...
The objective of this study was to compare the efficiency of pedaling (EP) and the electromyograp... more The objective of this study was to compare the efficiency of pedaling (EP) and the electromyographic activity (EMG) between cyclists and non-cyclists during cycling in different cadences. Using a cyclosimulator, 12 cyclists (26.5 +/- 4.5 years; 68.2 +/- 10.5 kg; 175.6 +/- 8.2 cm) and 9 non-cyclists (25.1 +/- 4.3 years; 72.6 +/- 9.8 kg; 174.6 +/- 6.2 cm), performed a maximum incremental test (ITmax), and subsequently, two constant load tests (Tconst) in different cadences (60 and 90 rpm) at the intensity of the electromyographic fatigue threshold (EMGth) determined in ITmax. Before the Tconst, the subjects performed a maximum isometric voluntary contraction (MIVC) for the normalization of the EMG data of Tconst. During Tconst, the EMG of the studied muscles was recorded, as well as the EP Although there was a trend of higher values in all occasions for the cyclists, there were no statistical differences in EP and the EMG when compared in a same cadence between groups. However, when t...
Eleven recreational weightlifters (21.27 1.42 years) were tested at random in the Wingate anaer... more Eleven recreational weightlifters (21.27 1.42 years) were tested at random in the Wingate anaerobic test, at intensities equivalent to 75, 90, and 95 g/kg of body mass (BM), at intervals of 24-48 hours, aiming at comparisons between relative (RPP) peak power, relative average power (RAP), and fatigue index (FI). The relations between the loads for peak and average power were also determined. Pearson’s correlation coefficient and ANOVA repeated measures, followed by Tukey’s post hoc test, were used for the analyses (p 0,05). The results showed that RPP obtained with the loads of 90 and 95 g/kg of BM, presented values significantly highest to the load of 75 g/kg of BM (13–14%, respectively), as well as to RAP (8.3-8.8%). The correlation coefficients obtained for anaerobic power (peak power) and anaerobic capacity (average power) among the different loads varied between 0.83-0.93 and 0.81-0.90, respectively. Therefore, it is concluded of the importance and need of discussing the ch...
Post-stroke patients usually exhibit reduced peak muscular torque (PT) and/or force steadiness du... more Post-stroke patients usually exhibit reduced peak muscular torque (PT) and/or force steadiness during submaximal exercise. Brain stimulation techniques have been proposed to improve neural plasticity and help to restore motor performance in post-stroke patients. The present study compared the effects of bihemispheric motor cortex transcranial direct current stimulation (tDCS) on PT and force steadiness during maximal and submaximal resistance exercise performed by post-stroke patients vs. healthy controls. A double-blind randomized crossover controlled trial (identification number: TCTR20151112001; URL: http://www.clinicaltrials.in.th/) was conducted involving nine healthy and 10 post-stroke hemiparetic individuals who received either tDCS (2 mA) or sham stimulus upon the motor cortex for 20 min. PT and force steadiness (reflected by the coefficient of variation (CV) of muscular torque) were assessed during unilateral knee extension and flexion at maximal and submaximal workloads (1 set of 3 repetitions at 100% PT and 2 sets of 10 repetitions at 50% PT, respectively). No significant change in PT was observed in post-stroke and healthy subjects. Force steadiness during knee extension (~25-35%, P < 0.001) and flexion (~22-33%, P < 0.001) improved after tDCS compared to the sham condition in post-stroke patients, but improved only during knee extension (~13-27%, P < 0.001) in healthy controls. These results suggest that tDCS may improve force steadiness, but not PT in post-stroke hemiparetic patients, which might be relevant in the context of motor rehabilitation programs.
Page 1. Montenegro et al.: Cadência de pedalada em teste incremental máximo www.brjb.com.br Brazi... more Page 1. Montenegro et al.: Cadência de pedalada em teste incremental máximo www.brjb.com.br Brazilian Journal of Biom otricity , v. 5, n. 3, p. 200-209, 2011 (ISSN 1981-6324) 200 ARTIGO ORIGINAL (ORIGINAL PAPER) EFEITO DA CADÊNCIA DE ...
ABSTRACT The aim of the present study was to establish comparisons among the bone mineral content... more ABSTRACT The aim of the present study was to establish comparisons among the bone mineral content (BMC), the total bone mineral density (TOTAL BMD) and located bone mineral density (BMD) in the different corporal segments, training apprentices with weights of young male adults and sedentary young male adults. The sample was constituted by 23 individuals that were divided in training group (TG; n=12; 24.17 ± 2.69 years; 72.90 ± 8.81 kg; 176.48 ± 6.69 cm) and sedentary group (SG; n=11; 24.09 ± 2.55 years; 71.22 ± 10.77 kg; 177.63 ± 7.13 cm). The bone component was analyzed through the technique Dual-energy x-ray absorptiometry (DEXA). For comparison of the analyzed parameters was used the Student test "t" for independent samples (p<0,05). The BMC, total BMD, lower-body BMD, trunk BMD, rib BMD and column BMD, were larger significantly to TG compared to SG (p<0,05). However, for the values of upper-body BMD and pelvis BMD, they were not found significant diferences between TG and SG (p>0,05). In agreement with the results, we can suggest that the weight training contributes to increase of the bone tissue what can minimize the effects of the bone loss process with moving forward of the age.
Eleven recreational weightlifters (21.27 1.42 years) were tested at random in the Wingate anaer... more Eleven recreational weightlifters (21.27 1.42 years) were tested at random in the Wingate anaerobic test, at intensities equivalent to 75, 90, and 95 g/kg of body mass (BM), at intervals of 24-48 hours, aiming at comparisons between relative (RPP) peak power, relative average power (RAP), and fatigue index (FI). The relations between the loads for peak and average power were also determined. Pearson’s correlation coefficient and ANOVA repeated measures, followed by Tukey’s post hoc test, were used for the analyses (p 0,05). The results showed that RPP obtained with the loads of 90 and 95 g/kg of BM, presented values significantly highest to the load of 75 g/kg of BM (13–14%, respectively), as well as to RAP (8.3-8.8%). The correlation coefficients obtained for anaerobic power (peak power) and anaerobic capacity (average power) among the different loads varied between 0.83-0.93 and 0.81-0.90, respectively. Therefore, it is concluded of the importance and need of discussing the ch...
The purpose of this study was to compare the effect of using single-set or three-set in programs ... more The purpose of this study was to compare the effect of using single-set or three-set in programs of strength training with duration of 8 weeks on the maximum strength, as well as on the subsequente detraining of this capacity neuromuscular for a period of 10 weeks in women. For this, after to be made familiarization for a first test one-repetition maximum (1-RM) in the exercises: chest press, lat pulldown, leg extension and leg curl. The 19 volunteers had been reevaluated in its maximum strength after 2 days of rest. Later, they had been divided in two groups: one that trained through three set the exercises of down-body and through only one set the exercises of upper-body (3DB-1UB), and another group that made the inverse one (1DB-3UB). Both had trained with a frequency of three weekly sessions, with loads that allowed the accomplishment of 10-12 RM, which were adjusted in accordance with the evolution of the training state. The strength of both the group improved 4 weeks of traini...
The objective of this study was to compare the efficiency of pedaling (EP) and the electromyograp... more The objective of this study was to compare the efficiency of pedaling (EP) and the electromyographic activity (EMG) between cyclists and non-cyclists during cycling in different cadences. Using a cyclosimulator, 12 cyclists (26.5 +/- 4.5 years; 68.2 +/- 10.5 kg; 175.6 +/- 8.2 cm) and 9 non-cyclists (25.1 +/- 4.3 years; 72.6 +/- 9.8 kg; 174.6 +/- 6.2 cm), performed a maximum incremental test (ITmax), and subsequently, two constant load tests (Tconst) in different cadences (60 and 90 rpm) at the intensity of the electromyographic fatigue threshold (EMGth) determined in ITmax. Before the Tconst, the subjects performed a maximum isometric voluntary contraction (MIVC) for the normalization of the EMG data of Tconst. During Tconst, the EMG of the studied muscles was recorded, as well as the EP Although there was a trend of higher values in all occasions for the cyclists, there were no statistical differences in EP and the EMG when compared in a same cadence between groups. However, when t...
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