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Jeju National University, Department of Rehabilitation Medicine1, Severance Hospital, Yonsei University College of Medicine, Department and Research Institute of Rehabilitation Medicine2, Hannam University, Department of Sports Sciences3 |
Objectives: to investigate the effects of unbalancing bicycle ergometer exercise on cardio-cerebral hemodynamics and muscle activation in hemiplegic stroke patients.
Methods: Thirteen young male volunteers (23.4±2.5 yrs) were enrolled in this study from January, 2019 to June, 2019. They were asked to perform the incremental bicycle ergometer exercise (SRH100H®,NanoBioLife Inc, Seoul, Korea) (Monark Ergometer 881®, Varberg, Sweden) in the upright and 45° recumbent (R) postures with a week interval, respectively.
Balancing protocol was set initially at 50W and increased by 25W every 2 minutes to 150W and unbalancing protocol was set to maximal different exercise intensity bilaterally. (45W vs 150W)
CBFV in middle cerebral artery (MCA) (SONARA Transcranial Doppler ultrasound®, VIASYS Co. Ltd., USA) and arterial stiffness including cardio ankle vascular index (CAVI) , ankle brachial index (ABI) and augmentation index (AIx) (VaSera VS-2000 instrument®, Fukuda Denshi Co. Ltd., Tokyo, Japan) were measured at rest, 5 minutes, 10 minutes during exercise and 10 minutes recovery. EMG data (PolyG-A, LAXTHA Inc, Daejeon, Korea) were recorded from the volunteers’ lower limb muscles (rectus femoris (RF), semitendinosus, tibialis anterior, and medial gastrocnemius muscles). EMG signals were normalized to the highest EMG signals recorded for the maximum voluntary isometric contractions (MVIC). The peak normalized EMG value, (root mean square, RMS) of the studied muscles over the average of the 10 pedal cycles was analyzed. Cardiovascular responses [(cardiac output (CO), heart rate (HR), stroke volume (SV)] were also measured,
Results: Unbalancing protocol induced significantly lower RMS of rectus femoris than balacing exercise (p<0.05), but another muscles did not show significant differences. There was no significant differences in cerebral blood flow velocity and CO between two protocols.
Conclusion. The unbalancing bicycle ergometer exercise in recumbent position induced low muscle activity in RF but it does not decrease cardio-cerebral blood flow. Therefore, it might suggest basic data for the development of bicycle exercise program and therapeutic approaches of hemiplegic stroke patients. |
