Learning Effect on the Dynamical Strategies in Sitting Position on Seesaw Motion for Idiopathic Scoliosis Patients.
Learning effect on the dynamical strategies in sitting position on seesaw motion for idiopathic scoliosis patients.
Filed under: Rehab Centers
Neurosci Lett. 2012 Dec 27;
Bruyneel AV, Mesure S
Our study meant to determine, for idiopathic scoliosis patients, the biomechanical processes involved in postural regulation when self-imposed disturbances occur in seated position in both directions during successive trials. 12 female adolescents with right thoracic scoliosis (SG) and 15 control adolescents (CG) were included in this study. Ground reaction forces were studied using a force platform while the subjects were maintaining their balance in sitting position on a seesaw. Every test is recorded with eyes opened, arms on shoulders and legs free. The force platform data (AP and ML forces data) obtained were processed to determine the following normalised force parameters: delta value (difference between maxima and minima), maximal and minimal force values (peak and occurrence), and the variability of AP and ML forces. We used a variance analysis (ANOVA test) to analyse and compare 3 trials and groups. Our results show that, whatever the directions of destabilization (AP versus ML), SG was always in a learning situation. Indeed, the first test is always less stable than the second and third trials. However, for CG, adaptability between the tests is only highlighted during ML imbalance. Significant differences of strategies between the groups are only visible for the AP force component. For all conditions imposed, scoliotic patients perform specific trunk balance strategies. Clinical tests and rehabilitation methods should include the learning effect within the spatio-temporal adaptation to ground reaction forces.
HubMed – rehab
Muscle Functional MRI to Evaluate Quadriceps Dysfunction in Patellofemoral Pain.
Filed under: Rehab Centers
Med Sci Sports Exerc. 2012 Dec 27;
Pattyn E, Verdonk P, Steyaert A, Van Tiggelen D, Witvrouw E
PURPOSE: A dysfunction of the quadriceps muscle group has often been suggested to play an important role in the pathophysiology of patellofemoral pain (PFP). However, consensus is lacking regarding the quadriceps recruitment pattern of patients with PFP. The aim of this study is to examine by muscle functional magnetic resonance imaging (mfMRI) if PFP patients actually exhibit an altered activation of the muscles that play a significant role in the dynamic balance of the patella. METHODS: Forty-six patients with PFP (25 female and 21 male, mean age 25.0 ± 7.4 years) and 30 healthy control subjects (17 female and 13 male, mean age 21.6 ± 4.5 years) underwent MRI of the quadriceps before and immediately after a squat exercise. The transverse relaxation time (T2) and the T2 shift were calculated for the vasti muscles. RESULTS: There were no significant differences in the T2 values at rest and the T2 shift values between the patient and the control group, except for the T2 rest value of the VMVI of females (P=0.007). The T2 shift of the VL was significantly smaller than the T2 shift of the VMVI in both study groups (male P<0.001 and female P=0.044), while in females, the T2 shift of the VMO was also significantly smaller than the T2 shift of the VMVI (P=0.027). CONCLUSIONS: The activation pattern of the quadriceps is not altered in patients with PFP for both males and females. As the relative contribution of the quadriceps muscles to a functional activity has not been modified, there is no evidence for quadriceps dysfunction. HubMed – rehab
Exercise Responses during FES Cycling in Individuals with Spinal Cord Injury.
Filed under: Rehab Centers
Med Sci Sports Exerc. 2012 Dec 27;
Hasnan N, Ektas N, Tanhoffer AI, Tanhoffer R, Fornusek C, Middleton J, Husain R, Davis GM
PURPOSE: This study compared acute exercise responses during arm cranking, functional electrical stimulation (FES)-assisted leg cycling and combined arm and leg (“hybrid”) cycling in individuals with spinal cord injury (SCI) during maximal and submaximal exercise. METHODS: Nine male subjects with long-standing neurological lesions from C7-T12 were recruited. All subjects performed arm crank ergometry (ACE), FES-leg cycle exercise (FES-LCE), combined ACE+FES-LCE and cycling on a hybrid FES tricycle (HYBRID). They were assessed for their peak exercise responses in all four modalities. Subsequently, their submaximal heart rates (HR), cardiac outputs (Q), stroke volumes (SV) and arteriovenous oxygen extractions (Ca-Cv)O2 were measured at 40%, 60% and 80% of mode-specific VO2peak. RESULTS: Arm exercise alone and arm+leg exercise resulted in significantly higher VO2peak and HRpeak compared to FES-LCE (p<0.05). Submaximal VO2 during FES-LCE was significantly lower than all other modalities, across the range of exercise intensities (p<0.05). ACE elicited 70-94% higher steady-state VO2, and HYBRID evoked 99-148% higher VO2 compared to FES-LCE. Steady-state FES-LCE also produced significantly lower Q, HR, and (Ca-Cv)O2. ACE evoked 31-36% higher Q and 19-47% greater HR than did FES-LCE. HYBRID elicited 31-49% greater Q and 23-56% higher HR than FES-LCE. CONCLUSIONS: Combined arm and leg exercise can develop a higher oxygen uptake and greater cardiovascular demand compared to ACE or FES-LCE alone. These findings suggested that combined arm+leg FES training at submaximal exercise intensities may lead to greater gains of aerobic fitness than would arm exercise alone. These data also proffered that FES leg-cycling exercise by itself may be insufficient to promote aerobic fitness in the SCI population. HubMed – rehab
Massage Timing Affects Postexercise Muscle Recovery and Inflammation in a Rabbit Model.
Filed under: Rehab Centers
Med Sci Sports Exerc. 2012 Dec 27;
Haas C, Butterfield TA, Abshire S, Zhao Y, Zhang X, Jarjoura D, Best TM
PURPOSE: This study compared the effect of immediate versus delayed massage-like compressive loading (MLL) on peak isometric torque recovery and inflammatory cell infiltration following eccentric exercise (EEX). METHODS: Eighteen skeletally mature New Zealand White rabbits were instrumented with peroneal nerve cuffs for stimulation of hindlimb tibialis anterior muscles. Following a bout of EEX, rabbits were randomly assigned to a MLL protocol (0.5Hz, 10N, 15min) started immediately post-EEX, 48 hours post-EXX, or no-MLL control and performed for four consecutive days. A torque-angle (T-?) relationship was obtained for 21 joint angles pre and post-EEX and post four consecutive days of MLL or no-MLL. Muscle wet weights and immunohistochemical sections were obtained following final treatments. RESULTS: EEX produced an average 51% (±13%) decrease in peak isometric torque output. Greatest peak torque recovery occurred with immediate application of MLL. There were differences in torque recovery between immediate and delayed MLL (p=0.0012), immediate MLL and control (p<0.0001), and delayed MLL and control (p=0.025). Immunohistochemical analysis showed 39.3% and 366.0% differences in the number of RPN3/57 and CD11b positive cells between immediate (p=0.71) and delayed MLL (p=0.12). Area under the T-? curve showed a difference for immediate (p<0.0001) and delayed (p=0.0051) MLL as compared to control. Exercise produced an average 10°± 0.2 rightward shift from pre exercise peak isometric torque angle. Control, immediate MLL and delayed MLL produced an average leftward angular shift from the post exercise angle (p=0.28, p=0.03, and p=0.47, respectively). CONCLUSIONS: Post-EEX, immediate MLL was more beneficial than delayed MLL in restoring muscle function and modulating inflammatory cell infiltration. These findings invite similar human studies in order to make definitive conclusions on optimal timing of massage-based therapies. HubMed – rehab
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