Clinical trial NCT03964519: Effects of an Acute and Chronic Training Protocol Associated to the Inter-set Velocity Loss
Official title: Neuromuscular, Physiological and Performance Changes After an Acute and Chronic Training Protocol Associated to the Inter-set Velocity Loss
Study type: INTERVENTIONAL
Overall status: UNKNOWN
Phase: NA
Conditions: Healthy
Keywords: velocity loss
Tensiomiography
resistance training
Lead sponsor: University of Seville
Sponsor class: OTHER
First posted: 2019-05-28
Enrollment: 30
Sex: MALE
Minimum age (years): 18
Maximum age (years): 30
Standard ages: ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: CROSSOVER
Primary purpose: OTHER

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.

Eligibility criteria: 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

Primary outcomes:
measure: Contraction time
timeFrame: 7 weeks
measure: Maximum displacement
timeFrame: 7 weeks
Secondary outcomes:
measure: Kinetic variables in the jump
timeFrame: 7 weeks
measure: Muscle tissue oxygen
timeFrame: 7 weeks
measure: Muscle temperature
timeFrame: 7 weeks
measure: Mean propulsive velocity
timeFrame: 7 weeks
measure: Amplitude (RMS) and frequency outputs
timeFrame: 7 weeks
measure: Peak isometric force
timeFrame: 7 weeks
Other outcomes:
Locations:
Study officials:
affiliation: Internship
name: Alejandro Muñoz López, PhD
role: STUDY_DIRECTOR
affiliation: Professor
name: Jesus Gustavo Ponce, PhD
role: PRINCIPAL_INVESTIGATOR
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