Rate of Leg Curl to Leg Press During Isokinetic Testing

Muscle Strain Clinical Trial

Official title:

Maximum Strength and Ratio of Leg Extension and Leg Flexion in Elite Soccer Players. A Comparison of an Open Versus Closed Isokinetic System

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03966690
• Other study ID #: IMP_Test
• Status: Completed
• Phase: N/A
• Start date: August 15, 2018
• Est. completion date: May 15, 2019

Study information

• Verified date: May 2019
• Source: University of Erlangen-Nürnberg Medical School
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial 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.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 28
• Est. completion date: May 15, 2019
• Est. primary completion date: February 15, 2019
• Accepts healthy volunteers: No
• Gender: Male
• Age group: 18 Years to 35 Years

Eligibility

Inclusion Criteria:

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

Exclusion Criteria:

• no acute injuries

Related Conditions & MeSH terms

• Muscle Strain

Intervention

Device:
• Isokinetic leg extension/-flexion on a legpress device
Maximum strength and rate of leg-flexion /-extension during legpress exercise
• Isokinetic leg extension/-flexion on a legcurl device
Maximum strength and rate of leg-flexion /-extension during legcurl exercise

Locations

Country	Name	City	State
Germany	Institute of Medical Physics, University of Erlangen-Nurnberg	Erlangen

Sponsors (1)

Lead Sponsor	Collaborator
University of Erlangen-Nürnberg Medical School

Country where clinical trial is conducted

Germany, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Leg extension/leg-flexion rate	Rate of leg extension to leg-flexion	at baseline
Secondary	Isokinetic leg extensors strength	Maximum isokinetic strength of the leg extensors as determined by an isokinetic legpress device (Physiomed, Laipersdorf, Germany)	at baseline
Secondary	Isokinetic leg flexors strength	Maximum isokinetic strength of the leg flexors as determined by an isokinetic legpress device (Physiomed, Laipersdorf, Germany)	at baseline
Secondary	Y-Balance Test	Dynamic motor-control as determined by the Y-Balance test	at baseline
Secondary	Maximum jumping height	Maximum jumping height as determined by the counter movement jump	at baseline