Effects of an Acute and Chronic Training Protocol Associated to the Inter-set Velocity Loss

May 24, 2019 updated by: Alejandro Muñoz López

Neuromuscular, Physiological and Performance Changes After an Acute and Chronic Training Protocol Associated to the Inter-set Velocity Loss

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.

Study Overview

Status

Unknown

Conditions

Intervention / Treatment

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.

Study Type

Interventional

Enrollment (Anticipated)

30

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 30 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

Male

Description

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

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Other
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: 20% velocity loss
This group will train with a variable number of repetitions during each set. The group will stop the set once the mean propulsive velocity will be 20% less compared to the first repetition.
Other: Acute 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.
Other: Chronic 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.
Other: Familiarization
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
Experimental: 40% velocity loss
This group will train with a variable number of repetitions during each set. The group will stop the set once the mean propulsive velocity will be 40% less compared to the first repetition.
Other: Acute 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.
Other: Chronic 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.
Other: Familiarization
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
Placebo Comparator: Control group
This group will be just tested as a control group.
Other: Chronic 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.
Other: Familiarization
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

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Contraction time
Time Frame: 7 weeks
Time between 10% to 90% on the displacement-time curve assessed with the Tensiomiograhpy
7 weeks
Maximum displacement
Time Frame: 7 weeks
Maximum displacement point the displacement-time curve assessed with the Tensiomiograhpy
7 weeks

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Kinetic variables in the jump
Time Frame: 7 weeks
Kinetic variables related to the force-time curve registered with the force platform during jumps
7 weeks
Muscle tissue oxygen
Time Frame: 7 weeks
Oxygen in the muscle tissue assessed via near-infrared spectroscopy
7 weeks
Muscle temperature
Time Frame: 7 weeks
Low limb muscles temperature assessed with a termographic camera
7 weeks
Mean propulsive velocity
Time Frame: 7 weeks
Individual repetitions mean propulsive velocity during the full squat exercise, assessed with a linear encoder
7 weeks
Amplitude (RMS) and frequency outputs
Time Frame: 7 weeks
Muscle electrical activity assessed with an EMG
7 weeks
Peak isometric force
Time Frame: 7 weeks
Maximum force achieved during a knee extension at 120º
7 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Alejandro Muñoz López

Investigators

  • Study Director: Alejandro Muñoz López, PhD, Internship
  • Principal Investigator: Jesus Gustavo Ponce, PhD, Professor

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Anticipated)

July 1, 2019

Primary Completion (Anticipated)

August 30, 2019

Study Completion (Anticipated)

September 15, 2019

Study Registration Dates

First Submitted

May 23, 2019

First Submitted That Met QC Criteria

May 23, 2019

First Posted (Actual)

May 28, 2019

Study Record Updates

Last Update Posted (Actual)

May 29, 2019

Last Update Submitted That Met QC Criteria

May 24, 2019

Last Verified

May 1, 2019

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • TMG_velocity_lost

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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