Hemodynamic responses to neuromuscular electrical stimulation and to metaboreflex activation
| Autor: | Aline C de Macedo, Vinícius M Alves, Andressa S.O. Schein, Paula M Zambeli, Graciele Sbruzzi, Carine Cristina Callegaro, Beatriz D'Agord Schaan |
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| Rok vydání: | 2022 |
| Předmět: |
Adult
medicine.medical_specialty Hemodynamics Physical Therapy Sports Therapy and Rehabilitation Isometric exercise Peco Heart Rate Internal medicine medicine Humans Orthopedics and Sports Medicine Muscle Skeletal Cross-Over Studies business.industry Blood flow Middle Aged Electric Stimulation Blood pressure Mean blood pressure medicine.anatomical_structure Circulatory system Vascular resistance Cardiology Female business |
| Zdroj: | The Journal of Sports Medicine and Physical Fitness. 62 |
| ISSN: | 1827-1928 0022-4707 |
| DOI: | 10.23736/s0022-4707.21.11877-8 |
| Popis: | Background Metabolites produced during muscle exercise can sensitize types III and IV fibers, which account for increasing blood pressure (BP) and vascular resistance in non-exercising limbs, as well as for redistributing the blood flow to active muscles; reflex response is called metaboreflex. Neuromuscular electrical stimulation (NMES) induces greater local muscle metabolic demand than voluntary isometric contractions. Metabolic accumulation is essential to activate muscle metaboreflex; thus, the hypothesis of the current study is that one NMES session can induce metaboreflex with different hemodynamic responses in upper and lower limbs. Objective: investigating whether one acute NMES session could activate metaboreflex by inducing different hemodynamic responses between arms and legs. Methods Twenty (20) healthy subjects (mean age = 47.7 ± 9.4 years, 13 women, mean body mass index = 26±3.4kg/m2) participated in this randomized crossover study. All participants were subjected to two NMES interventions, one in the upper limbs (UPL) and the other in the lower limbs (LL). Mean blood pressure (MBP), blood flow (BF) and vascular resistance (VR) at baseline were used to selectively evaluate metaboreflex responses during NMES interventions and recovery periods with, and without, postexercise circulatory occlusion (PECO+ and PECO-, respectively) through the area under the curve (AUC) in VR. Results MBP increased by 13% during UPL interventions and only remained high during PECO+. Changes in MBP were not observed in LL, although BF in the contralateral leg has decreased by 14% during PECO+ protocol. Muscle metaboreflex activation (AUC differences in VR between PECO+ and PECO-) was not different between UPL and LL (p=0.655). Conclusions Acute NMES session has induced similar metaboreflex activation in both arms and legs, although hemodynamic responses differed between interventions. |
| Databáze: | OpenAIRE |
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