Electrical Stimulation
Conditions
Keywords
Electrical stimulation, M wave, H reflex, Wide pulse
Brief summary
This study aims to evaluate on an acute session of the central and peripheral contributions of electrical stimulation on the muscle belly of the triceps surae, electrical stimulation of the tibial nerve and voluntary exercise of the triceps surae muscle, and identify responders individuals and non-responders to stimulation of the tibial nerve. Another objective of the study is to compare the effects of conventional electrical stimulation applied to the sciatic triceps muscle, tibial nerve stimulation and voluntary exercise after eight weeks of training in healthy individuals.
Detailed description
A controlled randomized controlled trial will be carried out by university students, divided equally into four groups: control group (GC), long responding pulse group (PLR), non-responder long pulse group (PLNR) and pulsed current group (CP) after the acute fase of the protocol. Muscular architecture (muscle thickness, pennation angle and fascicle length) of the muscles composing the sural triceps, H-reflex and M-wave tests (central and peripheral contribution), electromyographic signals of the medial and lateral gastrocnemius muscles and sole, voluntary and evoked joint torque of the muscles composing the sural triceps and level of sensorial discomfort. The independent intervention with the neuromuscular electrical stimulation and the isometric exercises performed by the control group will be considered as an independent variable. All groups will have the dependent variables evaluated 6 times, before, during and after the intervention, which will consist of 24 sessions (8 weeks). The training with neuromuscular electrical stimulation (NMES) will be performed 3 times a week and will never be applied for two consecutive days, as well as the voluntary exercises performed by the control group.
Interventions
OTHERVoluntary exercise
The participants will perform 36 maximal voluntary contractions, 3 times per week for 8 weeks.
OTHERWide pulse responder group
The participants will perform 36 contractions with the following current parameters: pulsed current (100 Hz, pulse duration 1 ms, Ton: 6 s, Toff: 18 s), 3 times per week for 8 weeks. This group will be classified in responder group in acute fase.
OTHERWide pulse non responder group
The participants will perform 36 contractions with the following current parameters: pulsed current (100 Hz, pulse duration 1 ms, Ton: 6 s, Toff: 18 s), 3 times per week for 8 weeks. This group will be classified in non responder group in acute fase.
OTHERPulsed current group
The participants will perform 36 contractions with the following current parameters: pulsed current (100 Hz, pulse duration 250 μs, Ton: 6 s, Toff: 18 s), 3 times per week for 8 weeks.
Sponsors
University of Burgundy
University of Brasilia
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
MALE
Age
18 Years to 30 Years
Healthy volunteers
Yes
Inclusion criteria
* Classified as physically active according to the INTERNATIONAL QUESTIONNAIRE OF PHYSICAL ACTIVITY, * To practice only recreational physical activity, * Achieve minimum torque of 30% of the (maximal voluntary isometric contraction during conventional NMES * Be at least 3 months without practicing strength training.
Exclusion criteria
* Present some type of skeletal muscle dysfunction that may interfere with the tests, * Present intolerance to NMES in the muscular or tibial nerve, Make use of analgesics, antidepressants, tranquillizers or other agents of central action * To present cardiovascular or peripheral vascular problems, chronic diseases, neurological or muscular affections that will undermine the complete execution of the study design by the volunteer.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change from Baseline Electromyographic signals after 8 weeks of training with electrical stimulation | Baseline and after 8 weeks of training with electrical stimulation | Electromyographic signals will be evaluated by an electromyography before and after an 8-week training period with electrical stimulation. |
| Change from Baseline Peripheral contribution (M wave) after 8 weeks of traning with electrical atimulation | Baseline and after 8 weeks of training with electrical stimulation | Peripheral contribution will be measured before and after 8 weeks of training with electrical stimulation. |
| Change from Baseline Voluntary torque after 8 weeks of training with electrical stimulation | Baseline and after 8 weeks of training with electrical stimulation | Voluntary torque will be evaluated by an isokinetic dynamometer before and after an 8-week training period with electrical stimulation. |
| Change from Baseline Central contribution (H reflex) after 15 minutes of acute session of electrical stimulation. | Baseline and after 15 minutes of electrical stimulation in the acute session. | Central contribution will be measured before and after 15 minutes (36 contractions) of electrical stimulation in the acute session. |
| Change from Baseline Central contribution (H reflex) after 8 weeks of training with electrical stimulation. | Baseline and after 8 weeks of training with electrical stimulation. | Central contribution will be measured before and after 8 weeks of training with electrical stimulation. |
| Change from Baseline Peripheral contribution (M wave) after 15 minutes of acute session of electrical stimulation | Baseline and after 15 minutes of electrical stimulation in the acute session | Peripheral contribution will be measured before and after acute session 15 minutes (36 contractions) of electrical stimulation in the acute session. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Change from Baseline Discomfort sensory after 8 weeks of training with electrical stimulation | Baseline and after 8 weeks of training with electrical stimulation | Discomfort sensory will be evaluated by Visual Analogic Scale before and after an 8-week training period with electrical stimulation. The Visual Analogic Scale assess pain by rating the subjective perceived disconfort of the subject from 0 (no pain) to 10 (unbearable pain) |
| Change from Baseline Evoked torque after 8 weeks of training with electrical stimulation | Baseline and after 8 weeks of training with electrical stimulation | Evoked torque will be evaluated by an isokinetic dynamometer before and after an 8-week training period with electrical stimulation. |
Countries
Brazil
Outcome results
None listed