Neuromuscular Adaptations
Conditions
Keywords
Strength training, Neuromuscular adaptation
Brief summary
This study aims to apply a novel study methodology using high density electromyography (HDEMG) to know what are the mechanisms underlying the structural and functional changes obtained by two different training methods, commonly used, facilitating their understanding, study and subsequent application according to specific needs.
Detailed description
Different training methodologies have previously shown similar results in the improvement of structural or functional characteristics such as hypertrophy or strength. However, the different nature of their methods has suggested for years the possibility that different neuromuscular mechanisms could be behind these observed characteristics. The development of a new technology, such as high-density electromyography (HDEMG), capable of studying new properties previously hidden from assessment methods, such as the speed of nerve impulse propagation or the frequency of motor unit discharge, has allowed a more thorough study of the mechanisms. This study aims to apply this new study methodology to know what are the mechanisms underlying the changes at the structural and functional level obtained by two different training methods, commonly used, facilitating their understanding, study and subsequent application according to specific needs. For this reason, the main hypothesis is the generation of different neuromuscular mechanisms and adaptations by executing, for 4 weeks, two different training methodologies, obtaining a dissociation between the results obtained at the structural level (hypertrophy), functional (generation of strength) and HDEMG analysis of the central and peripheral characteristics of the neuromuscular system in each of the programs studied.
Interventions
OTHERSpeed Loss 20% Strength Training
Strength training based on the control of speed loss in execution.
OTHERReduced Rest Time Strength Training
Strength training based on a protocol that includes reduced rest times between sets.
Sponsors
University of Malaga
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
OTHER
Masking
SINGLE (Outcomes Assessor)
Masking description
The assessor will not be aware of the group to which each subject has been assigned.
Intervention model description
Two randomly allocated parallel groups
Eligibility
Sex/Gender
MALE
Age
18 Years to 35 Years
Healthy volunteers
Yes
Inclusion criteria
* 18-35 years * men
Exclusion criteria
* physical exercise that involves work of upper limbs during the time of the intervention * upper limb injury during the previous 12 months * systemic diseases
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change from Baseline Mean Discharge Rate of Brachialis Biceps Motor Units at 4 weeks | Baseline and post-intervention (4 weeks after baseline) | The mean discharge rate of the Brachialis Biceps motor units will be evaluated using a high density electromyography device (HDEMG). For this, the signal produced during isometric contractions at different submaximal force levels (10, 30, 50, and 70%) will be recorded, using an external analog to digital signal converter Sessantaquattro (64-channel EMG amplifier; OT Bioelettronica, Turin, Italy). |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Speed of propagation of Brachialis Biceps Motor Units | Baseline and post-intervention (4 weeks after baseline) | As a measure of evaluation of the peripheral characteristics of the neuromuscular system, the propagation speed of the action potentials produced by an HDEMG device will be evaluated. For this, the signal produced during isometric contractions at different submaximal force levels (10, 30, 50, and 70%) will be recorded, using the external analog to digital signal converter Sessantaquattro |
| Isometric force of Brachialis Biceps using hand dynamometer | Baseline and post-intervention (4 weeks after baseline) | The isometric force at 0º, 45º and 90º will be evaluated during a maximum test of 5 seconds using a digital manual dynamometer. The peak force obtained will be obtained. |
| Isometric force of Brachialis Biceps using s-beam load cell | Baseline and post-intervention (4 weeks after baseline) | The isometric force at 90º will also be evaluated through an S-type load cell (Biometrics Ltd., Newport, United Kingdom). In addition, the time needed to obtain the peak force achieved will be recorded. |
| Muscle thickness (thickness) of the brachial biceps using ultrasound | Baseline and post-intervention (4 weeks after baseline) | Structural changes will be evaluated through an innocuous procedure such as ultrasound. To do this, ultrasound images will be recorded to measure the muscular and adipose thickness of the arm musculature. |
| Arm circumference | Baseline and post-intervention (4 weeks after baseline) | A variable related to structural changes such as arm circumference will also be evaluated. For this, the circumference will be recorded through a measuring tape at the average distance between the acromion and the olecranon. |
Countries
Spain
Outcome results
None listed