Marcos Daniel Motta Drummond

Effects of 12 weeks of dynamic strength training with local vibration

Abstract The purpose of this study was to investigate the chronic effects of dynamic strength training (ST) with local vibration on the maximum strength of elbow flexor muscles. Twenty healthy male untrained volunteers were divided randomly into the following two groups: the conventional training group (CTG) or the vibration training group (VTG). Both groups performed ST for 12 weeks, three times a week. The ST protocol included four sets of 8–10 repetition maximums (RMs) of unilateral elbow flexion exercise. The VTG performed this training protocol with local vibration at a frequency of 30 Hz and amplitude of 6 mm. The mean values of the one repetition maximum (1RM) tests for both groups increased significantly from the pretest week to the fourth week and from the fourth week to the eighth week (CTG: mean 19.02, s = 7.88%, p = 0.01; mean 10.50, s = 6.86%, p = 0.019, respectively; VTG: mean 16.02, s = 8.30%, p = 0.017; mean 12.55, s = 8.76%, p = 0.019, respectively). The increases in the maximal voluntary contraction (MVC) tests were also statistically significant from the pretest week to the fourth week and from the fourth week to the eighth week (CTG: mean 12.32, s = 8.33%, p = 0.004; mean 9.95, s = 5.32%, p = 0.006, respectively; VTG: mean 10.16, s = 11.71%, p = 0.003; mean 10.36, s = 2.96%, p = 0.01, respectively). There was no significant difference between the 1RM and MVC test results in the eighth and twelfth weeks in either group. No significant differences were observed between the groups (p < 0.05). In conclusion, the application of local vibration does not change the chronic effects of dynamic ST in untrained individuals.

Effect of strength training on regional hypertrophy of the elbow flexor muscles

Introduction: Muscle hypertrophy is the main structural adaptation to strength training. We investigated the chronic effects of strength training on muscle hypertrophy in different regions of the elbow flexor muscles. Methods: Eleven untrained men (21.8 ± 1.62 years) underwent magnetic resonance imaging to determine the proximal, medial, distal, and mean cross‐sectional areas (CSA) of the elbow flexors. The volunteers completed 12 weeks of strength training. The training protocol consisted of 4 sets of 8–10 maximum repetitions of unilateral elbow flexion. The interval between sets was 120 s. The training frequency was 3 sessions per week. Results: The magnetic resonance images verified the presence of significant and similar hypertrophy in the distal, medial, and proximal portions of the elbow flexor muscles. Conclusions: Muscle hypertrophy may be assessed using only the medial CSA. We should not expect different degrees of hypertrophy among the regions of the elbow flexor muscles. Muscle Nerve 54: 750–755, 2016

Efeito de 12 semanas de treinamento aeróbio em jejum sobre o emagrecimento

This study aimed to verify 12 weeks of aerobic training effect on fasting weight loss performed between October 2014 and March 2015 at Pitágoras a city in Betim/MG. The sample was 33 sedentary women without metabolic diseases. Initially the volunteers were submitted to aerobic capacity test (Balke-Ware) and body composition evaluation. It was recorded the total body mass (TBM), muscle mass (MM), fat mass (FM) and percentage of body fat (PBF) by tetrapolar bioimpedance. Then the volunteers were randomly divided into three groups, who performed aerobic training in a treadmill. One group performed the training in fasting (FT) in the post-absorptive period, with low intensity (50% of the heart rate reserve), while another group performed the same training, but in fed state (PT). The third group ran the same distance from the other groups, but with higher intensity (HIT) (70% of the heart rate reserve) in fed state. To compare body composition and aerobic capacity before and after training it was used the paired t test, while to compare the percentage change of MCT and the PGC between groups it was used the ANOVA one-way test. The results showed that the aerobic capacity increased in all groups, but the increase was greater in the HIT. Further, the HIT presented a significant reduction in FM and PBF, while the FT and PT groups showed no significant changes in body composition. No significant differences were found between the groups in relation to variation of PGC and PBF. It was concluded that fasted aerobic training has no additional effect on weight loss.