eng
Shiraz University of Medical Sciences
Journal of Rehabilitation Sciences & Research
2345-6167
2345-6159
2014-01-11
1
1
2
7
10.30476/jrsr.2014.41044
41044
Original Articles
A Biomechanical Analysis of the Contributing Factors to Increases in Vertical Jump Height Following Exercise with Weighted Vests
Behdad Tahayori
btahayori@usa.edu
1
Arnold Nelson
anelso@lsu.edu
2
David Koceja
koceja@indiana.edu
3
Department of Kinesiology, Louisiana State University, Baton Rouge, LA 70803, USA
Department of Kinesiology, Indiana University, Bloomington IN 47405, USA
Department of Kinesiology, Louisiana State University, Baton Rouge, LA 70803, USA
Department of Kinesiology, Louisiana State University, Baton Rouge, LA 70803, USA
Department of Kinesiology, Indiana University, Bloomington IN 47405, USA
Background 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.pdf
jump height
Exercise
biomechanics
eng
Shiraz University of Medical Sciences
Journal of Rehabilitation Sciences & Research
2345-6167
2345-6159
2014-01-11
1
1
8
11
10.30476/jrsr.2014.41045
41045
Original Articles
Relationship Between Quality of Life and Hypertonia in Young Adults with Spastic Cerebral Palsy
Nasrin Salehi Dehno
1
Shohreh Noorizadeh Dehkordi
noorizadeh@razi.tums.ac.ir
2
Mehdi Dadgoo
mehdidadgoo@yahoo.com
3
Masoud Salehi
salehi74@yahoo.com
4
Background 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.pdf
adult
cerebral palsy
Quality of life
hypertonia
eng
Shiraz University of Medical Sciences
Journal of Rehabilitation Sciences & Research
2345-6167
2345-6159
2014-01-11
1
1
12
16
10.30476/jrsr.2014.41046
41046
Original Articles
The Effect of the Loading on Dynamic Stability and Scapular Asymmetry
Mohammad hassan Azarsa
mh-azarsa@razi.tums.ac.ir
1
Azadeh Shadmehr
shadmehr@tums.ac.ir
2
Shohreh Jalaei
jalaeish@tums.ac.ir
3
Tehran University of Medical Sciences, Teharan, Iran
Tehran University of Medical Sciences, Teharan, Iran
Tehran University of Medical Sciences, Teharan, Iran
Background 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.pdf
loading
scapular asymmetry
stabilizer muscles
dynamic stability
eng
Shiraz University of Medical Sciences
Journal of Rehabilitation Sciences & Research
2345-6167
2345-6159
2014-01-12
1
1
17
20
10.30476/jrsr.2014.41047
41047
Original Articles
Biomechanical Evaluation of Spontaneous Repair of Osteochondral Defects in the Rabbit Knee
Fahimeh Kamali
fahimekamalii@gmail.com
1
Giti Torkaman
torkamg@modares.ac.ir
2
Department of Physiotherapy, Shiraz University of Medical Sciences, Shiraz, Iran
Department of Physiotherapy, Tarbiat Modares University, Tehran, Iran
Background 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.pdf
Articular Cartilage
Biomechanical Evaluation
Clinical trial
Elastic Modulus
Repair
Indentation
Instantaneous and Equilibrium
Osteochondral Defect
Patellar Groove
Stiffness
eng
Shiraz University of Medical Sciences
Journal of Rehabilitation Sciences & Research
2345-6167
2345-6159
2014-01-11
1
1
21
24
10.30476/jrsr.2014.41048
41048
Original Articles
The Comparison of Neurodevelopmental- Bobath Approach with Occupational Therapy Home Program on Gross Motor Function of Children with Cerebral Palsy
Faranak Behzadi
f_behzadi84@yahoo.com
1
Hesammedin Noroozi
hesam_noroozi@yahoo.com
2
Marzieh Mohamadi
mohamadm@sums.ac.ir
3
Background & 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
occupational therapy
home programs
cerebral palsy