Acute Effects of Static Stretching in Warm-up

NCT03298789 | Completed

• 1 other identifier: UP-FVZ-StretchingEffects
• Study Type: interventional
• Target: 19
• Locations: 1 country
• Sites: 1

Brief Summary

In this study the investigators want to address acute effects of warm-up and static stretching on short-term muscular performance of football players. Static stretching exercises are often used in the first part of a training session or before a football match in order to increase sports performance and to decrease risk of injuries. Since there is a lot of scientific evidence that demonstrates static stretching can improve short-term muscle performance, the aim of researchers is to discover the size and the duration of negative effects and, additionally, whether these effects can be eliminated with activation exercises. Nineteen 14 years old football players will be included in a cross-over study design. In the control condition the participants will perform 5 minutes of aerobic warm-up (stepping on the stair) and then 7 series of 20-seconds static stretching of quadriceps femoris, hamstrings, hip adductors and triceps surae. Maximal power and jump height of the countermovement jump will be tested in between every series. Thus, parameters of countermovement jump will be monitored at the beginning, after warm-up, after each series of static stretching, 7.5 minutes after 7th static stretching series and 15 minutes after 7th static stretching series. Parameters of dynamometry (relative maximal torque \[Nm/kgBM\] and rate of torque developement \[Nm/s/kgBM\] will be monitored at the beginning, after warm up, 7.5 minutes after last series of static stretching and 15 minutes after last series of static stretching. Maximal range of motion will be monitored at the beginning, after warm up, during every series of static stretching, after last series of static stretching, 7.5 minutes after last series of static stretching and 15 minutes after last series of static stretching. In the second condition (experimental) all the tasks are the same, the only difference is that the subjects must perform post-activation potentiation exercises after last series of static stretching. We hypothesize that muscular performance will be impaired to a statistically significant level after 7th series of static stretching. Second hypothesis is that negative effects will not last longer than 15 minutes and the last hypothesis is that static stretching induced negative effects can be nullified with activation exercises.

Conditions

Only Healthy Participants Are Included in the Study

Keywords

static stretching; muscle power; countermovement jump; dynamometry; warm up; force plate

Outcome Measures

Primary Outcomes (1)

• Muscle Performance

  Maximal and explosive strength of adductors, maximal power during countermovement jump

  1 week

Secondary Outcomes (5)

• Maximal power during countermovement jump

  1 week

• Jump Height

  1 week

• Relative maximal torque of adductors on dynamometer (Nm/kgBM)

  1 week

• Rate of torque developement (Nm/s/kgBM)

  1 week

• Maximal range of motion (cm)

  1 week

Study Arms (2)

Experimental condition

EXPERIMENTAL

7 series of static stretching will be conducted in the experimental condition. Activation exercises will be performed after 7th series of static stretching.

Other: Activation exercise; Other: 7 series of static stretching

Control

OTHER

7 series of static stretching will be conducted in the control condition.

Other: 7 series of static stretching

Interventions

Activation exercise OTHER

Two series of 4 activation exercise will be included in the intervention.

Experimental condition

7 series of static stretching OTHER

7 series of 4 20 seconds static stretches will be conducted.

Control; Experimental condition

Eligibility Criteria

• Age: 12 Years - 15 Years
• Sex: male
• Healthy Volunteers: Yes
• Age Groups: Child (0-17)

You may qualify if:

• football players, man

You may not qualify if:

• injuries, last 12 months

Sponsors & Collaborators

• University of Primorska: lead
• S2P, Science to Practice, Ltd.: collaborator
• Motus Melior, Ltd.: collaborator

Study Sites (1)

Faculty of Health Studies, University of Primorska

Izola, Polje 42, 6310, Slovenia

Location

Study Officials

• Nejc Sarabon, PhD

  University of Primorska, Faculty of Health Studies, Izola, Slovenia

  STUDY DIRECTOR

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: BASIC SCIENCE
• Intervention Model: CROSSOVER
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Assoc. Prof. Dr. Sc.

Model Details: 19 subjects will be devided into two groups. The first group will conduct the control condition on Saturday and the second group will conduct the experimental condition on Sunday. One week later, the subjects will undergo the second visit, each group of subjects performing the opposite condition.

Study Record Dates

• First Submitted: August 3, 2017
• First Posted: October 2, 2017
• Study Start: July 22, 2017
• Primary Completion: July 23, 2017
• Study Completion: July 30, 2017
• Last Updated: October 2, 2017

Record last verified: 2017-09

Locations

SL (1)