Comparação do efeito do período de recuperação da fadiga muscular no andar entre adultos jovens e idosos

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) ; Processo FAPESP: 2013/12774-0 ; The effects of muscle fatigue on motor control of the gait are age-dependent. Also, it is known that the strength and the quality of muscle contraction decline with the advance of the age, impaired the motor control of gait and daily activities. However, studies about the effects of the muscle fatigue recovery time on gait in old adults are scarce. The aim of the study was to compare the effects of different recovery periods (5, 10 and 20 minutes) after muscle fatigue of quadriceps in gait among young and old adults. Forty young adults with age between 20 and 40 years old and forty older adults with age above sixty years old were enrolled in the study. Participants performed the following tasks: i) walking task: participants performed 3 trials in selfselected velocity in a 8 meters long pathway; ii) maximal voluntary contraction protocol: it was performed in a leg press machine. They performed 2 trials for each period; iii) fatigue induction protocol: the quadriceps fatigue was induced by the sit-tostand task until voluntary exhaustion; iv) participants repeated the first and the second items immediately after the fatigue induction and after 5, 10 and 20 minutes of rest. In the walking task was analyzed the central stride of each participant in each trial. It was analyzed the kinematic (stride length, step width, double support percentage, stride velocity and stride duration), kinetics (anteroposterior and vertical braking and propulsive impulses) and electromyographic (RMS and peak of electromyographic activity of the medial and lateral vastus, biceps femoral, medial and lateral gastrocnemius and tibialis anterior). Data were compared by MANOVAs two-way with factor group (young adults X older adults) and recovery period (before muscle fatigue X after muscle fatigue X 5 minute recovery X 10 minutes recovery X 20 minutes recovery) with repeated measures to the last factor. In general, the results show that muscle ...