Differences in muscle strength after ACL reconstruction do not influence cardiorespiratory responses to isometabolic exercise

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dc.contributor.authorAndrade, Marilia dos Santos [UNIFESP]
dc.contributor.authorLira, Claudio Andre Barbosa de
dc.contributor.authorVancini, Rodrigo Luiz [UNIFESP]
dc.contributor.authorNakamoto, Fernanda Patti [UNIFESP]
dc.contributor.authorCohen, Moises [UNIFESP]
dc.contributor.authorSilva, Antonio Carlos da [UNIFESP]
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.contributor.institutionUniversidade Federal de Goiás Faculty of Physical Education Department of Human and Exercise Physiology
dc.contributor.institutionUniversidade Federal do Espírito Santo Center for Physical Education and Sport
dc.date.accessioned2015-06-14T13:47:06Z
dc.date.available2015-06-14T13:47:06Z
dc.date.issued2014-05-16
dc.description.abstractObjectives: To investigate whether the muscle strength decrease that follows anterior cruciate ligament (ACL) reconstruction would lead to different cardiorespiratory adjustments during dynamic exercise.Method: Eighteen active male subjects were submitted to isokinetic evaluation of knee flexor and extensor muscles four months after ACL surgery. Thigh circumference was also measured and an incremental unilateral cardiopulmonary exercise test was performed separately for both involved and uninvolved lower limbs in order to compare heart rate, oxygen consumption, minute ventilation, and ventilatory pattern (breath rate, tidal volume, inspiratory time, expiratory time, tidal volume/inspiratory time) at three different workloads (moderate, anaerobic threshold, and maximal).Results:There was a significant difference between isokinetic extensor peak torque measured in the involved (116.5±29.1 Nm) and uninvolved (220.8±40.4 Nm) limbs, p=0.000. Isokinetic flexor peak torque was also lower in the involved limb than in the uninvolved limb (107.8±15.4 and 132.5±26.3 Nm, p=0.004, respectively). Lower values were also found in involved thigh circumference as compared with uninvolved limb (46.9±4.3 and 48.5±3.9 cm, p=0.005, respectively). No differences were found between the lower limbs in any of the variables of the incremental cardiopulmonary tests at all exercise intensities.Conclusions: Our findings indicate that, four months after ACL surgery, there is a significant deficit in isokinetic strength in the involved limb, but these differences in muscle strength requirement do not produce differences in the cardiorespiratory adjustments to exercise. Based on the hypotheses from the literature which explain the differences in the physiological responses to exercise for different muscle masses, we can deduce that, after 4 months of a rehabilitation program after an ACL reconstruction, individuals probably do not present differences in muscle oxidative and peripheral perfusion capacities that could elicit higher levels of peripheral cardiorepiratory stimulus during exercise.en
dc.description.affiliationUniversidade Federal de São Paulo (UNIFESP) Department of Physiology
dc.description.affiliationUniversidade Federal de Goiás Faculty of Physical Education Department of Human and Exercise Physiology
dc.description.affiliationUniversidade Federal do Espírito Santo Center for Physical Education and Sport
dc.description.affiliationUniversidade Federal de São Paulo (UNIFESP) Department of Orthopedics and Traumatology
dc.description.affiliationUnifespUNIFESP, Department of Physiology
dc.description.affiliationUnifespUNIFESP, Department of Orthopedics and Traumatology
dc.description.sourceSciELO
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIDFAPESP: 99/07746-9
dc.format.extent144-151
dc.identifierhttp://dx.doi.org/10.1590/S1413-35552012005000153
dc.identifier.citationBrazilian Journal of Physical Therapy. Associação Brasileira de Pesquisa e Pós-Graduação em Fisioterapia , v. 18, n. 2, p. 144-151, 2014.
dc.identifier.doi10.1590/S1413-35552012005000153
dc.identifier.fileS1413-35552014000200144.pdf
dc.identifier.issn1413-3555
dc.identifier.scieloS1413-35552014000200144
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/8382
dc.identifier.wosWOS:000337944500006
dc.language.isoeng
dc.publisherAssociação Brasileira de Pesquisa e Pós-Graduação em Fisioterapia
dc.relation.ispartofBrazilian Journal of Physical Therapy
dc.rightsAcesso aberto
dc.subjectrehabilitationen
dc.subjectanterior cruciate ligamenten
dc.subjectisokinetic testingen
dc.subjectphysical therapyen
dc.subjectoxygen uptakeen
dc.subjectventilatory responseen
dc.titleDifferences in muscle strength after ACL reconstruction do not influence cardiorespiratory responses to isometabolic exerciseen
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