Nordic Hamstring and Repeated-sprint Ability in Football (Soccer) Players

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

35 participants

Study Classification

INTERVENTIONAL

Study Start Date

2016-02-29

Study Completion Date

2016-06-30

Brief Summary

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The purpose of the study is to investigate the efficacy of a 10-week intervention, using the Nordic Hamstring exercise, on repeated-sprint ability in male sub-elite football players. The primary outcome measure is total sprint time during 4x6 sprint of 10 meters measured using dual-beam photoelectric cells. Additionally, eccentric knee flexor strength is measured using the Nordbord hamstring strength measure. The hypothesis is that strength training of the knee flexor muscles elicited by the Nordic Hamstring exercise will result in enhanced repetitive sprint-ability expressed as a decrease in total sprint time. Furthermore, baseline data is used to assess to correlation between eccentric hamstring strength and active hamstring flexibility AND sprint performance.

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Detailed Description

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Conditions

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Repeated-sprint Ability

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

OTHER

Blinding Strategy

SINGLE

Outcome Assessors

Study Groups

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Nordic Hamstring

The Nordic Hamstring group performs a progressive strengthening program (Mjolsnes et al., 2004) comprising of the Nordic Hamstring exercise during a period of 10 weeks. The training load increases from one session per week in week 1 to 3 sessions per week in week 3-10. Number of sets and repetitions progressively increase from 2 to 3 and 5 to 12, respectively. The exercise program is performed in the end of a regular football training session.

Group Type EXPERIMENTAL

Nordic Hamstring

Intervention Type OTHER

Control

The control group are asked not to perform the exercise or any other specific strength training for the hamstring muscles and to continue to play football as usual.

Group Type OTHER

Control

Intervention Type OTHER

Interventions

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Nordic Hamstring

Intervention Type OTHER

Control

Intervention Type OTHER

Other Intervention Names

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Hamstring lowers Nordic lowers Hamstring Curl

Eligibility Criteria

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Inclusion Criteria

* Sub-elite Danish football player
* Age 17-35.
* Able to participate fully in competitive football activities at the time of testing

Exclusion Criteria

* Hamstring pain resulting in loss of training and matches 2 months prior to study initiation.
* Specific systematic strength training of the hamstring muscles (\>1/week) in the preceding 2 months before study initiation.
* Specific systematic sprint training (\>1/week) in the preceding 2 months before study initiation.
* Longstanding injury (\>6 weeks) in the lower extremities in the preceding 6 months to study initiation.

Minimum Eligible Age

17 Years

Maximum Eligible Age

35 Years

Eligible Sex

MALE

Accepts Healthy Volunteers

Yes