Acute Effects of a Fatiguing Protocol on Peak Force and Rate of Force Development of the Hamstring Muscles in Soccer Players

Bettariga, Francesco; Bishop, Chris; Turner, Anthony N.; Lazzarini, Stefano Giuseppe; Algeri, Cristiano; Maestroni, Luca

doi:10.1007/s42978-023-00228-x

“…Currently, the methods used for single joint isometric assessments using force plates has limited consistency, 5,9,27,30,35,36 with variations in the test set up where hip and knee angles of 30À30 and standing 90À20 have been used with force plates. Despite this consistently demonstrated sensitivity to detect change following a fatiguing activity in both PF and RFD.…”

Section: Discussionmentioning

confidence: 99%

Photovoice as an unfamiliar act of citizenship: everyday belonging, place-making and political subjectivity

Biglin

¹

2022

Citizenship Studies

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The aim of this investigation was to determine the reliability of normalizing rapid force (RF) production to peak force assessed during an isometric knee flexor assessment, and to present a novel method of classifying athletes' potential training needs within the 90À90 isometric hamstring assessment. Procedures: Twenty elite female soccer players (age: 20.7 § 4.7 years; height: 168.2 § 5.5 cm; body mass: 62.8 § 7.0 kg), with no recent (>6 months) history of hamstring strain injury, volunteered to participate in the study. Following a standardized warm-up, each participant performed three maximal isometric hamstring contractions, with their heel resting on a force plate, elevated on a box, to ensure that their hips and knees were at 90°Data was analyzed to determine peak for (PF), RF was established as force expressed at 100 ms (F100) and force expressed at 200 ms (F200), with force at each time-point subsequently normalized to a percentage of PF. Findings: F100 and F200 normalized to PF demonstrated good absolute reliability (%CV = 6.12À7.62) and moderate relative reliability (ICC = 0.689À0.703). Concurrently observing PF and normalized F100 and F200 could provide clear training and monitoring goals. Conclusions: Normalizing measures of RF production, including F100 and F200, to PF can be performed reliability. Therefore, could be tracked overtime to identify changes as an effect of training or for fatigue monitoring purposes. However, further research is required to determine how knee flexor force-time characteristics change in relation to focused training and how these characteristics change in response to fatiguing activities.

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“…Currently, the methods used for single joint isometric assessments using force plates has limited consistency, 5,9,27,30,35,36 with variations in the test set up where hip and knee angles of 30À30 and standing 90À20 have been used with force plates. Despite this consistently demonstrated sensitivity to detect change following a fatiguing activity in both PF and RFD.…”

Section: Discussionmentioning

confidence: 99%

“…Despite this consistently demonstrated sensitivity to detect change following a fatiguing activity in both PF and RFD. 5,9,27 Within the present study, only the 90À90 isometric hamstring assessment was used, despite high reliability and the potential for practitioners to use the information for appropriate prescription for EST or MST. The 90À90 isometric hamstring assessment may lack specificity to the mechanism of HSI, which are proposed to occur at longer muscle lengths within the descending limb of the force-length curve.…”

Section: Discussionmentioning

confidence: 99%

Sociocultural Conflicts and Ottoman Settlement Policies at the Balkan Wars

Bilecen

¹

,

Sirkeci

²

2021

Journal of Balkan and Near Eastern Studies

1

0

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The aim of this investigation was to determine the reliability of normalizing rapid force (RF) production to peak force assessed during an isometric knee flexor assessment, and to present a novel method of classifying athletes' potential training needs within the 90À90 isometric hamstring assessment. Procedures: Twenty elite female soccer players (age: 20.7 § 4.7 years; height: 168.2 § 5.5 cm; body mass: 62.8 § 7.0 kg), with no recent (>6 months) history of hamstring strain injury, volunteered to participate in the study. Following a standardized warm-up, each participant performed three maximal isometric hamstring contractions, with their heel resting on a force plate, elevated on a box, to ensure that their hips and knees were at 90°Data was analyzed to determine peak for (PF), RF was established as force expressed at 100 ms (F100) and force expressed at 200 ms (F200), with force at each time-point subsequently normalized to a percentage of PF. Findings: F100 and F200 normalized to PF demonstrated good absolute reliability (%CV = 6.12À7.62) and moderate relative reliability (ICC = 0.689À0.703). Concurrently observing PF and normalized F100 and F200 could provide clear training and monitoring goals. Conclusions: Normalizing measures of RF production, including F100 and F200, to PF can be performed reliability. Therefore, could be tracked overtime to identify changes as an effect of training or for fatigue monitoring purposes. However, further research is required to determine how knee flexor force-time characteristics change in relation to focused training and how these characteristics change in response to fatiguing activities.

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“…These angular positions should be taken into consideration when designing tests to assess HSS with the goal of preventing HSI. Therefore, the objective and user-friendly assessment of HSS via mobile force plate or sphygomanometer under knee and hip flexion angles of 30° [20,[22][23][24][25][26] or under 90° of hip and 20° of knee flexion [27], respectively, was proposed in the past. Assessing hamstring strength under a hip and knee flexion of 30° each [20,[22][23][24] or 90° and 20° [27], respectively, led to a larger sensitivity to detect hamstring muscle fatigue than tests under 90° of hip and knee flexion, as proposed in an earlier study [28].…”

Section: Introductionmentioning

confidence: 99%

Precise Instruction and Consideration of the VerticalandHorizontal Force Component Increase Validity and Reliability of the 90:20 Isometric Posterior Chain Test

Rasp,

Paternoster,

Kern

et al. 2024

Preprint

0

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Hamstring injuries are associated with decreased hamstring strength. Matinlauri et al.’s 90:20 Isometric Posterior Chain Test (90:20 IPCT) efficiently assesses hamstring strength, but has not been validated so far. Furthermore, their rather unprecise original instruction allows high variability in test execution. We added a new instruction and parameters and examined, whether this measure leads to increased reliability and validity.We assessed hamstring strength of 23 sport students via the 90:20 IPCT under the original instruction, to exert vertical force, and our new instruction, to exert verticalandhorizontal force. Instead of only using bare vertical force as outcome parameter under the original (Fz_V) and our new instruction (Fz_VH), we also calculated the resultant force (Fres_VH) and the applied torque onto the force place (M_F_ortho_VH). To test for validity, we correlated the outcome parameters with peak torque of gold standard dynamometry. Furthermore, we measured muscle activities of the mm. rectus femoris, biceps femoris, semitendinosus, and gluteus maximus under our new instruction and compared them to those under the original parameter (Fz_V) via one sample t-tests. To evaluate reliability, tests were repeated on two separate days, for which we calculated intra class correlation coefficients (ICCs) and coefficients of variation (CVs).Our new instruction and parameters (Fz_VH, Fres_VH, M_F_ortho_VH) showed better validity (mean r = 0.77, r = 0.81, and r = 0.85) and equally good or better reliability (ICCs: 0.87, 0.89, and 0.94; CVs: 4.7 %, 4.1 %, and 4.7 %) than the original instruction and parameter (Fz_V) (mean r = 0.70; ICC: 0.91; CV: 5.6 %). There were no differences in muscle activities between the parameters and instructions of the 90:20 IPCT.We recommend our new instruction and the applied torque onto the force plate as it makes the 90:20 IPCT a more reliable and valid tool to assess hamstring strength.

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Acute Effects of a Fatiguing Protocol on Peak Force and Rate of Force Development of the Hamstring Muscles in Soccer Players

Cited by 10 publications

References 50 publications

Photovoice as an unfamiliar act of citizenship: everyday belonging, place-making and political subjectivity

Photovoice as an unfamiliar act of citizenship: everyday belonging, place-making and political subjectivity

Sociocultural Conflicts and Ottoman Settlement Policies at the Balkan Wars

Precise Instruction and Consideration of the VerticalandHorizontal Force Component Increase Validity and Reliability of the 90:20 Isometric Posterior Chain Test

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