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      Acute static muscle stretching improves manual dexterity in young men Translated title: EFEITO AGUDO DO ALONGAMENTO ESTÁTICO SOBRE A DESTREZA MANUAL DE JOVENS DESTREINADOS

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          Abstract

          OBJECTIVE: This study aimed to evaluate the influence of acute muscle stretching on manual function. METHODS: The sample consisted of 10 untrained men in a randomized, four test session cross-over experimental design. Each session was composed of only one of two protocols: a) control, or b) single series of passive static stretching; followed by either Minnesota Hand dexterity test or hand grip strength test with eletromyographical recording of reaction time. For data comparison, the Student T-test with significance level of p ≤ 0.05 was used. RESULTS: Manual dexterity increased after stretching for both placing and turning tests, with no changes in hand grip strength or reaction time. CONCLUSION: The results show that a 30 second static stretch of the hand decreases time to complete the Minnesota Hand Dexterity test without affecting handgrip strength or hand reaction time; thus it improves manual dexterity of young untrained men.

          Translated abstract

          OBJETIVO: Este estudo objetivou avaliar a influência do alongamento sobre a função manual. MÉTODOS: A amostra foi composta por 10 homens destreinados em um delineamento experimental cross-over randomizado, com quatro sessões de testes. Cada sessão foi constituída apenas por um dos protocolos: a) controle ou b) série única de alongamento estático passivo seguidos pelo minnesota Hand Dexterity Test ou pelo Teste de Preensão Manual com analise eletromiográfica do Tempo de Reação Manual. Para as comparações dos dados, o teste T de Student foi usado, com o índice de significância adotado de p ≤ 0,05. RESULTADOS: O alongamento aumentou a destreza manual em ambos Placing e Turning Tests, sem alterar a força de preensão manual ou o tempo de reação. CONCLUSÃO: Os resultados indicam que o alongamento melhorou a destreza manual de jovens destreinados.

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          Most cited references36

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          Reduced strength after passive stretch of the human plantarflexors.

          The purpose of this study was to assess strength performance after an acute bout of maximally tolerable passive stretch (PS(max)) in human subjects. Ten young adults (6 men and 4 women) underwent 30 min of cyclical PS(max) (13 stretches of 135 s each over 33 min) and a similar control period (Con) of no stretch of the ankle plantarflexors. Measures of isometric strength (maximal voluntary contraction), with twitch interpolation and electromyography, and twitch characteristics were assessed before (Pre), immediately after (Post), and at 5, 15, 30, 45, and 60 min after PS(max) or Con. Compared with Pre, maximal voluntary contraction was decreased at Post (28%) and at 5 (21%), 15 (13%), 30 (12%), 45 (10%), and 60 (9%) min after PS(max) (P < 0.05). Motor unit activation and electromyogram were significantly depressed after PS(max) but had recovered by 15 min. An additional testing trial confirmed that the torque-joint angle relation may have been temporarily altered, but at Post only. These data indicate that prolonged stretching of a single muscle decreases voluntary strength for up to 1 h after the stretch as a result of impaired activation and contractile force in the early phase of deficit and by impaired contractile force throughout the entire period of deficit.
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            The Aging Hand

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              Effect of acute static stretching on force, balance, reaction time, and movement time.

              The purpose of the study was to investigate the effect of an acute bout of lower limb static stretching on balance, proprioception, reaction, and movement time. Sixteen subjects were tested before and after both a static stretching of the quadriceps, hamstrings, and plantar flexors or a similar duration control condition. The stretching protocol involved a 5-min cycle warm-up followed by three stretches to the point of discomfort of 45 s each with 15-s rest periods for each muscle group. Measurements included maximal voluntary isometric contraction (MVC) force of the leg extensors, static balance using a computerized wobble board, reaction and movement time of the dominant lower limb, and the ability to match 30% and 50% MVC forces with and without visual feedback. There were no significant differences in the decrease in MVC between the stretch and control conditions or in the ability to match submaximal forces. However, there was a significant (P < 0.009) decrease in balance scores with the stretch (decreasing 9.2%) compared with the control (increasing 17.3%) condition. Similarly, decreases in reaction (5.8%) and movement (5.7%) time with the control condition differed significantly (P < 0.01) from the stretch-induced increases of 4.0% and 1.9%, respectively. In conclusion, it appears that an acute bout of stretching impaired the warm-up effect achieved under control conditions with balance and reaction/movement time.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                medical
                MedicalExpress
                MedicalExpress (São Paulo, online)
                Mavera Edições Técnicas e Científicas Ltda (São Paulo, SP, Brazil )
                2318-8111
                2358-0429
                June 2017
                : 4
                : 3
                : M170306
                Affiliations
                [1] Seropédica Rio de Janeiro orgnameUniversidade Federal Rural do Rio de Janeiro Brazil
                [2] Seropédica Rio de Janeiro orgnameUniversidade Federal Rural do Rio de Janeiro Brazil
                Article
                S2358-04292017000300006
                10.5935/medicalexpress.2017.03.06
                e175d6e8-885e-4e38-b162-4eee094c20bb

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 01 May 2017
                : 09 June 2017
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 43, Pages: 0
                Product

                SciELO Brazil

                Categories
                Rapid Communication

                destreza motora,tempo de reação,motor skills,Muscle stretching,reaction time,Alongamento muscular

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