Assessment of functional impairment after knee anterior cruciate ligament reconstruction using cardiorespiratory parameters: a cross-sectional study
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2014
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Background: A dynamic sub-maximum exercise with the same absolute intensity, performed with different muscle
groups, may present exacerbated cardiorespiratory responses. Therefore, cardiorespiratory responses to unilateral
exercise may identify bilateral differences. The purpose of this study was to verify whether the cardiorespiratory
responses to lower limb exercise display counter-lateral differences, and if they could be used to assist athletes and
health professionals involved in rehabilitation.
Methods: Nine individuals participated in this cross-sectional study. They had been treated in a private rehabilitation
clinic and submitted to intra-articular reconstruction of the anterior cruciate ligament. The cycling exercise with the
same sub-maximal intensity and with one lower limb was used to gather data. Cardiorespiratory responses to exercise
were compared between exercises performed with the involved and uninvolved limb after five minutes of exercise.
Results: Cardiorespiratory responses to exercise performed with the involved limb presented higher values after five
minutes of cycling: oxygen uptake (+7%), carbon dioxide production (+10%) , minute ventilation (+20%), breathing
frequency (+19%), ventilatory equivalent for oxygen (+14%), end-tidal pressure of O 2 oxygen (+4%), end-tidal pressure
of O 2 carbon dioxide (−9%) and heart rate (+9%).
Conclusions: The exacerbated responses, including increase of the ventilatory equivalent and decrease of end-tidal
pressure of carbon dioxide , indicate that this exercise protocol may be useful in the characterization of the functional
deficit of the surgical limb during rehabilitation.
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Palavras-chave
Knee injury rehabilitation, Oxygen uptake, Physiological responses, Heart rate
Citação
ANDRADE, Marília Santos et al. Assessment of functional impairment after knee anterior cruciate ligament reconstruction using cardiorespiratory parameters: a cross-sectional study. BMC Musculoskeletal Disorders, London, v. 15, n. 163, p. 1-5, 2014.