<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1645-0523</journal-id>
<journal-title><![CDATA[Revista Portuguesa de Ciências do Desporto]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Port. Cien. Desp.]]></abbrev-journal-title>
<issn>1645-0523</issn>
<publisher>
<publisher-name><![CDATA[Faculdade de Desporto da Universidade do Porto]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1645-05232006000200005</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Exercício rosca bíceps: influência do tempo de execução e da intensidade da carga na atividade eletromiográfica de músculos lombares]]></article-title>
<article-title xml:lang="en"><![CDATA[Biceps curl exercise: endurance time and load level effects in the electromyographic activity of lumbar muscles]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oliveira]]></surname>
<given-names><![CDATA[Anderson]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gonçalves]]></surname>
<given-names><![CDATA[Mauro]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cardozo]]></surname>
<given-names><![CDATA[Adalgiso]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barbosa]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidade Estadual Paulista Instituto de Biociências Departamento de Educação Física]]></institution>
<addr-line><![CDATA[Rio Claro São Paulo]]></addr-line>
<country>Brasil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>05</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>05</month>
<year>2006</year>
</pub-date>
<volume>6</volume>
<numero>2</numero>
<fpage>170</fpage>
<lpage>178</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S1645-05232006000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S1645-05232006000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S1645-05232006000200005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[O objetivo do estudo foi verificar o efeito do tempo de execução, da intensidade da carga e do tipo de contração na atividade eletromiográfica do músculo longuíssimo do tórax bilateralmente, durante a execução do exercício rosca bíceps. Dez voluntários saudáveis executaram o exercício até à exaustão com 25%, 35% e 45% da carga máxima, em três dias diferentes, sendo uma carga por dia. Foram analisadas a root mean square (RMS) e o slope a cada 10% do tempo total. Os resultados mostraram aumento progressivo na RMS com o tempo a 25% e 35% da carga máxima, com aumentos significativos a partir de 80% do tempo de execução. Houve efeito da intensidade da carga nas contrações concêntricas, predominantemente entre 25% e 45% nas diferentes porcentagens de tempo. Ao analisar os tipos de contração observa-se que a RMS nas contrações concêntricas apresenta-se maior que nas contrações excêntricas, predominantemente na carga de 45% para ambos os músculos. As comparações dos valores de slope indicam pequeno efeito da carga e tipo de contração. Estes resultados permitem concluir que a execução do exercício rosca bíceps aumenta a atividade eletromiográfica dos músculos longuíssimos do tórax, principalmente durante movimentos concêntricos dos cotovelos a partir dos 80% do tempo de execução]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The purpose of this study was to verify the effect of execution time, load level and contraction type in the electromyographic activity of longissimus thoracis muscle bilaterally, during the execution of the biceps curl exercise. Ten healthy subjects performed the exercise until exhaustion with 25%, 35% and 45% of one repetition maximum (RM), in three different days. Root mean square and slope were analyzed in each 10% of total time. Results showed a progressive increase in electromyographic activity with time, at 25% and 35% of 1RM with significant increases in the electromyographic activity beginning at 80% of execution time. The effect of load level in the activity of longissimus thoracis muscles occurred in the concentric phase between 25% and 45% of RM. There was a predominantly effect of contraction type at 45% of 1-RM for both muscles, and was found a small effect of contraction type for slope values. These results allow to conclude that the performance of biceps curl exercise increases the electromyographic activity of longissimus thoracis muscles during the concentric elbow movements and at 80% of execution time.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[fadiga muscular]]></kwd>
<kwd lng="pt"><![CDATA[eletromiografia]]></kwd>
<kwd lng="pt"><![CDATA[eretor da espinha]]></kwd>
<kwd lng="pt"><![CDATA[estabilização do tronco]]></kwd>
<kwd lng="pt"><![CDATA[treinamento resistido]]></kwd>
<kwd lng="en"><![CDATA[muscle fatigue]]></kwd>
<kwd lng="en"><![CDATA[electromyography]]></kwd>
<kwd lng="en"><![CDATA[erector spinae]]></kwd>
<kwd lng="en"><![CDATA[trunk stabilization]]></kwd>
<kwd lng="en"><![CDATA[resisted training]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><b>Exerc&iacute;cio rosca b&iacute;ceps: influ&ecirc;ncia    do tempo de execu&ccedil;&atilde;o e da intensidade da carga na atividade eletromiogr&aacute;fica    de m&uacute;sculos lombares.</b></p>      <p align="center"><b>Anderson Oliveira</b></p>     <p align="center"> <b>Mauro Gon&ccedil;alves</b></p>     <p align="center"><b> Adalgiso Cardozo</b></p>     <p align="center"><b> Fernando Barbosa</b></p>     <p align="center"><i>Universidade Estadual Paulista, Instituto de Bioci&ecirc;ncias,    Departamento de Educa&ccedil;&atilde;o F&iacute;sica, Laborat&oacute;rio de    Biomec&acirc;nica, Rio Claro, S&atilde;o Paulo, Brasil.</i> </p>     <p align="center">&nbsp;</p>      <p><b>RESUMO</b></p>     <p>O objetivo do estudo foi verificar o efeito do tempo de execu&ccedil;&atilde;o, da intensidade da carga e do tipo de contra&ccedil;&atilde;o na atividade eletromiogr&aacute;fica do m&uacute;sculo  longu&iacute;ssimo do t&oacute;rax bilateralmente, durante a execu&ccedil;&atilde;o do exerc&iacute;cio  rosca b&iacute;ceps. Dez volunt&aacute;rios saud&aacute;veis executaram o exerc&iacute;cio at&eacute;  &agrave; exaust&atilde;o com 25%, 35% e 45% da carga m&aacute;xima, em tr&ecirc;s dias diferentes, sendo uma  carga por dia. Foram analisadas a root mean square (RMS) e o slope a cada 10% do tempo total. Os resultados  mostraram aumento progressivo na RMS com o tempo a 25% e 35% da carga m&aacute;xima, com aumentos  significativos a partir de 80% do tempo de execu&ccedil;&atilde;o.  Houve efeito da intensidade da carga nas contra&ccedil;&otilde;es conc&ecirc;ntricas, predominantemente  entre 25% e 45% nas diferentes porcentagens de tempo. Ao analisar os tipos de contra&ccedil;&atilde;o  observa-se que a RMS nas contra&ccedil;&otilde;es conc&ecirc;ntricas apresenta-se maior que nas  contra&ccedil;&otilde;es exc&ecirc;ntricas, predominantemente na carga de 45% para ambos os m&uacute;sculos. As compara&ccedil;&otilde;es dos valores de slope indicam pequeno efeito da carga e tipo de  contra&ccedil;&atilde;o.  Estes resultados permitem concluir que a execu&ccedil;&atilde;o do exerc&iacute;cio rosca b&iacute;ceps  aumenta a atividade eletromiogr&aacute;fica dos m&uacute;sculos longu&iacute;ssimos do t&oacute;rax,  principalmente durante movimentos conc&ecirc;ntricos dos cotovelos a partir dos 80% do tempo de  execu&ccedil;&atilde;o</p>      <p><i>Palavras-chave</i>: fadiga muscular, eletromiografia, eretor da espinha,    estabiliza&ccedil;&atilde;o do tronco, treinamento resistido.</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>      <p><b>ABSTRACT</b></p>     <p><b>Biceps curl exercise: endurance time and load level effects in the electromyographic    activity of lumbar muscles.</b></p>      <p>The purpose of this study was to verify the effect of execution time, load level and contraction type in  the electromyographic activity of longissimus thoracis muscle bilaterally, during the execution of the biceps  curl exercise.  Ten healthy subjects performed the exercise until exhaustion with 25%, 35% and 45% of one repetition maximum (RM), in three different days. Root mean square and slope were analyzed in each 10% of total time. Results showed a progressive increase in electromyographic activity with time, at 25% and 35% of 1RM with  significant increases in the electromyographic activity beginning at 80% of execution time. The effect of  load level in the activity of longissimus thoracis muscles occurred in the concentric phase between 25% and  45% of RM. There was a predominantly effect of contraction type at 45% of 1-RM for both muscles, and was  found a small effect of contraction type for slope values. These results allow to conclude that the  performance of biceps curl exercise increases the electromyographic activity of longissimus thoracis muscles during the concentric elbow movements and at 80% of execution time.</p>      <p><i>Key Words:</i> muscle fatigue, electromyography, erector spinae, trunk stabilization,    resisted training.</p>     <p>&nbsp;</p>          <p>Texto completo disponível apenas em PDF.</p>     <p>Full text only available in PDF format.</p>     <p>&nbsp;</p>     <p><b>REFER&Ecirc;NCIAS</b></p>     ]]></body>
<body><![CDATA[<!-- ref --><p>1 Alexander MJL (1985). Biomechanical aspects of lumbar Spine injuries in athletes:    A review. <i>Can J Spt Sci</i> 10(1): 1-20. 1985.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=733627&pid=S1645-0523200600020000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><p>2 Bono CM (2004). Low-back pain in athletes. <i>J Bone Joint Surg Am</i>    86: 382-396.</p>     <p>3 Aaberg E (2001). <i>Muscula&ccedil;&atilde;o, biomec&acirc;nica e treinamento</i>.    S&atilde;o Paulo: Manole.</p>     <p>4 Mcardle WD, Katch FI, Katch VL (1996). <i>Fisiologia do exerc&iacute;cio:    Energia, nutri&ccedil;&atilde;o e desempenho humano</i>. Rio de Janeiro: Guanabara    Koogan.</p>     <p>5 Gon&ccedil;alves M (2000). Limiar de Fadiga Eletromiogr&aacute;fica. In Denadai    BS (ed.) <i>Avalia&ccedil;&atilde;o aer&oacute;bia: Determina&ccedil;&atilde;o    indireta da resposta do lactato sangu&iacute;neo</i>. Rio Claro: Motrix, 131-148.</p>     <p>6 Basmajian jv, De Luca cj (1985). <i>Muscle alive: their function revealed    by electromyography</i>. Baltimore: Willians &amp; Wilkins.</p>     <p>7 Kumar S, Mital A (1996). <i>Electromyography in ergonomics</i>. London:    Taylor &amp; Francis.</p>     <p>8 DeVries HA (1968). Method for evaluation of muscle fatigue and endurance    from electromyographic fatigue curves. <i>Am J Phys Med</i> 47(3): 125-135.  </p>     <p>9 Moritani T, Muro M, Nagata A (1986). Intramuscular and surface electromyogram    changes during muscle fatigue. <i>J Appl Physiol </i>60(4): 1179-1185.</p>     <p>10 Young VL, Seaton MK, Feely CA, Arfken C, Baum DF, Baum CM, Logan S (1995).    Detecting cumulative trauma in workers performing repetitive tasks. <i>Am J    Ind Med</i> 27: 419&#8211;431.</p>     ]]></body>
<body><![CDATA[<p>11 Gon&ccedil;alves M (1998). Vari&aacute;veis Biomec&acirc;nicas Analisadas    Durante o levantamento manual de carga. <i>Motriz</i> 4(2): 85-90.</p>     <p>12 Oliveira ASC, Barbosa FSS, Gon&ccedil;alves M (2004). An&aacute;lise eletromiogr&aacute;fica    dos m&uacute;sculos longu&iacute;ssimo tor&aacute;cico durante exerc&iacute;cio    de flex&atilde;o resistida do cotovelo. <i>Fisioterapia Brasil</i> 5: 15-15.</p>     <p>13 Oliveira ASC, Barbosa FSS, Cardozo AC, Gon&ccedil;alves M (2003). Identifica&ccedil;&atilde;o    eletromiogr&aacute;fica da fadiga muscular no exerc&iacute;cio &#8220;rosca    b&iacute;ceps&#8221;. <i>Revista Brasileira de Ci&ecirc;ncia e Movimento</i>    (suplemento) 245-245.</p>     <p>14 Clark BC, Manini TM, Ploutz-Snyder LL (2003). Derecruitment of the lumbar    musculature with fatiguing trunk extension exercise. <i>Spine</i> 28: 282-287.</p>     <p>15 Cardozo AC, Gon&ccedil;alves M (2003). Electromyographic fatigue threshold    of erector spinae muscle induced by a muscular endurance test in health men.    <i>Electromyogr Clin Neurophysiol</i> 43: 377-380. </p>     <p>16 Bonato P, Boissy P, Della Croce U, Roy SH (2002). Changes in the surface    EMG signal and the biomechanics of motion during a repetitive lifting task.    <i>IEEE Trans Neural Syst Rehabil Eng</i> 10: 38-47.</p>     <p>17 De Luca, CJ (1997). A use of Surface electromyography in biomechanics. <i>J    Appl Biomech</i> 13: 135-263. 1997.</p>     <p>18 Weineck J (1999). <i>Treinamento Ideal</i>. S&atilde;o Paulo: Manole.</p>     <p>19 Oliveira ASC, Gon&ccedil;alves M, Cardozo AC, Barbosa FSS (in press). Electromyographic    fatigue threshold of the biceps brachii muscle during dynamic contraction. <i>Electromyogr    Clin Neurophysiol</i>.</p>     <p>20 Tortoza C, Gon&ccedil;alves M (1993). Montagem de um sistema de sinaliza&ccedil;&atilde;o    para aquisi&ccedil;&atilde;o simult&acirc;nea de sinais eletromiogr&aacute;ficos    e cinematogr&aacute;ficos. In <i>I Simp&oacute;sio de Inicia&ccedil;&atilde;o    Cientif&iacute;ca e V Encontro Interno de Trabalhos Cientif&iacute;cos da Unesp</i>.    PET/ CAPES- Ci&ecirc;ncias Biol&oacute;gicas, Rio Claro, Brasil.</p>     ]]></body>
<body><![CDATA[<p>21 Kumar S (1997). The effect of sustained spinal load on load intra-abdominal    pressure and EMG characteristics of trunk muscle. <i>Ergonomics</i> 40: 1312-1334.</p>     <p>22 van Dieen JH, Oude Vrielink HH, Housheer AF, Lotters FB, Toussaint HM (1993).    Trunk extensor endurance and its relationship to electromyogram parameters.    <i>Eur J Appl Physiol Occup Physiol</i> 66(5): 388-396. </p>     <p>23 Cardozo ac, Gon&ccedil;alves m, Gauglitz acf (2004). Spectral analysis of    the electromyograph of the erector spinae muscle before and after a dynamic    manual load-lifting test. <i>Braz J Med Biol Res</i> 37: 1081-1085.</p>     <p>24 Nielsen PK, Andersen L, Jorgensen K (1998). Muscular load on the lower back    and shoulders due to lifting at different lifting heights and frequencies. <i>Appl    Ergon</i> 29(6): 445-450.</p>     <p>25 Gon&ccedil;alves M, Oliveira ASC, Cardozo AC, Barbosa FSS (2005). Efeito    de um protocolo de exerc&iacute;cio din&acirc;mico no sinal EMG dos m&uacute;sculos    b&iacute;ceps braquial e longu&iacute;ssimo do t&oacute;rax. In <i>XI Congresso    Brasileiro de Biomec&acirc;nica</i> 2005, Jo&atilde;o Pessoa. XI Congresso    Brasileiro de Biomec&acirc;nica - CD ROM.</p>     <p>26 Moseley GL, Hodjes PW, Gandevia SC (2002). Deep and superficial fibers of    the lumbar multifidus muscle are differentially active during voluntary arm    movements. <i>Spine</i> 27(2): E29&#8211;E36.</p>     <p>27 Christensen H, S&oslash;gaard K, Jensen BR, Finsen L, Sj&oslash;gaard G    (1995). Intramuscular and surface EMG power spectrum from dynamic and static    contractions. <i>J Electromyogr Kinesiol </i>5: 27-36.</p>     <p>28 Fallentin N, Jorgensen K, Simonsen EB (1993). Motor unit recruitment during    prolonged isometric contractions. <i>Eur J Appl Physiol Occup Physiol</i>    67: 335-341.</p>     <p>29 Pavlat DJ, Housh TJ, Johnson GO, Eckerson JM (1995). Electromyographic responses at the neuromuscular fatigue threshold. J Sports Med Phys Fitness 35(1): 31-37.</p>     <p>30 Masuda K, Masuda T, Sadoyama T, Inaki M, Katsuta S (1999). Changes in surface    EMG parameters during static and dynamic fatiguing contractions. <i>J Electromyogr    Kinesiol</i> 9: 39-46.</p>     ]]></body>
<body><![CDATA[<p>31 Cordo PJ, Nashner LM (1982). Properties of postural adjustment associed    with rapid arm movements. <i>J Neurphysiol</i> 47: 287-302.</p>     <p>32 Zedka M, Prochaska A (1997). Phasic activity in the human erector spinae    during repetitive hand movements. <i>J Physiol</i> 504(4): 727-734.</p>     <p>33 Seidel H, Beyer H, Brauer D (1987). Electromyographic evaluation of back    muscle fatigue with repeated sustained contractions of different strengths.    <i>Eur J Appl Physiol Occup Physiol</i> 56(5): 592-602.</p>     <p>34 Mannion AF, Dolan P (1996). The effects of muscle length and force output    on the EMG power spectrum of the erector spinae. <i>J Electromyogr Kinesiol</i>    6: 159&#8211;168.</p>     <p>35 van Die&euml;n JH, Heijblom P, Bunkens H (1998). Extrapolation of time series    of EMG power spectrum parameters in isometric endurance tests of trunk extensor    muscles. <i>J Electromyogr Kinesiol</i> 8: 35-44.</p>     <p>36 Bompa T, Cornacchia LJ (2000). <i>Treinamento de for&ccedil;a consciente</i>.    S&atilde;o Paulo: Phorte. </p>     <p>&nbsp;</p>     <p><b>CORRESPOND&Ecirc;NCIA</b></p>     <p><i>Anderson Oliveira</i></p>     <p><i>Laborat&oacute;rio de Biomec&acirc;nica</i></p>     ]]></body>
<body><![CDATA[<p><i>Departamento de Educa&ccedil;&atilde;o F&iacute;sica</i></p>     <p><i>Instituto de Bioci&ecirc;ncias</i></p>     <p><i>Universidade Estadual Paulista</i></p>     <p><i>Av. 24-A, n&ordm; 1515 - Bela Vista</i></p>     <p><i>13506-900 - Rio Claro - SP</i></p>     <p><i>Brasil</i></p>     <p><a href="mailto:andcast@rc.unesp.br">andcast@rc.unesp.br</a></p>       ]]></body><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Alexander]]></surname>
<given-names><![CDATA[MJL]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Biomechanical aspects of lumbar Spine injuries in athletes: A review]]></article-title>
<source><![CDATA[Can J Spt Sci]]></source>
<year>1985</year>
<month>19</month>
<day>85</day>
<volume>10</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>1-20</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
