Electromyographic comparison of elastic resistance versus machine exercise for high-intensity strength training in chronic stroke patients

Tidsskriftartikel - 2016

Resume

OBJECTIVE: To investigate whether elastic resistance training can induce comparable levels of muscle activity as conventional machine training in chronic stroke patients. DESIGN: Comparative study SETTING: Outpatient rehabilitation facility PARTICIPANTS: 18 stroke patients with hemiparesis (mean age 57 (SD: 8) years). INTERVENTIONS: Patients performed 3 consecutive reps at 10 repetition maximum (RM) of unilateral knee extension- and flexion, using elastic resistance and conventional training machines. MAIN OUTCOME MEASURE: Surface electromyography (EMG) was measured in vastus lateralis (VL), vastus medialis (VM), biceps femoris (BF) and semitendinosus (ST), and normalized to the maximal EMG (nEMG) of the non-paretic leg. RESULTS: In the paretic leg, agonist muscle activity ranged from 18-24% nEMG during knee flexion and 32-40% nEMG during knee extension. For the latter, VL nEMG was higher during machine exercise compared with elastic resistance (40% [95% CI 33 - 47] vs 32% [95% CI 25 - 39], P=0.003). In the non-paretic leg, agonist muscle activity ranged from 54-61% during knee flexion and 52-68% during knee extension (n.s.). For knee flexion, ST nEMG was higher (61% [95% CI 50 - 71] vs 54% [95% CI 44 - 64], P=0.016), and for knee extension VM nEMG was higher (68% [95% CI 60 - 76] vs 56% [95% CI 48 - 64], P

Reference

Vinstrup J, Calatayud JMV, Jakobsen MD, Sundstrup EH, Jay K, Brandt M, Zeeman P, Jørgensen J, Andersen LL. Electromyographic comparison of elastic resistance versus machine exercise for high-intensity strength training in chronic stroke patients. Archives of Physical Medicine and Rehabilitation 2016;97(3):429-436.
doi: 10.1016/j.apmr.2015.10.099

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