Rate of Leg Curl to Leg Press During Isokinetic Testing

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

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.

Study Overview

• Status: Completed
• Conditions: Muscle Strain
• Intervention / Treatment: Device: Isokinetic leg extension/-flexion on a legpress device; Device: Isokinetic leg extension/-flexion on a legcurl device

• Study Type: Interventional
• Enrollment (Actual): 28
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Germany
  • Erlangen, Germany, 91052
    • Institute of Medical Physics, University of Erlangen-Nurnberg

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 35 years (Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: Male

Description

Inclusion Criteria:

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

Exclusion Criteria:

• no acute injuries

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Diagnostic
• Allocation: Randomized
• Interventional Model: Crossover Assignment
• Masking: Single

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: leg curl device starters; Group A randomly assigned to start with legcurl device	Device: Isokinetic leg extension/-flexion on a legpress device; Maximum strength and rate of leg-flexion /-extension during legpress exercise; Device: Isokinetic leg extension/-flexion on a legcurl device; Maximum strength and rate of leg-flexion /-extension during legcurl exercise
Experimental: legpress device starters; Group A randomly assigned to start with legpress device	Device: Isokinetic leg extension/-flexion on a legpress device; Maximum strength and rate of leg-flexion /-extension during legpress exercise; Device: Isokinetic leg extension/-flexion on a legcurl device; Maximum strength and rate of leg-flexion /-extension during legcurl exercise

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Leg extension/leg-flexion rate	Rate of leg extension to leg-flexion	at baseline

Secondary Outcome Measures

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

Collaborators and Investigators

• Sponsor: University of Erlangen-Nürnberg Medical School
• Investigators: Study Chair: Wolfgang Kemmler, PhD, Institute of Medical Physics, University of Erlangen-Nurnberg, Germany

Study record dates

Study Major Dates

• Study Start (Actual): August 15, 2018
• Primary Completion (Actual): February 15, 2019
• Study Completion (Actual): May 15, 2019

Study Registration Dates

• First Submitted: May 23, 2019
• First Submitted That Met QC Criteria: May 25, 2019
• First Posted (Actual): May 29, 2019

Study Record Updates

• Last Update Posted (Actual): May 31, 2019
• Last Update Submitted That Met QC Criteria: May 29, 2019
• Last Verified: May 1, 2019

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Wounds and Injuries; Sprains and Strains
• Other Study ID Numbers: IMP_Test

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: No

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No