Artículos de Investigación

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Author: search.filters.author.will be referenced::ORCID::0000-0001-9392-2319Language: search.filters.language.English

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    Different Shoulder Exercises Affect the Activation of Deltoid Portions in Resistance-Trained Individuals
    (2020)
    Yuri A. C. Campos
    ;
    Jeferson M. Vianna
    ;
    Miller P. Guimarães
    ;
    Jorge L. D. Oliveira
    ;
    Claudio Hernández-Mosqueira
    <jats:title>Abstract</jats:title> <jats:p>The aims of this study were to compare muscle activity of the anterior deltoid, medial deltoid, and posterior deltoid in the bench press, dumbbell fly, shoulder press, and lateral raise exercises. Thirteen men experienced in strength training volunteered for the study. Muscle activation was recorded during maximum isometric voluntary contraction (MVIC) for data normalization, and during one set of 12 repetitions with the load of 60% 1RM in all exercises proposed. One-way repeated-measures ANOVA with Bonferroni’s posthoc was applied using a 5% significance level. For anterior deltoid, the shoulder press (33.3% MVIC) presented a significantly higher level of activation when compared to other exercises. Also, no significant difference was found between the bench press (21.4% MVIC), lateral raise (21.2% MVIC), and dumbbell fly (18.8% MVIC). For the medial deltoid, the lateral raise (30.3% MVIC) and shoulder press (27.9% MVIC) presented a significantly higher level of activity than the bench press (5% MVIC) and dumbbell fly (3.4% MVIC). Besides, no significant difference was found between the bench press and the dumbbell fly. For the posterior deltoid, the lateral raise (24% MVIC) presented a significantly higher level of activation when compared to other exercises. For the posterior deltoid portion, the shoulder press (11.4% MVIC) was significantly more active than the bench press (3.5% MVIC) and dumbbell fly (2.5% MVIC). Moreover, no significant difference was found between the bench press and the dumbbell fly. In conclusion, the shoulder press and lateral raise exercises showed a higher level of muscle activation in the anterior deltoid and medial deltoid when compared to the bench press and dumbbell fly exercises.</jats:p>
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    Effect of neuromuscular resistance training on the performance of 5-km runners
    (2020)
    Miller P. Guimarães
    ;
    Yuri A.C. Campos
    ;
    Hiago L.R. de Souza
    ;
    Gaspar P. da Silva
    ;
    Claudio Hernández-Mosqueira
    <jats:p>The study aimed to identify the effect of a neuromuscular resistance training protocol (NRTP) on the performance of 5-km distance runners. This study included 18 male runners (age=29.3±3.2 years, fat percentage=11.3±2.6%, body height=1.77±.04 m, body mass=73.4±4.4 kg, time in 5 km=20.6±2.4 min, training years=4.3±0.7 years). First, volunteers were anthropometrically evaluated, and they performed one-repetition maximum (1RM) 45º leg press (LP) strength test. Second, they performed an incremental protocol in the 45º LP to acquire the electromyographic threshold. Third, they completed a 5-km time trial run (5 km basal). In the fourth session, they performed NRTP in LP. And fifth, the 5-km time trial run was performed at 30 min, 48 h, 96 h, and 144 h post the NRTP intervention. A significant decrease (p≤.05) was observed when baseline values were compared with post 30 min and post 48 h (p=.02 and p=.04, respectively). However, there were significant positive differences in performance (p=.04 for time) when baseline values and post 144 h were analyzed. Therefore, it is concluded that the NRTP can be used by 5-km distance runners to improve their performance with a break of one week between the intervention and test.</jats:p>
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    Level of physical activity, eating habits, and their relationship with academic performance in adolescent students at COMEDUC foundation, Chile.
    (2019)
    Ibarra Mora, Jessica
    ;
    Ventura-Vall-Llovera, Carles
    ;
    Hernández-Mosqueira, Claudio
    This study was aimed to determine the impact of the level of physical activity and eating habits in the academic performance of an adolescent school population in Chile. The study has a descriptive cross-cutting design. The sample was formed by 2116 students (60.8% women and 39.2% men), later it was stratified according to level of physical activity and eating habit. Habits were determined by means of a 24-hour reminder, the level of physical activity by means of the International Physical Activity Questionnaire, and the general school averages, mathematics and language, as well as standardized tests were considered. For the analysis of data, descriptive and inferential statistics were used. The results indicated that having a high level of physical activity and having the main meals per day is associated with a better school performance, highlighting the importance of promoting these habits among the school community.