Shiraz University of Medical SciencesJournal of Rehabilitation Sciences & Research2345-61671120140111A Biomechanical Analysis of the Contributing Factors to Increases in Vertical Jump Height Following Exercise with Weighted Vests274104410.30476/jrsr.2014.41044ENBehdadTahayoriDepartment of Kinesiology, Louisiana State University, Baton Rouge, LA 70803, USA
Department of Kinesiology, Indiana University, Bloomington IN 47405, USA0000-0001-7937-5208Arnold G.NelsonDepartment of Kinesiology, Louisiana State University, Baton Rouge, LA 70803, USADavid M.KocejaDepartment of Kinesiology, Louisiana State University, Baton Rouge, LA 70803, USA
Department of Kinesiology, Indiana University, Bloomington IN 47405, USAJournal Article20131125Background and objectives: It has been shown that a bout of jumping exercise with weighted vests increases the subsequent countermovement jump height. However, it is not clear whether the improvement in jump height is due to the enhancement of joint power or due to other mechanisms such as neural adaptations.Methods: To investigate this dichotomy, we tested the acute neuromechanical changes following a preloaded exercise protocol (3 sets of 5 consecutive CMJs with a weighed vest equal to 15% of the body mass of the participant) that successfully increased the subsequent jump height. On average, jump height increased 1.52 cm (5.4%) after this exercise as compared to CMJs prior to the exercise protocol.Results: A significant decrease in the time from the start of the movement to take off (pre-take off duration) was observed. This decrease was exclusively caused by exercising with a weighted vest, since such a change was not observed in the control sessions in which participants exercised without the weighted vest. Our data showed that jumpers leave the ground with some degrees of knee flexion and upon exercising with weighted vest this amount of flexion increased and hence an increase in the jump height. However, no significant changes in peak values of lower limb joint angle, velocity, moment and power were observed.Conclusion: It is suggested that for designing weighted vest exercise protocols with the aim of increasing jump height, the idea of modifying the timing of the movement should be considered as a cause of the enhancement. This novel idea adds another mechanism for increasing the jump height following weighted vest exercise, along with the general belief of muscle potentiation..https://jrsr.sums.ac.ir/article_41044_6ecfebbeb2dd7713d37675e4969ae812.pdfShiraz University of Medical SciencesJournal of Rehabilitation Sciences & Research2345-61671120140111Relationship Between Quality of Life and Hypertonia in Young Adults with Spastic Cerebral Palsy8114104510.30476/jrsr.2014.41045ENNasrinSalehi DehnoShohrehNoorizadeh DehkordiMehdiDadgooMasoudSalehiJournal Article20131118Background and objectives: The complications associated with spastic cerebral palsy can affect the physical ability and quality of life of individuals suffering from this motor disorder. The aim of this study was to assess the relationship between quality of life and hypertonia in adults with spastic cerebral palsy.Methods: In an analytical cross sectional study, 70 subjects with the diagnosis of spastic cerebral palsy from three Ra'ad Rehabilitation Goodwill complexes in Tehran and Karaj cities took part in this study through convenient sampling. The severity of spasticity and contracture of the knee flexors were measured by Modified Tardieu Scale. Also the quality of life was assessed through World Health Organization quality of life-BREF questionnaire. To analyze data, Pearson and spearman correlation coefficient were used.Results: Participants of this study were 42.9% male, 57.1% female with mean age 26.24± 5 years. No correlation existed between quality of life with knee flexor muscles spasticity. However, psychological and environmental domains showed low correlations with knee extension range (respectively r=0.26 and r=0.28; p< 0.05)Conclusion: The influences of the mechanical component of hypertonia (contracture) on the quality of life are more prominent than neural factors such as spasticity.https://jrsr.sums.ac.ir/article_41045_79f168bddb5520566d5a4a9bdbfc118a.pdfShiraz University of Medical SciencesJournal of Rehabilitation Sciences & Research2345-61671120140111The Effect of the Loading on Dynamic Stability and Scapular Asymmetry12164104610.30476/jrsr.2014.41046ENMohammad HassanAzarsaTehran University of Medical Sciences, Teharan, IranAzadehShadmehrTehran University of Medical Sciences, Teharan, IranShohrehJalaeiTehran University of Medical Sciences, Teharan, IranJournal Article20130820Background and objectives: Scapular stabilization and neuromuscular control provide an important parameter to characterize shoulder function during dynamic activities. Many studies have confirmed the effect of the loading on scapular position and scapulohumeral rhythm. Therefore, the evaluation of stabilizer muscles involvement in scapular asymmetry may assist in the development of clinical examination and rehabilitation program. The aim of this study was to evaluate the effect of loading on dynamic stability and scapular asymmetry in basketball players.Methods: Thirty healthy male basketball players aged between 20 to 31 years old were tested. The linear distance between scapular inferior angle and T7 spinous process was measured using a caliper in 90 degrees of unloaded scaption and with 1, 2 and 4 kg loading. The difference of distances of two sides in the above 4 positions was analyzed.Results: The amount of distances difference in two sides with 1 kg loading was minimal (9.36mm). This difference increased to 10.19 mm and 12.22 mm, with increasing the loading to 2 and 4 kg respectively; although the 4 positions of the test did not show significant differences in distances difference (p>0.05).Conclusion: This study shows that dynamic stability of the scapula is dependent on the role of muscles, so that with increasing load on the muscles, the scapular asymmetry is more pronounced.https://jrsr.sums.ac.ir/article_41046_99601877a1b06f8bdafc9a2b52324991.pdfShiraz University of Medical SciencesJournal of Rehabilitation Sciences & Research2345-61671120140112Biomechanical Evaluation of Spontaneous Repair of Osteochondral Defects in the Rabbit Knee17204104710.30476/jrsr.2014.41047ENFahimehKamaliDepartment of Physiotherapy, Shiraz University of Medical Sciences, Shiraz, IranGitiTorkamanDepartment of Physiotherapy, Tarbiat Modares University, Tehran, Iran0000-0002-7625-8759Journal Article20130820Background and objectives: Examination of cartilage repair in animal work is dependent upon the thickness and radius of the induced impalement. Full-thickness defects with a radius of 3 mm have been commonly used in animal studies to evaluate new procedures designed to improve the quality of articular cartilage repair. The aim of the present study was to define the biomechanical characteristics of the repair of 5×4 mm full-thickness osteochondral defects in adult male rabbits.Methods: In a controlled clinical trial study 5 mm diameter and 4 mm deep osteochondral defects were drilled in the femoral patellar groove of twenty-one rabbits, and examined at 4, 8, and 16 weeks. The left knee was kept intact and was regarded as control. The knee joints were removed, and both legs were examined biomechanically by in situ indentation method at three time intervals (4, 8, 16 weeks). The instantaneous and equilibrium elastic- modulus (after 900 second) were measured during the test.Results: There were no differences in cartilage mechanical properties (instantaneous and equilibrium elastic-modulus) in different weeks (4, 8, 16 weeks) in the two groups (p=0/08). However, significant differences were seen between the experimental and control groups in 16 weeks in instantaneous elastic_ modulus (p= 0.44). It suggests that new tissue in this group had more stiffness than control in 16 weeks.Conclusion: Full-thickness osteochondral defect, measuring 5×4 mm in the patellar groove of the adolescent rabbit knee healed spontaneously.https://jrsr.sums.ac.ir/article_41047_f87434068715ad249ab816a80c76cfab.pdfShiraz University of Medical SciencesJournal of Rehabilitation Sciences & Research2345-61671120140111The Comparison of Neurodevelopmental- Bobath Approach with Occupational Therapy Home Program on Gross Motor Function of Children with Cerebral Palsy21244104810.30476/jrsr.2014.41048ENFaranakBehzadiHesammedinNorooziMarziehMohamadi0000-0001-6069-7055Journal Article20130819Background & objectives: Traditional Bobath approach (TBA) is one of the several methods using in treatment of children with cerebral palsy (CP) who referred to occupational therapy setting. In this study, the effect of TBA compared with home program Bobath approach (HPBA), on the gross motor function (GMF) of children with CP.Methods: in this clinical trial, 30 children with CP studied in two groups of 15, randomly. Control group received Bobath traditional services 12 sessions. In the intervention group, along with these services, parents participated in training program and fallowed the exercises. Peabody scale assessed GMF before and after intervention.Results: GMF increased significantly in both groups. In addition, differences between the two groups were significant (p=.007).Conclusions: the results of this study showed that TBA with HPBA was more effective than the traditional ones.https://jrsr.sums.ac.ir/article_41048_a05db193b407d052e406c93b18a5cd1d.pdf