Interference of Endurance Training on Strength Development and Neuromuscular Adaptations
Overview
- Phase
- Not Applicable
- Intervention
- Not specified
- Conditions
- Exercise
- Sponsor
- University of Lisbon
- Enrollment
- 30
- Locations
- 1
- Primary Endpoint
- H-reflex excitability
- Status
- Active, not recruiting
- Last Updated
- last year
Overview
Brief Summary
This study aims to find out if performing combined strength and endurance exercise in the same program (called concurrent training-CT) leads to similar long-term improvements in neuromuscular function as doing each type of exercise separately. The main questions it seeks to answer are:
Does performing CT result in similar improvements in strength and power as doing just strength training? Does performing CT result in similar improvements in cardiorespiratory fitness as doing just endurance training? Are neuromuscular adaptations similar between CT and just strength training? Researchers will compare the results between three groups: the CT group, the endurance training group (E), and the strength training group (S) to answer these questions.
Detailed Description
This study looks at how different types of exercise affect neuromuscular and cardiorespiratory improvements over time. It aims to see how combining strength and endurance training (concurrent training - CT) affects neuromuscular and cardiorespiratory adaptations compared to doing just strength or endurance training. Participants who regularly do both types of exercise will be split into three groups: Concurrent training (CT), endurance training (E), or strength training (S) and will be involved in 11 weeks of supervised training, three days a week: Endurance training involves 30 minutes of continuous running, three days a week, at an intensity corresponding to the heavy domain (between the first and second ventilatory threshold) Strength training includes weightlifting three days a week, focusing on building both strength and power. Concurrent training incorporates both strength and endurance exercises in the same session, three days a week, with strength training being executed prior to endurance training. Researchers will collect data at three time-points during the 11 weeks: before starting the program (Baseline), at the end of week 5 (Week 5), and at the end of the program (Week 11). Measurements include lower-body strength and power, aerobic capacity, nerve evoked responses, and muscle structure if the quadriceps femoris. Researchers will then compare the CT, E, and S groups at each measurement point to see which type of training elicited the best adaptations for the different neuromuscular and cardiorespiratory outcomes.
Investigators
Miguel Gomes
Invited Assistant Professor
University of Lisbon
Eligibility Criteria
Inclusion Criteria
- •Active training status (strength and endurance (running) exercise at least 2 times per week over the last three months prior to inclusion in the study)
Exclusion Criteria
- •Active smoking status
- •Orthopedic injuries
- •On medication
- •Known cardiovascular or respiratory disease
Outcomes
Primary Outcomes
H-reflex excitability
Time Frame: Baseline, Week 5, Week 11
Using percutaneous electrostimulation of the tibial nerve, spinal reflex excitability will be explored by assessing H-reflex evoked responses
Lower Body Muscle Power
Time Frame: Baseline, Week 5, Week 11
Lower body muscle power in watts will be assessed during countermovement jumps
Maximal Isometric Strength
Time Frame: Baseline, Week 5, Week 11
Maximal voluntary isometric strength of the plantarflexors and leg press exercise in Newtons
Muscle fascicle length
Time Frame: Baseline, Week 5, Week 11
Fascicle length of the vastus lateralis muscles in centimeters
Muscle fascicle pennation angle
Time Frame: Baseline, Week 5, Week 11
Pennation angle of the vastus laterais fascicles, in degrees
V-wave
Time Frame: Baseline, Week 5, Week 11
Using percutaneous electrostimulation of the tibial nerve, neural drive to the active muscle will be assessed by measuring V-wave amplitudes
Muscle thickenss
Time Frame: Baseline, Week 5, Week 11
Muscle thickenss of the vastus lateralis, in centimeters
Maximal Dynamic Strength
Time Frame: Baseline, Week 5, Week 11
Maximal dynamic strength on the back squat exercise in kilograms lifted
Surface EMG
Time Frame: Baseline, Week 5, Week 11
Using surface electromyography (EMG), the muscle activation of the plantarflexors muscles will me assessed, as well as the quadriceps femoris during the leg press and back squat exercise