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



Título del documento: Differences in muscle strength after ACL reconstruction do not influence cardiorespiratory responses to isometabolic exercise
Revista: Brazilian journal of physical therapy
Base de datos: PERIÓDICA
Número de sistema: 000380171
ISSN: 1809-9246
Autores: 1
2
3
1
4
1
Instituciones: 1Universidade Federal de Sao Paulo, Departamento de Fisiologia, Sao Paulo. Brasil
2Universidade Federal de Goias, Faculdade de Educacao Fisica, Goiania, Goias. Brasil
3Universidade Federal do Espirito Santo, Centro de Educacao Fisica e Desportos, Vitoria, Espirito Santo. Brasil
4Universidade Federal de Sao Paulo, Departamento de Ortopedia e Traumatologia, Sao Paulo. Brasil
Año:
Periodo: Mar-Abr
Volumen: 18
Número: 2
Paginación: 144-151
País: Brasil
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Experimental
Resumen en inglés 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..
Disciplinas: Medicina
Palabras clave: Fisiología humana,
Terapéutica y rehabilitación,
Traumatología y ortopedia,
Ligamento cruzado anterior,
Reconstrucción,
Fuerza muscular,
Terapia física,
Ejercicios isocinéticos,
Captación de oxígeno,
Respuesta ventilatoria
Keyword: Medicine,
Human physiology,
Therapeutics and rehabilitation,
Traumatology and orthopedics,
Anterior cruciate ligament,
Reconstruction,
Muscular strength,
Physical therapy,
Isokinetic exercises,
Oxygen uptake,
Ventilatory response
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