Rate of Leg Curl to Leg Press During Isokinetic Testing

Not Applicable

Completed

• Conditions: Muscle Strain
• Interventions: Device: Isokinetic leg extension/-flexion on a legpress device; Device: Isokinetic leg extension/-flexion on a legcurl device

• Registration Number: NCT03966690
• Lead Sponsor: University of Erlangen-Nürnberg Medical School

Brief Summary

The functional condition of the leg muscles is not only relevant to performance in sports, but is also of great importance in health, prevention and rehabilitation, where not only the general strength level is decisive but also the relationship between individual muscle groups. Among other things the H-Q-ratio (strength ratio of "hamstring" muscles to quadriceps muscles) is often used to diagnose possible imbalances. Isokinetic force measurements have established themselves as the gold standard in competitive football. In this context, however, force tests in the open kinetic chain (OKC) have almost exclusively been used so far. Especially force measurements in the closed kinetic chain (CKC) could have a higher relevance regarding functionality. The H-Q-ratio should better be called the flex-ext-ratio in the CKC due to the involvement of the hip muscles. There is little data in the literature on leg force or flex-ext-ratio in CKC. In particular, there is hardly any comparative data for isokinetic measurement systems in the CKC. Using a cross over design and randomly allocating 28 competitive football players into two groups (n=14 each) that either started tests with the leg press or legcurl device, the investigators assumed (1) a significantly lower flex-ext-ratio in the CKC compared to the OKC, (2) a correlation between the isokinetic measurement systems in the OKC and the CKC, and (3) a significant superiority of the leg press to predict functional performance of the lower limbs.

Detailed Description

Not available

Study Timeline

• Study Start: 2018-08-15
• Primary Completion: 2019-02-15
• Status Verified: 2019-05
• Study Completion: 2019-05-15
• Study First Submitted: 2019-05-23
• Study First Submitted QC: 2019-05-25
• Study First Posted: 2019-05-29
• Last Update Submitted: 2019-05-29
• Last Update Posted: 2019-05-31

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Male
• Target Recruitment: 28

Inclusion Criteria

• male elite soccer players (5th-6th German soccer division)

Exclusion Criteria

• no acute injuries

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
legpress device starters	Isokinetic leg extension/-flexion on a legcurl device	Group A randomly assigned to start with legpress device
leg curl device starters	Isokinetic leg extension/-flexion on a legpress device	Group A randomly assigned to start with legcurl device
leg curl device starters	Isokinetic leg extension/-flexion on a legcurl device	Group A randomly assigned to start with legcurl device
legpress device starters	Isokinetic leg extension/-flexion on a legpress device	Group A randomly assigned to start with legpress device

Primary Outcome Measures

Name	Time	Method
Leg extension/leg-flexion rate	at baseline	Rate of leg extension to leg-flexion

Secondary Outcome Measures

Name	Time	Method
Isokinetic leg flexors strength	at baseline	Maximum isokinetic strength of the leg flexors as determined by an isokinetic legpress device (Physiomed, Laipersdorf, Germany)
Isokinetic leg extensors strength	at baseline	Maximum isokinetic strength of the leg extensors as determined by an isokinetic legpress device (Physiomed, Laipersdorf, Germany)
Y-Balance Test	at baseline	Dynamic motor-control as determined by the Y-Balance test
Maximum jumping height	at baseline	Maximum jumping height as determined by the counter movement jump

Trial Locations

Locations (1)

Institute of Medical Physics, University of Erlangen-Nurnberg; 🇩🇪 Erlangen, Germany