scholarly journals CHANGE IN KNEE SEPARATION DISTANCE IN ADOLESCENT ATHLETES AFTER A 6-WEEK NEUROMUSCULAR TRAINING PROGRAM

2021 ◽  
Vol 9 (7_suppl3) ◽  
pp. 2325967121S0003
Author(s):  
Jorge E. Gómez ◽  
P. Burke Wilson ◽  
Timothy Johnson
Keyword(s):  
Training Program ◽  
Separation Distance ◽  
Ligament Injury ◽  
Neuromuscular Training ◽  
Adolescent Athletes ◽  
Knee Ligament ◽  
Jump Landing ◽  
Counter Movement Jump ◽  
Landing Mechanics ◽  
Balance Exercises

Background: Existing neuromuscular injury prevention programs have relied principally on lower extremity strengthening, agility, cutting and landing technique to improve jump landing mechanics in order to prevent non-contact knee ligament injuries. Purpose: To determine whether a 6-week neuromuscular training program emphasizing core (back & hip) strengthening and dynamic balance exercises can significantly improve normalized knee separation distance (nKSD) during a standard counter-movement jump landing maneuver. Methods: Fourteen adolescent athletes (11 boys, 3 girls, ages 12-15) volunteered to undergo a 2 day/week, 6-week off-season training program. On the first day of training, the athletes underwent assessments that included 2 trials of a counter-movement jump from a 40cm platform. The tests were recorded using a video camera in the frontal plane. Using Dartfish motion analysis software, knee separation distance (KSD) was measured as the distance (cm) between the femoral condyles at the lowest point of the jump landing, and intertrochanteric distance (ITD) as the distance (cm) between the femoral trochanters. Normalized knee separation distance was computed as nKSD = KSD/ITD. The training program focused on three progressions; increasing difficulty of core strengthening exercises, balance exercises, and agility drills. One-hour training sessions were subdivided as follows; 5 min dynamic warm-up, 10 min stretching, 10 min body weight core exercises, 15 min balancing exercises, 10 min dumbbell core exercises, 15 minute agility drills, 5 min of rest/hydration breaks. The athletes repeated the counter-movement jump test at the end of the 6 weeks. Results: There was a significant improvement (t = 2.740, p = 0.017) in nKSD between post-test (0.789 + 0.372) and pre-test (0.683 + 0.323) Conclusion: A 6-week neuromuscular training program focused on core strengthening and balance significantly improved jump landing mechanics which may reduce the risk of knee ligament injury.

The Drop-Jump Screening Test

2005 ◽  
Vol 33 (2) ◽  
pp. 197-207 ◽  
Author(s):  
Frank R. Noyes ◽  
Sue D. Barber-Westin ◽  
Cassie Fleckenstein ◽  
Cathy Walsh ◽  
John West
Keyword(s):  
Training Program ◽  
Lower Limb ◽  
Female Athletes ◽  
Cruciate Ligament ◽  
Separation Distance ◽  
Neuromuscular Training ◽  
Drop Jump ◽  
Limb Alignment ◽  
Lower Limb Alignment ◽  
Male Athletes

Background A valgus lower limb alignment has been noted during noncontact anterior cruciate ligament injuries. A video dropjump test can indicate an athlete's ability to control lower limb axial alignment in the coronal plane. Hypotheses Female athletes have decreased knee separation distances on landing and acceleration; male athletes have a neutrally aligned lower limb position. A neuromuscular training program will significantly increase knee separation distance in female athletes. Study Design Cohort study; Level of evidence, 2. Methods The authors tested 325 female and 130 male athletes aged 11 to 19 years. The distance between the hips, knees, and ankles was measured during a drop-jump test. The separation distance between the knees and ankles was normalized by the hip separation distance. A neuromuscular training program (Sportsmetrics) was completed by 62 female athletes, and their jump-landing characteristics were reexamined. Results A marked decrease in knee separation distance was found on takeoff in 80% of female athletes and in 72% of male athletes. There was no difference between male and female athletes in the normalized knee and ankle separation distance during the landing and takeoff phases. The knee separation distance on landing was 23 ± 9 cm in the female athletes and 22 ± 8 cm in the male athletes. The normalized knee separation distance was 51% ± 19% in the female athletes and 51% ± 15% in the male athletes. After training, statistically significant increases were found in the female athletes in the knee separation distance on landing (29 ± 8 cm, P<. 0001) and in the normalized knee separation distance (68% ± 18%, P<. 0001). The trained female athletes had significantly greater knee separation distance and normalized knee separation distance than did the males (P<. 0001). Conclusions The majority of untrained female and male athletes demonstrated a valgus alignment appearance on the video test. After neuromuscular training, female athletes had improved knee separation distances and a more neutral lower limb alignment on landing and takeoff.

How a Movement Training Program Affects Jump Landing Mechanics and ACL Injury Risk

2008 ◽  
Vol 40 (Supplement) ◽  
pp. S157
Author(s):  
Michael J. Duffey ◽  
Michele L. Duffey ◽  
Donna Vargas ◽  
Kenneth Cameron ◽  
Sally Mountcastle ◽  
...  
Keyword(s):  
Training Program ◽  
Injury Risk ◽  
Acl Injury ◽  
Jump Landing ◽  
Movement Training ◽  
Landing Mechanics ◽  
Acl Injury Risk

Estimation of Knee Ligament Injury Measures for a Pedestrian Dummy

2009 ◽  
Vol 2 (1) ◽  
pp. 1116-1124 ◽  
Author(s):  
Yukou Takahashi ◽  
Masayoshi Okamoto ◽  
Akihiko Akiyama ◽  
Yuji Kikuchi
Keyword(s):  
Ligament Injury ◽  
Knee Ligament ◽  
Knee Ligament Injury

scholarly journals Efecto del entrenamiento de fuerza en deportistas femeninas de deportes colectivos mediante tecnología isoinercial

2021 ◽  
Vol 10 (1) ◽  
pp. 79-86
Author(s):  
S. Pérez Muñoz ◽  
D. Morilla de la Riva ◽  
G. Alonso García ◽  
A. Sánchez Muñoz ◽  
FJ. Albert García ◽  
...  
Keyword(s):  
Training Program ◽  
Performance Improvement ◽  
Team Sports ◽  
Leg Strength ◽  
Explosive Strength ◽  
Repeated Sprint Ability ◽  
Repeated Sprint ◽  
Counter Movement Jump ◽  
Explosive Force ◽  
Sprint Ability

El objetivo de esta investigación es analizar el efecto de un programa de fuerza mediante tecnología isoinercial durante cuatro semanas, en la mejora del rendimiento en mujeres de deportes colectivos con carácter intermitente. La muestra estaba compuesta por seis mujeres con una edad media de 21±1.79 años. Se realizaron los test de cambios de dirección V-cut, fuerza explosiva counter movement jump y repeated sprint ability sobre 40 m. Los principales resultados muestran que se mejoraron todas las variables analizadas mediante el entrenamiento con tecnología isoinercial. Además, presentaron diferencias significativas (p<.05) en las variables de fuerza explosiva y de repeated sprint ability. Por lo tanto, un programa de entrenamiento de fuerza a través de tecnología isoinercial durante cuatro semanas de entrenamiento es suficiente para la mejora de los cambios de dirección, la resistencia a la repetición de esprines y la fuerza explosiva de piernas. The aim of this research is to analyse the effect of a four-week strength programme using isoinertial technology on performance improvement in women in team sports on an intermittent basis. The sample was composed of six women with an average age of 21 (±1.79 years). The tests of V-cut direction changes, explosive force counter movement jump and repeated sprint ability over 40 m were performed. The main results show that all the variables analysed are improved by training with isoinertial technology. They present significant differences (p<.05) in the variables of explosive strength and repeated sprint ability. Therefore, a strength training program using isoinertial technology during four weeks of training is sufficient for the improvement of direction changes, resistance to repeated sprinting and explosive leg strength.

scholarly journals Biomechanical Symmetry During Drop Jump Landing And Takeoff In Adolescent Athletes Following Recent ACL Reconstruction

2021 ◽  
Vol 53 (8S) ◽  
pp. 142-143
Author(s):  
Tracy Zaslow ◽  
Eva Ciccodicola ◽  
Nicole Mueske ◽  
Mia Katzel ◽  
Curtis Vandenberg ◽  
...  
Keyword(s):  
Acl Reconstruction ◽  
Drop Jump ◽  
Adolescent Athletes ◽  
Jump Landing
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