No description available.

Made available in DSpace on 2014-06-11T19:22:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-12-15Bitstream added on 2014-06-13T18:49:48Z : No. of bitstreams: 1 oliveira_asc_me_rcla.pdf: 1204641 bytes, checksum: 2f663ab68680a4d75547de7f0ac1f958 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / O objetivo do presente estudo foi analisar o comportamento das variáveis amplitude e freqüência do sinal eletromiográfico (EMG) dos músculos bíceps do braço (BB), braquiorradial (BR), tríceps do braço (TB) e multifido (MT) em exercícios isotônicos resistidos de flexão do cotovelo, e avaliar o efeito de um treinamento de oito semanas nos valores de limiar de fadiga eletromiográfico (EMGLF), nas variáveis de amplitude e freqüência eletromiográfica, na frequência cardíaca (FC) e na percepção de esforço (PE). Participaram deste estudo 20 voluntários do gênero masculino, divididos em um grupo controle (GC) e um grupo treinamento (GT). Inicialmente, determinou-se a carga máxima isotônica (CMI) para os exercícios rosca bíceps (RB) e rosca Scott (RS). Na semana seguinte, em três dias diferentes, foram realizados os exercícios rosca bíceps, rosca bíceps adaptado (RBA) e rosca Scott, com intensidades de 25%, 30%, 35% e 40% da CMI pelo período de um minuto, um exercício por dia. A partir dos valores de coeficiente de inclinação (slope) das intensidades de carga foram calculados os valores de EMGLF. Antes e após a execução dos exercícios isotônicos foram realizadas contrações isométricas voluntárias máximas (CIVM) e submáximas (50% da CIVM). Durante a realização dos exercícios isotônicos foram registrados valores de FC e de PE. viii Com os valores de EMGLF do músculo BB foi realizado o treinamento do exercício RBA (8 semanas, 2 sessões semanais, 3 séries até a exaustão com 2 minutos de intervalo entre as séries). Foram analisados os valores de FC, PE, força isométrica máxima, bem como a amplitude e frequência da EMG em contrações isométricas máximas, submáximas e isotônicas. / The aim of this study was to analyze the behaviour of electromyographic (EMG) amplitude and frequency of the biceps brachii (BB), brachioradialis (BR), triceps brachii (TB) and multifidus (MT) in different isotonic resistance elbow flexion exercises, and to evaluate the 8 weeks training effect based in the EMG fatigue threshold (EMGFT) in the EMG variables, heart rate (HR), and perceived exertion (PE). 20 healthy males subjects was divided in a control group (CG, n=10) and a training group (TG, n=10). Initially, the one repetition maximum (1RM) isotonic force for biceps curl (BC) and Scott preacher curl (SC), was obtained. On the next week, in three different days, they was perform the BC, adapted biceps curl (ABC) and SC, with 25%, 30%, 35% e 40% of 1RM for one minute, one exercise per day. With the slope values of each load level, the EMGFT was calculated. Before and after the isotonic exercises, was performed isometric maximum voluntary contractions (IMVC) and submaximal (50% of IMVC). During the isotonic exercises, HR and PE was record. Once the BB EMGFT values were obtained, the TG performs training in the ABC exercise (8 weeks, 2 sessions, 3 exhaustive sets with 2 minutes rest). The HR, PE, isometric and isotonic force, as well as the EMG amplitude and frequency in maxima and submaximal isometric and isotonic contractions. Isotonic 166 contractions were analysed by slope and intercept values so linear regressions pre and post training. The results showed after 1 minute rest, there was recovery for BB muscle in EMG amplitude and frequency during the BC (except for total power). There was load level effect for all exercises, mainly for EMG amplitude (root mean square RMS) for BB and BR, with fatigue-induced immediately after the protocol.

M. Tech. Chiro. / The purpose of this study was to determine the effect that C5 and C6 spinal manipulative therapy had on alpha motorneuron excitability of the musculocutaneous nerve in the biceps brachii muscle. Readings were recorded using Electromyography (EMG). Eighty asymptomatic subjects participated in this study. The subjects selected had to be between 18 and 35 years of age, having experienced no cervical pain, discomfort or pathology. The subjects had to present with a C5 or C6 joint motion restriction based on motion and static palpation. Patients were selected based on their response to advertisements posted throughout the Technikon Witwatersrand. Forty of the subjects were placed in the test group and received C5 or C6 joint manipulation once off. The other forty subjects were placed in the control group. EMG readings were taken before, at the time of, and after the spinal manipulative therapy, to ascertain whether the adjustment influenced the strength of the biceps brachii contraction and the reflexive action of the muscle. Pressure algometry was used on the biceps brachii as a subjective test on each patient. A repeated measure student’s t-test was performed, including a Normality and Equal Variance Test for control and trial groups. This study showed that spinal manipulative therapy momentarily increases alpha motorneuron excitability in the biceps brachii muscle in 71.4% of the patients with C5-C6 joint motion restrictions. / Dr. C. Yelverton Dr. C. J. Hay

No description available.

<p>Syfte och frågeställningar</p><p>Syftet med undersökningen har varit att jämföra två olika styrketräningsmetoder med olika grader av ocklusion för träning av musculus (m.) biceps brachii med avseende på styrka och hypertrofi.</p><p>- Vilken av de två träningsmetoderna påverkar mest effektivt biceps brachiis styrkeutveckling?</p><p>- Vilken av de två träningsmetoderna påverkar mest effektivt biceps brachiis storlek?</p><p>Metod</p><p>Sju manliga försökspersoner fördelade på två grupper (tre i relaxationsgruppen, fyra i kontraktionsgruppen) fick genomgå två tester för att mäta maximal styrka i m. biceps brachii samt ett test för att mäta överarmens omkrets. Därefter fick de träna specifik bicepsträning tre gånger i veckan under fem veckor för att åter testas. Skillnaden i träning för de båda grupperna bestod av en tydlig relaxation (avslappning) en gång under varje rörelsecykel för relaxationsgruppen (relaxationen varade i ca en sekund och utfördes då hanteln var längst ner i rörelsen) medan kontraktionsgruppen ombeddes att kontrahera (spänna) muskeln under hela rörelseförloppet. För- och eftertest jämfördes mot varandra i ett beroende T-test även ökningen i träningsbelastning jämfördes mellan det andra och fjortonde passet. Därefter jämfördes förändringen mellan grupperna.</p><p>Resultat</p><p>Den enda signifikanta förändringen i båda träningsgrupperna för sig noterades i det funktionella testet, med en ökning av den maximala styrkan (p=0,03 för kontraktionsgruppen; p=0,03 för relaxationsgruppen). En ökning av totalbelastningen i antal kg per träningspass noterades, men ökningarna var inte signifikanta. Vid en jämförelse av träningseffekterna av relaxations- och kontraktionsträning av biceps brachii tillsammans uppnåddes statistisk signifikans såväl avseende ökning av omkrets (p=0,0136), för maximal styrka (p=0,0002) som för den totala belastningen mellan det andra och fjortonde träningspasset (p= 0,0293).</p><p>Slutsats</p><p>Sammanfattningsvis kan det konstateras att inga tydliga skillnader mellan träningsgrupperna kunnat urskiljas. Om resultaten för de båda träningsgrupperna sammanvägs uppnås en signifikant ökning av såväl omkrets som maximal styrka.</p>

Orientador: Mauro Gonçalves / Banca: Benedito Sergio Denadai / Banca: Nadir Tassi / Resumo: O objetivo do presente estudo foi analisar o comportamento das variáveis amplitude e freqüência do sinal eletromiográfico (EMG) dos músculos bíceps do braço (BB), braquiorradial (BR), tríceps do braço (TB) e multifido (MT) em exercícios isotônicos resistidos de flexão do cotovelo, e avaliar o efeito de um treinamento de oito semanas nos valores de limiar de fadiga eletromiográfico (EMGLF), nas variáveis de amplitude e freqüência eletromiográfica, na frequência cardíaca (FC) e na percepção de esforço (PE). Participaram deste estudo 20 voluntários do gênero masculino, divididos em um grupo controle (GC) e um grupo treinamento (GT). Inicialmente, determinou-se a carga máxima isotônica (CMI) para os exercícios rosca bíceps (RB) e rosca Scott (RS). Na semana seguinte, em três dias diferentes, foram realizados os exercícios rosca bíceps, rosca bíceps adaptado (RBA) e rosca Scott, com intensidades de 25%, 30%, 35% e 40% da CMI pelo período de um minuto, um exercício por dia. A partir dos valores de coeficiente de inclinação (slope) das intensidades de carga foram calculados os valores de EMGLF. Antes e após a execução dos exercícios isotônicos foram realizadas contrações isométricas voluntárias máximas (CIVM) e submáximas (50% da CIVM). Durante a realização dos exercícios isotônicos foram registrados valores de FC e de PE. viii Com os valores de EMGLF do músculo BB foi realizado o treinamento do exercício RBA (8 semanas, 2 sessões semanais, 3 séries até a exaustão com 2 minutos de intervalo entre as séries). Foram analisados os valores de FC, PE, força isométrica máxima, bem como a amplitude e frequência da EMG em contrações isométricas máximas, submáximas e isotônicas. / Abstract: The aim of this study was to analyze the behaviour of electromyographic (EMG) amplitude and frequency of the biceps brachii (BB), brachioradialis (BR), triceps brachii (TB) and multifidus (MT) in different isotonic resistance elbow flexion exercises, and to evaluate the 8 weeks training effect based in the EMG fatigue threshold (EMGFT) in the EMG variables, heart rate (HR), and perceived exertion (PE). 20 healthy males subjects was divided in a control group (CG, n=10) and a training group (TG, n=10). Initially, the one repetition maximum (1RM) isotonic force for biceps curl (BC) and Scott preacher curl (SC), was obtained. On the next week, in three different days, they was perform the BC, adapted biceps curl (ABC) and SC, with 25%, 30%, 35% e 40% of 1RM for one minute, one exercise per day. With the slope values of each load level, the EMGFT was calculated. Before and after the isotonic exercises, was performed isometric maximum voluntary contractions (IMVC) and submaximal (50% of IMVC). During the isotonic exercises, HR and PE was record. Once the BB EMGFT values were obtained, the TG performs training in the ABC exercise (8 weeks, 2 sessions, 3 exhaustive sets with 2 minutes rest). The HR, PE, isometric and isotonic force, as well as the EMG amplitude and frequency in maxima and submaximal isometric and isotonic contractions. Isotonic 166 contractions were analysed by slope and intercept values so linear regressions pre and post training. The results showed after 1 minute rest, there was recovery for BB muscle in EMG amplitude and frequency during the BC (except for total power). There was load level effect for all exercises, mainly for EMG amplitude (root mean square RMS) for BB and BR, with fatigue-induced immediately after the protocol. / Mestre

Syfte och frågeställningar Syftet med undersökningen har varit att jämföra två olika styrketräningsmetoder med olika grader av ocklusion för träning av musculus (m.) biceps brachii med avseende på styrka och hypertrofi. - Vilken av de två träningsmetoderna påverkar mest effektivt biceps brachiis styrkeutveckling? - Vilken av de två träningsmetoderna påverkar mest effektivt biceps brachiis storlek? Metod Sju manliga försökspersoner fördelade på två grupper (tre i relaxationsgruppen, fyra i kontraktionsgruppen) fick genomgå två tester för att mäta maximal styrka i m. biceps brachii samt ett test för att mäta överarmens omkrets. Därefter fick de träna specifik bicepsträning tre gånger i veckan under fem veckor för att åter testas. Skillnaden i träning för de båda grupperna bestod av en tydlig relaxation (avslappning) en gång under varje rörelsecykel för relaxationsgruppen (relaxationen varade i ca en sekund och utfördes då hanteln var längst ner i rörelsen) medan kontraktionsgruppen ombeddes att kontrahera (spänna) muskeln under hela rörelseförloppet. För- och eftertest jämfördes mot varandra i ett beroende T-test även ökningen i träningsbelastning jämfördes mellan det andra och fjortonde passet. Därefter jämfördes förändringen mellan grupperna. Resultat Den enda signifikanta förändringen i båda träningsgrupperna för sig noterades i det funktionella testet, med en ökning av den maximala styrkan (p=0,03 för kontraktionsgruppen; p=0,03 för relaxationsgruppen). En ökning av totalbelastningen i antal kg per träningspass noterades, men ökningarna var inte signifikanta. Vid en jämförelse av träningseffekterna av relaxations- och kontraktionsträning av biceps brachii tillsammans uppnåddes statistisk signifikans såväl avseende ökning av omkrets (p=0,0136), för maximal styrka (p=0,0002) som för den totala belastningen mellan det andra och fjortonde träningspasset (p= 0,0293). Slutsats Sammanfattningsvis kan det konstateras att inga tydliga skillnader mellan träningsgrupperna kunnat urskiljas. Om resultaten för de båda träningsgrupperna sammanvägs uppnås en signifikant ökning av såväl omkrets som maximal styrka.

M.Tech. (Chiropractic) / Aim: The aim of this study was to determine the effects of chiropractic adjustment therapy (CAT) to the cervical spine on the reflex motorneuron excitability of C5 and C6 nerves on the biceps brachii muscle bilaterally. This study was also aimed at measuring the subsequent increase in strength of the biceps brachii muscle. Method: A selection of 30 participants, male or female and between the ages of 18 and 40 were recruited. Participants had to meet all the inclusion criteria and present with no contra-indications. Only one group was used as each participant served as their own control. Participants were seen seven times over a period of three weeks. The measurements were taken during the 1st, 4th and 7th consultations. On the 2nd, 3rd, 5th and 6th consultations only treatment was applied. On the 7th consultation only data was collected and no treatment was done. Results: Statistically significant improvement of dynamometry and electromyographic measurements were noted over the consultation periods on both sides. No conclusion could be made regarding the comparison of dynamometer and sEMG measurements of the biceps brachii between each consultation and between each side (left and right) over the study period. Conclusion: Based on the results obtained in this research it may be deduced that CAT may have an effect on the neurological system and further more an effect by increasing motorneuron excitability at sites distant to the spine itself. These results are important to the Chiropractic profession as it shows that CAT does not only produce a segmental response, but that there are wide spread effects on structures distant to the spinal column. The extent of the effects CAT can elicit on the nervous system requires further investigation.

<p> The force-velocity and force-length relationships of skeletal muscle have been thoroughly investigated in the literature. Unfortunately many of the relationships that have been applied to models of the human anatomy have been based upon investigations that have been performed under in-vitro conditions. It was the intention of this study to investigate whether the relationships determined by in-vitro investigation and assumed to be correct could accurately and properly be applied to actual human examples. Previous investigation by Leedham and Dowling (1991) displayed that when investigating human elbow flexors and in particular the biceps brachii that the force-length relationship did not concur with in-vitro results. The purpose of this study was to investigate the relationships between length, velocity, EMG and force of the biceps muscle. </p> <p> Eight young adult males (22-26) were fastened into an isoveloci ty device ( CYBEX) which allowed only flexion and extension of the right elbow. The forearm was then rotated eccentrically or concentrically through a range of motion from 50 to 170 degrees of extension (or vice-versa). The biceps muscle was either maximally contracted voluntarily or was excited using electrical stimulation at 40 Hz. Using the constant angle torque (CAT) method and three dimensional surfaces the force-velocity, force-length and EMG-velocity relationships were investigated. <p> <p> The main conclusions of the study were that the neural drive provided by electrical stimulation over the motor point provided CMAPS of consistent amplitude regardless of the joint angle or angular velocity. The concentric force-velocity relationship of the biceps was in agreement with most accounts in the literature however the eccentric contraction condition displayed a peak force production at 30° Is then showed a slight decline to plateau across faster eccentric velocities. Increased eccentric force production was thought to be more mechanical than neurological in nature. </p> / Thesis / Master of Science (MSc)

Schultererkrankungen nehmen in sozioökonomischer Hinsicht einen Spitzenplatz unter den Erkrankungen des Bewegungsapparates ein.58 Die häufigen „klassischen Schultererkrankungen“ wie Schulterinstabilitäten, Rotatorenmanschettenrupturen und Omarthrosen sind schon sehr lange bekannt und durch viele Studien gut untersucht. Demgegenüber stellen Läsionen des Aufhängeapparates der langen Bizepssehne (LBS) eine sehr junge Schulterpathologie dar, über die es noch wenige Daten gibt. Im Jahre 1994 formten Walch et al.62 für diese komplexe intraartikuläre Halteschlinge der LBS den Begriff des „stabilizing pulley“, oder Bizepspulley. Im Folgenden sollen Anatomie, Funktion und Pathologie des Bizepspulleys mit allen wichtigen anatomischen Strukturen kurz erläutert werden. / This study retrospectively analyzed 1007 diagnostic shoulder arthroscopies. The study included 72 patients with an arthroscopically verified pulley lesion as the main pathologic finding. Epidemiologic data and arthroscopic findings were evaluated in all patients, and 53 were clinically examined with the Constant score after a minimum follow-up of 2 years. We observed an incidence of 7.1% for pulley lesions. An isolated rupture of the superior glenohumeral ligament (SGHL) was seen in 53 patients (73.6%) and a combined partial articular-side tear of the rotator cuff adjacent to rotator interval in 19 (26.4%). Thirty-one patients (43%) had a history of trauma, whereas 41 (57%) had none. Overall, the mean postoperative Constant score adjusted for age and gender was 80.1% (range, 47%-135%). Patients with a SGHL lesion only (85.7%) exhibited a significant (P = .047) higher age- and gender-adjusted Constant score compared with patients with a combined partial surface tendon tear (73.1%). Our epidemiologic data accentuate the need for careful evaluation of the superolateral aspect of rotator interval to avoid underdiagnosis of pulley lesions at shoulder arthroscopy. Our findings provide evidence that the clinical outcome of isolated SGHL lesions is better compared with combined partial articular-side rotator cuff tear. With respect to the progressive pathologic process of pulley lesions, we recommend an early surgical treatment.