Introdução: O handebol é caracterizado como um esporte de cunho coletivo, possuindo grande variedade de movimentações e seus ganhos propiciam melhoramentos nas qualidades físicas e funcionais. Por outro lado, a musculação, que é amplamente praticada atualmente, possibilita muitos ganhos, porém, proporciona baixo melhoramento funcional. O Ciclo Alongamento-Encurtamento (CAE) está baseado no fato de o músculo realizar ativamente uma ação, sendo parte dessa energia armazenada nos componentes elásticos e reutilizada na próxima ação muscular.Objetivo: Comparar a utilização do CAE na potência dos membros inferiores entre os grupos analisados.Métodos: A amostra foi constituída por 16 atletas de handebol (GH) e 12 praticantes de musculação (GM), ambos do sexo feminino. Foi mensurada a potência através da plataforma de contato e atividade eletromiográfica dos músculos: bíceps femoral, reto femoral, gastrocnêmio medial e vasto lateral, através de testes de saltos verticais: Squat Jump e Counter Movement Jump.Resultados: As diferenças estatísticas significativas encontradas entre os grupos foram: o tempo de prática para o GH foi maior, o tempo de prática semanal para o GM foi superior e o percentual de utilização do CAE que para o GH foi de -2,63 e no GM foi de 13,32, para o músculo vasto lateral.Conclusão: Por meio dos resultados obtidos por testes de saltos verticais, o GH utilizou com maior eficiência a força elástica, apresentando superioridade na economia de ativação do vasto lateral. Portanto, as praticantes de musculação são menos econômicas, possivelmente por seu treinamento isolado.Use Stretch-Shortening Cycle in Leaps Handball Athletes and Female BodybuildersIntroduction: Handball is a sport of collective nature, featuring a great variety of moves and its gains provide improvements in physical and functional qualities. However, bodybuilding, which is commonly practiced nowadays, allows many gains, nonetheless, provides low functional improvement. The Stretch-Shortening Cycle (SSC) is based on the fact that the muscle acts actively, with a part of this energy stored in the elastic components and reutilized on the next muscular action.Methods: The sample was built by 16 handball athletes (GH) and 12 bodybuilding practitioners (GM), both of the womankinds. The potency was measured through the muscular contact and electromyographic activity platform: Biceps femoris, rectus femoris, medial gastrocnemius and vastus lateralis, with vertical jumps: Squat Jump e Counter Movement Jump.Objective: To compare the use of the SSC on the potency of the inferior limbs amongst the analyzed groups.Results: The significant statistical differences found between the group were: the practice time for the GH was higher, the weekly practice time for the GM was higher and the usage percentage of the SSC for the GH was of -2.63 and in the GM was of 13.32, for the vastus lateralis muscle.Conclusion: With the results obtained with tests of vertical jumps, the GH used the elastic force more efficiently, displaying superiority on the activation economy of the vastus lateralis. Therefore, the bodybuilding practitioners are less economic, possibly due to their isolated training.

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Background: Face masks are widely used during the COVID-19 pandemic as one of the protective measures against the viral infection risk. Some evidence suggests that face mask prolonged use can be uncomfortable, and discomfort can be exacerbated during exercise. However, the acute responses of mask-wearing during exercise on affective/psychological and exercise performance responses is still a topic of debate.Purpose: To perform a systematic review with meta-analysis of the acute effects of mask-wearing during exercise on affective/psychological and exercise performance responses in healthy adults of different/diverse training status.Methods: This review (CRD42021249569) was performed according to Cochrane’s recommendations, with searches performed in electronic (PubMed, Web of Science, Embase, SportDiscus, and PsychInfo) and pre-print databases (MedRxiv, SportRxiv, PsyArXiv, and Preprint.Org). Syntheses of included studies’ data were performed, and the RoB-2 tool was used to assess the studies’ methodological quality. Assessed outcomes were affective/psychological (discomfort, stress and affective responses, fatigue, anxiety, dyspnea, and perceived exertion) and exercise performance time-to-exhaustion (TTE), maximal power output (POMAX), and muscle force production] parameters. Available data were pooled through meta-analyses.Results: Initially 4,587 studies were identified, 36 clinical trials (all crossover designs) were included. A total of 749 (39% women) healthy adults were evaluated across all studies. The face mask types found were clothing (CM), surgical (SM), FFP2/N95, and exhalation valved FFP2/N95, while the most common exercises were treadmill and cycle ergometer incremental tests, beyond outdoor running, resistance exercises and functional tests. Mask-wearing during exercise lead to increased overall discomfort (SMD: 0.87; 95% CI 0.25–1.5; p = 0.01; I2 = 0%), dyspnea (SMD: 0.40; 95% CI 0.09–0.71; p = 0.01; I2 = 68%), and perceived exertion (SMD: 0.38; 95% CI 0.18–0.58; p < 0.001; I2 = 46%); decreases on the TTE (SMD: −0.29; 95% CI −0.10 to −0.48; p < 0.001; I2 = 0%); without effects on POMAX and walking/running distance traveled (p > 0.05).Conclusion: Face mask wearing during exercise increases discomfort (large effect), dyspnea (moderate effect), and perceived exertion (small effect), and reduces the TTE (small effect), without effects on cycle ergometer POMAX and distance traveled in walking and running functional tests. However, some aspects may be dependent on the face mask type, such as dyspnea and perceived exertion.Systematic Review Registration: [https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD42021249569], identifier [CRD42021249569].

The present study has the objective to correlate the variables of flexibility and muscle power present in the vertical jumps, through tests done with female individuals, performing analyzes about two groups: Handball players (HG); weight lifters (WL). Initially, the protocol consisted on the performing of the flexibility test at Wells Bank. Subsequently, the jump test was performed, using the Counter movement jump (CMJ) and Squat jump (SJ). About the study groups, it can be observed that they have similar physical characteristics, but practice times (HG = 9.25 ± 3.28  versus WL = 1.85 ± 1.47 years) and weekly hours of activities (HG = 3.33 ± 1.23 versus WL = 5.29 ± 1.81 hours) were distinct. In the execution of SJ for HG, a high correlation was presented for all variables (Height 0.615; Power 0.718; Standard power 0.618). It also presented a high correlation in the non-normalized power (0.688) in CMJ. WL did not present a significant correlation for any of the variables. Based on the findings of the present study, jump test results have correlation with variables of flexibility, muscle power and handball players. However, there is no correlation for any variable for weight lifters.

Este trabalho tem como objetivo relatar um pouco da história e da evolução do Laboratório de Biomecânica (LABIOMEC) ao longo dos 50 anos do Centro de Educação Física e Desportos (CEFD) da Universidade Federal da Santa Maria. Para tanto foram realizadas buscas em documentos físicos e arquivos digitais no período de 1970 até os dias atuais em relação ao LABIOMEC em artigos, trabalhos em eventos, monografias de graduação, especialização, dissertações e teses. O artigo foi subdividido em duas partes e nesta segunda é realizado o resgate histórico da evolução técnico-científica ocorrida nas linhas de pesquisa da cinemática e cinética, controle postural e eletromiografia, encerrando com as atividades de divulgação científica realizadas no National Biomechanics Day. A importância desse relato é permitir que parte da história do LABIOMEC e das pessoas que realizaram suas atividades no laboratório como docentes ou discentes fique registrada de forma permanente.

Introdução: Uma forma de avaliar o controle postural, tanto unipodal como bipodal, é através da mensuração da atividade eletromiográfica de músculos de membros inferiores (bíceps femoral, reto femoral, vasto lateral, e gastrocnêmico medial). Objetivos: Comparar o controle postural eletromiográfico bipodal e unipodal de atletas de handebol do sexo feminino com praticantes de musculação do mesmo sexo. Metodologia: O controle postural foi avaliado através do teste de permanecer o mais imóvel possível durante 30 segundos, em apoio bipodal e unipodal direita. Resultados: As atletas de handebol obtiveram maior ativação no músculo reto femoral na condição bipodal, e também para os quatro músculos avaliados na condição unipodal, enquanto que, para as praticantes de musculação a maior ativação foi encontrada apenas para os músculos reto femoral e gastrocnêmio medial na condição unipodal. Conclusão: É possível concluir, com base no presente estudo, que a prática de modalidades esportivas distintas pode interferir, devido a especificidade da modalidade treinada, provocando alterações fisiológicas na manutenção do controle postural, avaliada através da eletromiografia.

PURPOSE: To verify if there is an electromyographic economy and/or an increase in the variables of vertical jumps, both as a function of the use of the Stretch-Shortening Cycle and to compare the findings between young and old women, both active. METHODS: The sample consisted of a group of elderly (GI) and a group of young (GJ), both female. The power was measured through the contact platform and electromyographic activity of the muscles: biceps femoris (BF), rectus femoris (RF), medial gastrocnemius and vastus lateralis, through vertical jumping tests: Squat Jump (SJ) and Counter Movement Jump (CMJ). RESULTS: All the muscles evaluated did not present a statistically significant difference in the electromyographic activation and the comparisons of the mean percentage of use of the Stretch-Shortening Cycle (CAE), but it was observed that for the vastus lateralis and rectus femoris muscles there were significant differences in the comparisons between the two types of jumps of both groups, GI (236.89±115.66 for SJ and 230.45±109.10 for vastus lateralis muscle (VL) CMJ and 155.42±49.06 for SJ and 155 , 45±61.78 for the CMJ of the RF muscle) required greater neuromuscular activation to jump less than GJ (117.40±133.09 for SJ and 133.09±60.71 for VL muscle CMJ and 106.72±34.15 for the SJ and 108.87±38.85 for the CMJ of the RF muscle). CONCLUSIONS: The present study confirms that there was no statistically significant difference in the use of CAE in both groups (GI and GJ). However, when it comes to the skipped height and the power developed, there were statistically significant differences in the comparison of the groups.

O objetivo do estudo foi comparar valores de fadiga em saltos verticais entre mulheres adultas e estudantes pré-púberes de uma escola pública. A fadiga muscular foi analisada através da potência de membros inferiores, pelo protocolo de saltos verticais de 30 segundos. Participaram 16 mulheres adultas e 14 estudantes. Para a comparação dos grupos e as variáveis relacionadas aos saltos, foi utilizado o teste t para amostras independentes, com nível 5% para todos os testes. Os valores de altura de saltos e potência de membros inferiores são afetados pela instauração da fadiga avaliados pelo teste em ambos os grupos.