Influence of Reactive and Maximum Strength Indicators on Sprint Performance

Healy, Robin; Smyth, Carol; Kenny, Ian C.; Harrison, Andrew J.

doi:10.1519/jsc.0000000000002635

Cited by 21 publications

(32 citation statements)

References 28 publications

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“…The results regarding the sprinting test showed that there is no change in performance across the training period or among groups in general. Sprinting speed is of great importance for achieving success in sports [55]. For example, the presence of short-haul running races (i.e., up to 800 m) which are constantly held in HIFT competitions are associated with success in the sport [5].…”

Section: Discussionmentioning

confidence: 99%

Effects of Six Weeks of High-Intensity Functional Training on Physical Performance in Participants with Different Training Volumes and Frequencies

Teixeira

Batista

Mortatti

et al. 2020

IJERPH

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High-intensity functional training (HIFT) is characterized by presenting high volumes and training intensities with constantly varied exercises. The aim of this study was to analyze the internal training load and the effects of high-intensity functional training on physical performance in subjects with different training volumes and frequencies. A total of 31 volunteers involved in high-intensity functional training (14 men and 17 women) were divided according to their training volumes and frequencies (high training-volume and frequency—HTVF; (n = 17) (nine women and eight men; age: 31.0 ± 6.3 years; height: 168.8 ± 8.1 cm, body weight: 73.6 ± 11.9 kg; BMI: 25.96 kg/m2) and moderate training volume and frequency—MTVF; (n = 14) (eight women and six men; age: 26.6 ± 4.7 years; height: 167.2 ± 8.6 cm, body weight: 75.8 ± 18.0 kg; BMI: 27.33 kg/m2)). The internal training load was determined using the session-rating of perceived exertion method. The monotony index (MI) and training strain (TS) were used to determine training variability during the training weeks. Countermovement vertical jump height, 20-m sprinting and handgrip strength were assessed at baseline and after six weeks of training. There was a time effect for MI ((F(5, 145) = 5.942; p = 0.0001)), TS ((F(5, 145) = 5.734; p = 0.0001)), weekly internal training load ((F(4.006, 116.87) = 4.188; p = 0.003)) and mean weekly internal training load ((F(4.006, 116.87) = 4.188; p = 0.003)). There was no increase in performance in either group for countermovement vertical jump height ((F(1,29) = 6.081; p = 0.050)), sprinting ((F(1,29) = 1.014; p = 0.322)), right handgrip strength ((F(1,29) = 2.522; p = 0.123)) or left handgrip strength ((F(1,29) = 2.550; p = 0.121)). The current findings suggest that six weeks of high-intensity functional training was not able to increase performance in either group. Therefore, different volumes and frequencies do not seem to influence the increase in physical performance of HIFT practitioners.

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Section: Discussionmentioning

confidence: 99%

Effects of Six Weeks of High-Intensity Functional Training on Physical Performance in Participants with Different Training Volumes and Frequencies

Teixeira

Batista

Mortatti

et al. 2020

IJERPH

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“…Reactive strength index was calculated for the DLDJ and SLDJ as jump height divided by ground contact time. 13 Time to complete the 90° CoD was recorded using speed gates (Smartspeed; Fusion Sport) with a trigger gate 2 m from the start line and an exit gate 2 m to the left and right of the force plates to indicate the end of the maneuver. 21…”

Section: Methodsmentioning

confidence: 99%

Can Biomechanical Testing After Anterior Cruciate Ligament Reconstruction Identify Athletes at Risk for Subsequent ACL Injury to the Contralateral Uninjured Limb?

et al. 2021

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Background: Athletes are twice as likely to rupture the anterior cruciate ligament (ACL) on their healthy contralateral knee than the reconstructed graft after ACL reconstruction (ACLR). Although physical testing is commonly used after ACLR to assess injury risk to the operated knee, strength, jump, and change-of-direction performance and biomechanical measures have not been examined in those who go on to experience a contralateral ACL injury, to identify factors that may be associated with injury risk. Purpose: To prospectively examine differences in biomechanical and clinical performance measures in male athletes 9 months after ACLR between those who ruptured their previously uninjured contralateral ACL and those who did not at 2-year follow-up and to examine the ability of these differences to predict contralateral ACL injury. Study Design: Case-control study; Level of evidence, 3. Methods: A cohort of male athletes returning to level 1 sports after ACLR (N = 1045) underwent isokinetic strength testing and 3-dimensional biomechanical analysis of jump and change-of-direction tests 9 months after surgery. Participants were followed up at 2 years regarding return to play or at second ACL injury. Between-group differences were analyzed in patient-reported outcomes, performance measures, and 3-dimensional biomechanics for the contralateral limb and asymmetry. Logistic regression was applied to determine the ability of identified differences to predict contralateral ACL injury. Results: Of the cohort, 993 had follow-up at 2 years (95%), with 67 experiencing a contralateral ACL injury and 38 an ipsilateral injury. Male athletes who had a contralateral ACL injury had lower quadriceps strength and biomechanical differences on the contralateral limb during double- and single-leg drop jump tests as compared with those who did not experience an injury. Differences were related primarily to deficits in sagittal plane mechanics and plyometric ability on the contralateral side. These variables could explain group membership with fair to good ability (area under the curve, 0.74-0.80). Patient-reported outcomes, limb symmetry of clinical performance measures, and biomechanical measures in change-of-direction tasks did not differentiate those at risk for contralateral injury. Conclusion: This study highlights the importance of sagittal plane control during drop jump tasks and the limited utility of limb symmetry in performance and biomechanical measures when assessing future contralateral ACL injury risk in male athletes. Targeting the identified differences in quadriceps strength and plyometric ability during late-stage rehabilitation and testing may reduce ACL injury risk in healthy limbs in male athletes playing level 1 sports. Clinical Relevance: This study highlights the importance of assessing the contralateral limb after ACLR and identifies biomechanical differences, particularly in the sagittal plane in drop jump tasks, that may be associated with injury to this limb. These factors could be targeted during assessment and rehabilitation with additional quadriceps strengthening and plyometric exercises after ACLR to potentially reduce the high risk of injury to the previously healthy knee. Registration: NCT02771548 ( ClinicalTrials.gov identifier).

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“…In a study conducted by Dymond et al in 2011 with 20 rugby players aged 19±2 years, it was stated that there was a high level of positive correlation between RSI and relative strength, and changes in MS could explain approximately 40% of reactive strength. In the study conducted by Healy et al in 2018 with 14 male sprinters with Xage = 22 ± 2 years and 14 female sprinters with Xage = 22 ± 4 years, it was stated that there was no significant relationship between isometric peak power and RSI determined by vertical jump applied from a height of 30 cm 51 . When we compare it with the studies in the literature, it is thought that the reason for the differences in the level of relationship in our research group is due to the isometric measurement tool taken.…”

Section: Discussionmentioning

confidence: 97%

Investigation and Interpretation of Maximal and Reactive Strength Index Characteristics of 16-17 Age Group Basketball Players

Kara¹,

Özal²,

Özal³

2021

PJMHS

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Aim: The aim of the study was determined as the examination of the reactive strength index parameter, which shows the maximal strength and explosive force characteristics of 16-17 age group basketball players determined by isometric test. Method: The basketball branch Xage = 16.50 ± 0.51 years, XHeight = 177.22 ± 8,56 cm, XBW= 73.14 ± 12,43 kg, XBMI= 23.26 ± 3,46 kg / m2, and XBFP = 14.72 ± 5.67% of which 32 are men. In the study, the measurements of the height of the participants were made with Holtain brand stadiometer, body weight and fat percentage ratio measurement with Tanita BC 418 MA, reactive strength index measurement with Opto Jump Next, and maximal strength measurement with Baseline brand leg dynamometers. Pearson test was used to determine the relationship between branch-specific MS and RSI. Results: According to the correlation results, no significant relationship was found between MS and RSI (p>0.05). Conclusions: As a result, it has been determined that basketball players between the ages of 16-17 do less quality work on developing MS and explosive force. Keywords: Basketball, Maximal Strength, Reactive Strength İndex.

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Influence of Reactive and Maximum Strength Indicators on Sprint Performance

Cited by 21 publications

References 28 publications

Effects of Six Weeks of High-Intensity Functional Training on Physical Performance in Participants with Different Training Volumes and Frequencies

Effects of Six Weeks of High-Intensity Functional Training on Physical Performance in Participants with Different Training Volumes and Frequencies

Can Biomechanical Testing After Anterior Cruciate Ligament Reconstruction Identify Athletes at Risk for Subsequent ACL Injury to the Contralateral Uninjured Limb?

Investigation and Interpretation of Maximal and Reactive Strength Index Characteristics of 16-17 Age Group Basketball Players

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