Magnitude or Direction? Seasonal Variation of Interlimb Asymmetry in Elite Academy Soccer Players

Bishop, Chris; Read, Paul; Chavda, Shyam; Jarvis, Paul; Brazier, Jon; Bromley, Tom; Turner, Anthony N.

doi:10.1519/jsc.0000000000003565

Cited by 60 publications

(122 citation statements)

References 31 publications

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“…Loud verbal encouragement was consistently provided to ensure maximum effort. If the jump test instructions were not respected (quiet standing period for 1-2 s before the start, hands on hips all time, take-off leg(s) fully extended during flight phase, no swing of the contralateral leg in CMJ UL ), the subject was asked to repeat the jump [6]. Data from the force plates were sampled at 1000 Hz and low pass filtered with a Butterworth filter (10 Hz cut-off frequency, 2nd order).…”

Section: Bilateral and Unilateral Countermovement Jumpmentioning

confidence: 99%

“…Inter-limb asymmetry (ILA), which refers to the difference in performance or function of one limb relative to the other [1], has been a popular topic in recent years. Numerous methods of assessment have been used to quantify ILA, ranging from the back squat [2] and isokinetic dynamometry [3] for strength, bilateral and unilateral countermovement (CMJ BL and CMJ UL ) and drop jumps [4][5][6][7] for jumping, and the "505" test [8] for change of direction (CoD) speed. These methods have been a common choice for assessing ILA in athlete populations, owing to the importance of strength [9], power [10] and CoD speed [11] performance in sport.…”

Section: Introductionmentioning

confidence: 99%

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Strength, Jumping and Change of Direction Speed Asymmetries in Soccer, Basketball and Tennis Players

et al. 2020

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Despite growing research in the field of inter-limb asymmetries (ILAs), little is known about the variation of ILAs in different populations of athletes. The purpose of this study was to compare ILAs among young basketball, soccer and tennis players. ILAs were assessed in three different types of tests (strength, jumping and change of direction (CoD) speed), each including different tasks: (1) bilateral and unilateral counter movement jump, (2) isometric strength of knee extensors (KE) and knee flexors (KF), and (3) 90° and 180° CoD. Generally, the absolute metrics showed strong reliability and revealed significant differences (p < 0.05) among the three groups in KE maximal torque, KE and KF rate of force development and in both CoD tests. For jumping ILAs, power and force impulse metrics exhibited significant between-limb differences between groups, compared to jump height. For strength and CoD speed ILAs, only KF maximal torque and 180° CoD exhibited significant differences between groups. Greater KF strength ILAs in soccer players and counter-movement jump ILAs in tennis players are most probably the result of sport-specific movement patterns and training routines. Sport practitioners should be aware of the differences in ILAs among sports and address training programs accordingly.

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Section: Bilateral and Unilateral Countermovement Jumpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strength, Jumping and Change of Direction Speed Asymmetries in Soccer, Basketball and Tennis Players

et al. 2020

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“…One reason might be the different roles of the legs during movements: one is dominant for stabilization and support, and one for mobilization (e.g., propulsion or braking) and manipulation (e.g., kicking), altogether possibly causing inter-limb asymmetries [20,35,53]. Moreover, there may also be differences in the fatigability of the limbs [23,30,37,[54][55][56] and the direction of asymmetries [57]. Therefore, a consideration of laterality is advisable.…”

Section: Lateralitymentioning

confidence: 99%

“…To obtain comparable results, we suggest using one of these equations depending on the type of task employed (i.e., unilateral or bilateral). Moreover, it might be helpful to regard not only the magnitude of asymmetry but also their direction to obtain insights on the underlying mechanisms and the influence of fatigue on limb dominance and asymmetries [57].…”

Section: Calculation Of Asymmetriesmentioning

confidence: 99%

“…between the limbs should be regarded. At least a more individual approach might be the best method to assess the injury risk of an athlete [67] because group means do not provide sufficient information [57]. In this respect, intra-limb variability should be considered, and the coefficient of variance of the test should also be calculated to quantify if the measured asymmetry is "real" [25,68].…”

Section: Calculation Of Asymmetriesmentioning

confidence: 99%

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The Influence of Exercise-Induced Fatigue on Inter-Limb Asymmetries: a Systematic Review

2020

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Background Non-contact injuries such as anterior cruciate ligament ruptures often occur during physical load toward the end of a match. This is ascribed to emerging processes due to exercise-induced fatigue. Moreover, non-contact injuries often occur during dynamic actions such as landing or cutting movements. Inter-limb asymmetries are suggested as one possible cause for those injuries based on findings indicating that asymmetries between limbs are associated with a higher injury risk. Hence, assessing inter-limb asymmetry during physical load in the condition of exercise-induced fatigue is warranted to identify potentially relevant precursors for non-contact injuries. Objective The objective of this study was to overview the current state of evidence concerning the influence of exercise-induced fatigue on inter-limb asymmetries through a systematic review. Methods A systematic literature search was conducted using the databases Web of Science, Scopus, PubMed, SURF, and SPONET to identify studies that assessed inter-limb asymmetries of healthy people, calculated with an asymmetry equation, before and after, or during a loading protocol. Results Thirteen studies were included in the systematic review. The loading protocols involved running, race walking, jumping, squatting, soccer, rowing, and combinations of different exercises. Moreover, different tasks/procedures were used to assess inter-limb asymmetries, e.g., squats, single-leg countermovement jumps, gait analysis, or isokinetic strength testing. The results seem to depend on the implemented loading protocol, the tasks/procedures, and the measured parameters. Conclusions Future research needs more systematization and consistency, assessing the effect of exercise-induced fatigue on inter-limb asymmetries. Moreover, the emergence of inter-limb asymmetries should be regarded in the context of sport-specific movements/tasks. Testing before, after, and during a physical loading protocol is advisable to consider the influence of exercise-induced fatigue on sport-specific tasks and to identify the possible mechanisms underlying load-dependent inter-limb asymmetries with regard to risk of non-contact injury.

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The Effects of a Unilateral Strength and Power Training Intervention on Inter-Limb Asymmetry and Physical Performance in Male Amateur Soccer Players

Bettariga

Maestroni

Jarvis

et al. 2022

J. of SCI. IN SPORT AND EXERCISE

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Magnitude or Direction? Seasonal Variation of Interlimb Asymmetry in Elite Academy Soccer Players

Cited by 60 publications

References 31 publications

Strength, Jumping and Change of Direction Speed Asymmetries in Soccer, Basketball and Tennis Players

Strength, Jumping and Change of Direction Speed Asymmetries in Soccer, Basketball and Tennis Players

The Influence of Exercise-Induced Fatigue on Inter-Limb Asymmetries: a Systematic Review

The Effects of a Unilateral Strength and Power Training Intervention on Inter-Limb Asymmetry and Physical Performance in Male Amateur Soccer Players

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