Healthy
Conditions
Keywords
velocity loss, Tensiomiography, resistance training
Brief summary
This study evaluates different performance, physiological and neuromuscular changes after acute and chronic resistance training intervention in physically active men. The participants will train with a single exercise (full squat) and will be monitored with a linear encoder. The experiment will consist of between 3 to 6 sets between 70% to 85% of 1RM in the full squat exercise. Two main groups will form the intervention: one group will perform inter-set repetitions until there will be a 20% of velocity loss compared to the first repetition, while the second group will have a 40% of velocity loss.
Detailed description
The main dependent variables and instruments will be: 1. Tensyomiography: neuromuscular properties of the vastus lateral (VL), rectus femoris (RF) and vastus medialis (VM) from the dominant leg. 2. Force platform: kinetic variables in relation to a countermovement jump. 3. Near-infrared spectrography: oxygen saturation in the VL and VM. 4. Termographic camera: low limbs temperatura. 5. Linear encoder: mean propulsive velocity from each repetition 6. Electromyography: amplitude and frequency parameters related to a knee extension maximum voluntary contraction test. 7. Strain gauge: maximum isometric force.
Interventions
OTHERAcute changes
In a crossover design, participants will be randomized to perform on Day 1, 3 sets of repetitions (depending on each treatment group) at 70% or 1RM in the full squat exercise. 48-h later, same will be performed but in the contrary crossover arm.
OTHERChronic changes
In a randomized control trial, participants will train during 6 weeks the full squat exercise, 2 days in the week (minimum between-days rest of 48h). Intensity will vary from 70% to 85 of 1RM, and training volume from 3 to 6 sets.
OTHERFamiliarization
Prior to any intervention, all participants will perform a familiarization of the exercise session, together with a progressive resistance test to estimate the 1 RM
Sponsors
Alejandro Muñoz López
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
OTHER
Masking
SINGLE (Subject)
Eligibility
Sex/Gender
MALE
Age
18 Years to 30 Years
Healthy volunteers
Yes
Inclusion criteria
* To be healthy * Without injuries or actual illnesses * More than 2 years of experience in resistance training or federative sports
Exclusion criteria
* To be sick or injured * To have programmed during the intervention phase a dramatic change in the lifestyle
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Contraction time | 7 weeks | Time between 10% to 90% on the displacement-time curve assessed with the Tensiomiograhpy |
| Maximum displacement | 7 weeks | Maximum displacement point the displacement-time curve assessed with the Tensiomiograhpy |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Muscle temperature | 7 weeks | Low limb muscles temperature assessed with a termographic camera |
| Mean propulsive velocity | 7 weeks | Individual repetitions mean propulsive velocity during the full squat exercise, assessed with a linear encoder |
| Kinetic variables in the jump | 7 weeks | Kinetic variables related to the force-time curve registered with the force platform during jumps |
| Peak isometric force | 7 weeks | Maximum force achieved during a knee extension at 120º |
| Amplitude (RMS) and frequency outputs | 7 weeks | Muscle electrical activity assessed with an EMG |
| Muscle tissue oxygen | 7 weeks | Oxygen in the muscle tissue assessed via near-infrared spectroscopy |
Contacts
Primary ContactJesus Gustazo Ponce, PhD
Backup ContactAlejandro Muñoz López, PhD
Outcome results
None listed