Roghayeh Afzali Nasab Gorohi, Dr , Dr Mansour Sahebozamani,
Volume 0, Issue 0 (11-2019)
Abstract
Purpose: Neuromuscular and biomechanical factors in ACL injuries are among modifiable risk factors. The purpose of the present study was to evaluate the effect of feedback and feed forward neuromuscular training on balance and isometric strength in female basketball players with a high risk of injury in Kerman.
Method: The present research is semi-experimental, prospective study and the subjects selected objectively based on inclusion and exclusion criteria. Twenty women basketball players of Kerman city purposely selected and who were randomly divided into two groups of feed forward (age=15.73 ±0.78, weigh =61.38±9.09, height = 164.40 ±6.68) and feedback (age=14.70±1.33, weigh =56.31±8.38, height = 161.66±6.02) The training program designed based on the previous studies and conducted during 8 weeks, three sessions per week (each session 15 to 20 minutes) under the supervision of the examiner. Dynamic balance and isometric knee strength was measured using Biodex system and MMT device. One way ANCOVA was used for data analyze.
Result: The results showed significant differences between pre-post test balance Overall Stability index, internal/external index and Anterior/Posterior index (P=0.001).Significant difference was observed in the strength of quadriceps muscle and hamstring muscle between the two groups of feedback and feed forward exercises (P≥0.05). Also, the results of the paired sample t-test showed that Overall Stability in the feedback and feedforward group (0.345% and 0.19%), Balance Anterior/Posterior in the feedback and feedforward group(0.409% and 0.22%) and Balance Medial/Lateral in the feedback and feedforward group(0.427% and 0.22%) has significantly improvement compared to the pre-test (p<0.002).Isometric Quadriceps strength in the post- test showed an significantly improvement of 2.16% in feedback group and 1.82% in feedforward group compared to the pre-test (P=0.001). Isometric hamstring strength in the post- test showed a significantly improvement of 2.07% in feedback group and 1.95% in feedforward group compared to the pre-test (P=0.001).
Conclusion: It can be concluded that neuromuscular training can enhanced balance and isometric strength, of women and training with feedback has more important than training with feedforward.
Keywords: neuromuscular exercises, Injury prevention, Anterior cruciate ligament, Feedback
Dr , Dr ,
Volume 0, Issue 0 (11-2019)
Abstract
Abstract
Introduction and purpose: Jumping motor tasks in people with motor control defects are probably associated with incomplete movement patterns, which can be related to non-collision injuries of the lower limbs. In relation to these people, it has been recommended that the design of exercise protocols should also be done with the aim of controlling and improving functional defects. Therefore, the aim of the present study is to investigate the eight-week training program of feedback on the biomechanical variables of athletes with selected motor control defects in landing jump tasks.
Materials and methods: The present study is a randomized clinical trial study before and after the intervention. 34 male recreational athletes with movement control defects (dynamic knee valgus and quadriceps dominance) were selected based on the study criteria and then randomly assigned to control groups with a ratio of 1:1 (age range, 28.10±4.70years; height, 171±5.49cm; mass, 76.83±5.81kg; and BMI, 22.12± 1.54kg/m² ) and feedback group (age range, 29.80±3.61years; height, 173.80 ± 4.70cm; mass, 78.33±4.64kg; and BMI, 21.40±1.77 kg/m² ).Electromyography data (vastus medialis, vastus lateralis, gluteus medius, Tensor fasciae latae and biceps femoris) and lower limb kinematics (knee valgus angle) were recorded while the participants performed the landing jump movement tasks (vertical jump, tuck and countermovement) in the two previous stages. From the protocol and after the protocol, they performed jumping exercises for two months. In addition, external feedback (first by using educational videos and then verbally while doing the task (place the knee in line with the toes, press the knee towards the wall (external source)) during the two months of the training program and during Performance of movement tasks was presented to the feedback group. To analyze the data, two-way analysis of variance and Bonferroni statistical tests were used for each movement task at a significance level of P < 0.05.
Findings: The results of the study indicated an increase in the electrical activity of the VM and GM muscles and a decrease in the electrical activity of theVL, BF and TF muscles in different phases of jumping in the feedback group. As an example, the results of the Bonferroni post hoc test showed a significant improvement in the feedback group in the amount of electrical activity of the VM muscle (effect size = 0.57, p = 0.001) and GM(effect size = 0.53, p = 0.002). In the eccentric phase, there was a significant improvement in the amount of electrical activity of the VM muscle (effect size = 1.05, p = 0.001) and GM(effect size = 0.77, p = 0.001) in the maximum knee flexion phase and improvement The electrical activity of VM muscle (effect size = 1.71, p = 0.001) and GM (effect size = 1.19, p = 0.001) had significance in the landing moment phase during vine jump. Also, the feedback group showed a decrease in knee valgus angle in the frontal plane (P < 0.05).
Conclusion: The results of the present study showed that feedback has an effect on kinematic and electromyographic parameters and improves the jump-landing biomechanics of the lower limbs in people with knee motor control defects and can be used to correct incomplete movement patterns in jump-landing tasks. be used However, for a general conclusion, more studies are needed in different groups and different sports levels, as well as more samples.
Mohadse Salehi Sarbizhan, Amir Letafatkar, Mehdi Khaleghi,
Volume 16, Issue 16 (12-2018)
Abstract
The most common side effect of physical activity is the risk of musculoskeletal damage, that anterior cruciate ligament injury is the most common one. Purpose of the study is comparing the effect of six weeks of comprehensive injury prevention training on anterior cruciate ligament with internal and external feedback on the proprioception and knee function of active female university students. Forty five active female university students aged 18-25 years were volunteered and randomly assigned to three groups (internal, external and control) and they performed the protocol three times a week for six weeks. Proprioception and function of the knee joint were measured using goniometer and functional tests in two stages namely pre-test and post-test. Statistical analysis of covariance, paired t test and Tukey's post hoc tests were used for statistical analysis with a significant level of p≤0.05. Overall results of the study showed that the present exercise protocol with internal and external feedback had a significant effect on the proprioception of p≤0.001 and p=0.000 for the knee performance and there was no significant difference between the two training groups. Regarding the results of the study, it is suggested that the present training protocol be addressed by coaches and sport sciences specialists as a complementary tool and method, along with other training methods, for those who are prone to damage to the anterior cruciate ligament.
Soroush Shah Hosseini, Amir Hossein Barati, Mohammad Hossein Nasermeli, Mohsen Moradi,
Volume 18, Issue 20 (11-2020)
Abstract
Given that more than 50 percent of patellofemoral pain syndrome include of overuse injuries, the aim of this study was to compare the vastus medialis muscle activity in individuals with patellofemoral pain syndrome after a period of strength and flexibility training with and without the electrophysiological feedback. A total of 30 subjects (15 men and 15 women) participated in this study. Subjects were divided into three group's control, therapeutic and therapeutic with electrophysiological feedback. One-way ANOVA was used to compare the activity of vastus medialis muscle in between groups. The results of this study showed that there was a significant difference between the groups in the activity of the vastus medialis muscle activity (P <0.05). The results of Tukey's post hoc test for intra-group comparisons showed that there was a significant difference between the control group with the therapeutic group (P = 0.024), the control group with the therapeutic group and the electrophysiological feedback (P=0.028) and the therapeutic group with the therapeutic group and the electrophysiological feedback (P<0.001). Conclusion: Regarding the results of this study, therapeutic exercises with electrophysiological feedback have a greater effect on the activity of vastus medialis than the therapeutic group in patients with patellofemoral pain syndrome.
