Quantification of Eccentric Hamstrings Strength in Elite Academy Footballers: Considerations for Assessment

Rhodes, David; Greig, Matt; Jeffrey, Josh; Alexander, Jill

doi:10.18276/cej.2022.3-01

Cited by 2 publications

(1 citation statement)

References 32 publications

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“…Frontiers in Physiology frontiersin.org reported by Rhodes et al (2022). Per the protocol described by Drury et al (2020), players kneeled on the board with their ankles fixed by an individual hook for each leg (uniaxial load cell), hips fully extended, and arms across the chest.…”

Section: Eccentric Strength Of Knee Flexorsmentioning

confidence: 99%

Relationships of lower extremity and trunk asymmetries in elite soccer players

Maly,

Hank,

Verbruggen

et al. 2024

Front. Physiol.

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In light of previous research highlighting the prevalence of asymmetries in soccer players and possible links to injury risks, there is a crucial gap in the biomechanical understanding of complex relationships between lower extremity and trunk asymmetries in elite soccer players. The purpose of this study was to investigate the level, relationships, and differences among twelve different parameters of strength, morphological, and neuromuscular asymmetries in elite soccer players.Methods: Elite male soccer players (n = 25, age 21.7 ± 3.9 years) were tested in the following tests: bilateral fluid distribution, hip flexor range of motion, postural stability, isokinetic strength of knee extensors and flexors, isometric lateral trunk rotation strength, eccentric strength of knee flexors, isometric bilateral strength of hip adductors, and vertical ground reaction force in counter-movement jump-free arms, counter-movement jump, squat jump, and drop jump tests. One-way ANOVA, Pearson’s coefficient (r), and partial eta squared (ηp2) were used for data analysis.Results: Significant differences in asymmetries were found in elite soccer players (F11,299 = 11.01, p < .01). The magnitude of asymmetry over 10% was in postural stability and drop jump parameters. The lowest magnitudes of asymmetries were in the fluid distribution of the lower limbs and the vertical ground reaction force during the take-off phase in squat jumps. The highest asymmetries between the dominant and non-dominant sides were found in postural stability and drop jump. A total of eleven significant correlations (p < 0.05, r = 0.41–0.63, R2 = 0.17–0.40) were detected between the analyzed asymmetries in elite soccer players. The lateral trunk rotation asymmetries were significantly correlated to vertical ground reaction force asymmetries and knee extensors.Conclusion: Long-term exposure in elite soccer leads to unilateral biomechanical loading that induces abnormal strength and morphological adaptations in favor of the dominant side while linking lower limb and trunk strength asymmetries. By unraveling these complex relationships, we strive to contribute novel methods that could inform targeted training regimens and injury prevention strategies in the elite soccer community. The data should encourage future researchers and coaches to monitor and develop trunk strength linked to lower body kinematics.

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Section: Eccentric Strength Of Knee Flexorsmentioning

confidence: 99%

Relationships of lower extremity and trunk asymmetries in elite soccer players

Maly,

Hank,

Verbruggen

et al. 2024

Front. Physiol.

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The Nordbord usefulness in football: a systematic review of the pros and cons

Koukouras,

Tere,

Koukouras

et al. 2024

Hum Mov.

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Since 2016 and the introduction of Nordbord to the world, a variety of sports and disciplines have used the device to inform everyday decision-making, such as post-match recovery, to assess players’ readiness for the next fixture and mitigate the risk of injury. The objective of this paper was to examine the use of Nordbord across all football (soccer) levels and present practical recommendations concerning its application and potential limitations as a tool for measuring eccentric strength of the knee flexors (ESKF) incorporating the critical role of hamstring eccentric strength (HES) in injury prevention and performance enhancement. Twenty-nine studies were identified and met the inclusion criteria. The review shows that although Nordbord has potential as a practical and cost-effective method of measuring HES, the findings on the validity and reliability are conflicting. Furthermore, the study highlights several topics where the Nordbord could be recommended to stakeholders, as a tool to assess post-match recovery, prevention of hamstring injuries, and rehabilitation, as well as used as a performance indicator for balance, sprint, and change of direction performance. However, the review showed that ESKFs could be affected by fatigue and training volume, therefore, there is a need for normative values for different ages, genders, levels, and positions. Furthermore, the need for standardized methods and normalized data gathering, are argued as pivotal points to establish the Nordbord as a valuable alternative to the isokinetic dynamometer.

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Quantification of Eccentric Hamstrings Strength in Elite Academy Footballers: Considerations for Assessment

Cited by 2 publications

References 32 publications

Relationships of lower extremity and trunk asymmetries in elite soccer players

Relationships of lower extremity and trunk asymmetries in elite soccer players

The Nordbord usefulness in football: a systematic review of the pros and cons

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