Intra- and Inter-Limb Strength Asymmetry in Soccer: A Comparison of Professional and Under-18 Players

Bishop, Chris; Coratella, Giuseppe; Beato, Marco

doi:10.3390/sports9090129

Cited by 16 publications

(35 citation statements)

References 44 publications

(86 reference statements)

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“…Regarding SI, peak torque, mean power, and total work of knee flexor muscle in both groups were > 10%, and only in the older group SI peak torque of knee extensor muscle showed the same value. The SI peak torque of knee extensor muscle in the older group found in our study differs from previous studies where values under 10% were found in the elite academy and professional male soccer players (Beato et al, 2021;Bishop, Coratella, et al, 2021). In addition, SI peak torque of knee flexor muscle differs from previous studies where values under 10% were found in professional adult male soccer players (Bishop, Coratella, et al, 2021).…”

Section: Discussioncontrasting

confidence: 99%

Age-dependent Knee Joint Isokinetic Profile in Professional Male Soccer Players

Torres-Banduc

Jerez‐Mayorga

Ojeda

et al. 2022

IJKSS

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Background: The knee-joint isokinetic profile (KJIP) injury risk factor may be modulated by chronological age, however, comparative data for elite male soccer players aged 25 years and older is lacking. Objective: To describe and compare the knee-joint isokinetic profile (KJIP) according to the chronological age of professional male soccer players. Method: In a cross-sectional study design, sixty-three soccer athletes from the first Chilean soccer division (A-series) were divided into younger and older groups (age ≤ 25 years; n = 35 and age 25 years; n = 28, respectively). In both groups the IPKJ was assessed at 60°.s-1 in concentric mode. Results: The older group had lower extensor peak torque (p .05). The younger group showed correlations between flexors peak torque and extensors mean power (p .001). In the older group, flexors peak torque and flexors mean power were correlated. The flexors peak torque, total work, and mean power symmetric index (SI) exhibited values 10 % for both groups. The extensors SI showed values 10 % for mean power, although only in the older group. Conclusion: Several differences in the KJIP were noted between professional male soccer players aged ≤ 25 years and 25 years. Current results offer injury prevention insights, discussed in the current manuscript.

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Section: Discussioncontrasting

confidence: 99%

Age-dependent Knee Joint Isokinetic Profile in Professional Male Soccer Players

Torres-Banduc

Jerez‐Mayorga

Ojeda

et al. 2022

IJKSS

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“…Soccer practices and competitions induce asymmetries. However, these adaptations tend to increase in non-professional players as well as players with intermediate and short training age (Fousekis et al, 2010b;Bishop et al, 2021). Thus, these asymmetries might have influenced the asymmetric results found in the pivot shift maneuver in our study.…”

Section: Discussionmentioning

confidence: 68%

Is the Rotatory Knee Stability Immediately Decreased Following a Competitive Soccer Match?

Neira

Silvestre

Debandi

et al. 2022

Front. Bioeng. Biotechnol.

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Fatigue induced by soccer playing increases physical efforts, which might alter the transverse knee stability, a known factor that promotes knee injuries, particularly anterior cruciate ligament injury. Thereby, primarily, we aimed to determine whether rotatory knee stability decreases immediately following a competitive soccer match in amateur players. Furthermore, we assessed the role of the preferred and non-preferred limbs to kick a ball in rotatory knee stability and the correlation between performance parameters and rotatory knee stability. We hypothesized that the knee stability decreases immediately after a competitive soccer match in amateur players. Eight healthy amateur soccer players (aged 27.2 ± 4.7 years and with body mass index of 23.8 ± 1.2 kg m−2) were included immediately before and after a competitive soccer match. The rotatory knee stability was assessed in the preferred and non-preferred limbs through the acceleration and jerk of the pivot shift maneuver and by the internal knee rotation of a pivoting landing task. Two-way repeated-measures ANOVA for factors time (before and after the soccer match) and limb (preferred and non-preferred) and multiple comparisons were performed using α = 5%. There was a statistical significance for the main factor time in the acceleration (5.04 vs. 6.90 ms−2, Δ = 1.86 ms−2, p = 0.020, η2 = 0.331) and jerk (18.46 vs. 32.10 ms−2, Δ = 13.64 ms−2, p = 0.004, η2 = 0.456) of the pivot shift maneuver. Rotatory stability decreases following a competitive soccer match in amateur soccer players under fatigue. Both the acceleration and jerk during the pivot shift maneuver is increased without significant internal knee rotation changes during the pivoting landing task.

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“…When considering absolute reliability however, all CV values were ,10% between test sessions-noting just a slightly elevated value between sessions 1-2 of 10.06%. Given 10% is commonly used as a threshold to determine acceptable levels of absolute reliability during testing (5,6,9,15), it seems that there may have been a very small learning effect across data collection sessions, as CV values improved throughout the weeks. However, practitioners should be mindful that this elevated CV value of 10.06% between sessions 1-2 was only slightly over the accepted 10% threshold, with this value dropping below 10% between sessions 2-3.…”

Section: Discussionmentioning

confidence: 99%

“…The magnitude of asymmetry was calculated using the formula: (dominant/non-dominant)/total 3 100, as per suggestions by Bishop et al (8) when using bilateral tests, with the dominant limb being defined as the preferred kicking limb for each player. Previous research on this topic has used the Kappa coefficient to determine the direction of asymmetry between test sessions (5)(6)(7)17); however, this statistic is sensitive to large alterations in the outcome if sample sizes are small (35). Thus, levels of agreement for the direction of asymmetry were reported as a percentage of the total sample between each subsequent test session.…”

Section: Statistical Analysesmentioning

confidence: 99%

Assessing Eccentric Hamstring Strength Using the NordBord: Between-Session Reliability and Interlimb Asymmetries in Professional Soccer Players

Bishop

Manuel

Drury

et al. 2022

Journal of Strength and Conditioning Research

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The aims of the current study were to (a) determine between-session reliability of peak force during the Nordic hamstring exercise (NHE) in professional soccer players during the preseason and (b) determine the subsequent magnitude and direction of peak force asymmetry from the NHE between all test sessions. The NHE was used as a weekly monitoring tool in 14 professional soccer players, throughout a 6-week pre-season period to record peak force from the NordBord device (in Newtons-N) across an average of 6 repetitions for the dominant and nondominant limbs. The first 2 weeks were used as familiarization sessions, with 4 data collection sessions thereafter. When considering relative reliability, intraclass correlation coefficients (ICCs) showed moderate levels of between-session reliability across the 4 weeks on both limbs (dominant 5 0.54-0.73 and nondominant 5 0.68-0.73) and for the sum total (0.69-0.73). For absolute reliability, both limbs showed coefficient of variation (CV) values ,10% across all 4 weeks, with the exception of the dominant limb between sessions 1-2 (10.06%). When determining systematic bias, no meaningful changes were evident in peak force on either limb (g 5 20.59 to 0.40) or for the magnitude of asymmetry (g 5 20.24 to 0.35). However, when assessing consistency in the direction of asymmetry, levels of agreement ranged from 43 to 57% across the data collection period, indicating substantial variation in the superior performing limb from session to session. The findings from this study indicate that 2 familiarization sessions is enough to elicit reliable peak force data during the NHE in professional soccer players during preseason, despite a very small learning effect across the testing period.

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Intra- and Inter-Limb Strength Asymmetry in Soccer: A Comparison of Professional and Under-18 Players

Cited by 16 publications

References 44 publications

Age-dependent Knee Joint Isokinetic Profile in Professional Male Soccer Players

Age-dependent Knee Joint Isokinetic Profile in Professional Male Soccer Players

Is the Rotatory Knee Stability Immediately Decreased Following a Competitive Soccer Match?

Assessing Eccentric Hamstring Strength Using the NordBord: Between-Session Reliability and Interlimb Asymmetries in Professional Soccer Players

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