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

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

Author Andrade, Marilia dos Santos Autor UNIFESP Google Scholar
Lira, Claudio Andre Barbosa de Google Scholar
Vancini, Rodrigo Luiz Autor UNIFESP Google Scholar
Nakamoto, Fernanda Patti Autor UNIFESP Google Scholar
Cohen, Moises Autor UNIFESP Google Scholar
Silva, Antonio Carlos da Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Universidade Federal de Goiás Faculty of Physical Education Department of Human and Exercise Physiology
Universidade Federal do Espírito Santo Center for Physical Education and Sport
Abstract Objectives: 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.
Keywords rehabilitation
anterior cruciate ligament
isokinetic testing
physical therapy
oxygen uptake
ventilatory response
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Grant number FAPESP: 99/07746-9
Date 2014-05-16
Published in Brazilian Journal of Physical Therapy. Associação Brasileira de Pesquisa e Pós-Graduação em Fisioterapia , v. 18, n. 2, p. 144-151, 2014.
ISSN 1413-3555 (Sherpa/Romeo, impact factor)
Publisher Associação Brasileira de Pesquisa e Pós-Graduação em Fisioterapia
Extent 144-151
Origin http://dx.doi.org/10.1590/S1413-35552012005000153
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000337944500006
SciELO ID S1413-35552014000200144 (statistics in SciELO)
URI http://repositorio.unifesp.br/handle/11600/8382

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