The Effect of Body Mass on Eccentric Knee-Flexor Strength Assessed With an Instrumented Nordic Hamstring Device (Nordbord) in Football Players
| Autor: | Nicholas Poulos, Martin Buchheit, Yannick Cholley, Mark Nagel |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Adult
Male medicine.medical_specialty Knee Joint Football Physical Therapy Sports Therapy and Rehabilitation Hamstring Muscles Body Mass Index 03 medical and health sciences Young Adult 0302 clinical medicine Risk Factors Medicine Eccentric Humans Orthopedics and Sports Medicine Muscle Strength 030222 orthopedics Football players business.industry 030229 sport sciences Confidence interval Athletes Athletic Injuries Physical therapy Exercise Test business Knee flexor Hamstring |
| Zdroj: | International journal of sports physiology and performance. 11(6) |
| ISSN: | 1555-0273 |
| Popis: | Purpose:To examine the effect of body mass (BM) on eccentric knee-flexor strength using the Nordbord and offer simple guidelines to control for the effect of BM on knee-flexor strength.Methods:Data from 81 soccer players (U17, U19, U21, senior 4th French division, and professionals) and 41 Australian Football League (AFL) players were used for analysis. They all performed 1 set of 3 maximal repetitions of the bilateral Nordic hamstring exercise, with the greatest strength measure used for analysis. The main regression equation obtained from the overall sample was used to predict eccentric knee-flexor strength from a given BM (moderate TEE, 22%). Individual deviations from the BM-predicted score were used as a BM-free index of eccentric knee- flexor strength.Results:There was a large (r = .55, 90% confidence limits .42;.64) correlation between eccentric knee-flexor strength and BM. Heavier and older players (professionals, 4th French division, and AFL) outperformed their lighter and younger (U17–U21) counterparts, with the soccer professionals presenting the highest absolute strength. Professional soccer players were the only ones to show strength values likely slightly greater than those expected for their BM.Conclusions:Eccentric knee-flexor strength, as assessed with the Nordbord, is largely BM-dependent. To control for this effect, practitioners may compare actual test performances with the expected strength for a given BM, using the following predictive equation: Eccentric strength (N) = 4 × BM (kg) + 26.1. Professional soccer players with specific knee-flexor-training history and enhanced neuromuscular performance may show higher than expected values. |
| Databáze: | OpenAIRE |
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