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Journal articles on the topic 'Detection of bilateral asymmetries'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

MEADOR, K. J., J. D. ALLISON, D. W. LORING, T. B. LAVIN, and J. J. PILLAI. "Topography of somatosensory processing: Cerebral lateralization and focused attention." Journal of the International Neuropsychological Society 8, no. 3 (March 2002): 349–59. http://dx.doi.org/10.1017/s1355617702813169.

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Healthy dextrals underwent fMRI during a task of graphesthesia requiring detection of any number written consecutively from an otherwise random number sequence. Test conditions included (1) focus on unilateral right hand stimuli, (2) focus on unilateral left hand stimuli, (3) focus on right hand only during bilateral hand stimulation, (4) focus on left hand only during bilateral hand stimulation, and (5) rest. Attention to unilateral hand stimulation produced bihemispheric activation with minimal or no activation of ipsilateral primary sensorimotor region. Attention to unilateral left hand stimuli resulted in more activation than attention to unilateral right hand stimuli. Stimulation of the nonattended hand activated the contralateral somatosensory area, but to a lesser spatial extent than attended stimuli. Comparing focused attention to the left versus right side during identical sensory inputs (i.e., bilateral hand stimulation), focused attention to the right hand increased activation in the left somatosensory region, but focused attention to the left hand increased activation in both cerebral hemispheres. Thus, focused attention to unilateral somatosensory stimuli produces bilateral cerebral activation, but the increase in blood flow is greater in the contralateral hemisphere. Unattended stimuli activate the contralateral primary somatosensory area. Left/right asymmetries were demonstrated consistent with cerebral lateralization. (JINS, 2002, 8, 349–359.)

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Chen, Bing, Sina Sangari, Jakob Lorentzen, Jens B. Nielsen, and Monica A. Perez. "Bilateral and asymmetrical contributions of passive and active ankle plantar flexors stiffness to spasticity in humans with spinal cord injury." Journal of Neurophysiology 124, no. 3 (September 1, 2020): 973–84. http://dx.doi.org/10.1152/jn.00044.2020.

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Spasticity affects a number of people with spinal cord injury (SCI). Using biomechanical, electrophysiological, and clinical assessments, we found that passive muscle properties and active spinal reflex mechanisms contribute bilaterally and asymmetrically to spasticity in ankle plantarflexor muscles in humans with chronic SCI. A self-reported questionnaire had poor agreement with the Modified Ashworth Scale in detecting asymmetries in spasticity. The nature of these changes might contribute to the poor sensitivity of clinical exams.

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Fang, Tao, Yingle Fan, and Wei Wu. "Salient contour detection on the basis of the mechanism of bilateral asymmetric receptive fields." Signal, Image and Video Processing 14, no. 7 (May 7, 2020): 1461–69. http://dx.doi.org/10.1007/s11760-020-01689-1.

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4

Pesin, Jimy, Anna Faingersh, Dan Waisman, and Amir Landesberg. "Highly sensitive monitoring of chest wall dynamics and acoustics provides diverse valuable information for evaluating ventilation and diagnosing pneumothorax." Journal of Applied Physiology 116, no. 12 (June 15, 2014): 1632–40. http://dx.doi.org/10.1152/japplphysiol.00966.2013.

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Current practice of monitoring lung ventilation in neonatal intensive care units, utilizing endotracheal tube pressure and flow, end-tidal CO2, arterial O2 saturation from pulse oximetry, and hemodynamic indexes, fails to account for asymmetric pathologies and to allow for early detection of deteriorating ventilation. This study investigated the utility of bilateral measurements of chest wall dynamics and sounds, in providing early detection of changes in the mechanics and distribution of lung ventilation. Nine healthy New Zealand rabbits were ventilated at a constant pressure, while miniature accelerometers were attached to each side of the chest. Slowly progressing pneumothorax was induced by injecting 1 ml/min air into the pleural space on either side of the chest. The end of the experiment ( tPTX) was defined when arterial O2 saturation from pulse oximetry dropped <90% or when vigorous spontaneous breathing began, since it represents the time of clinical detection using common methods. Consistent and significant changes were observed in 15 of the chest dynamics parameters. The most meaningful temporal changes were noted for features extracted from subsonic dynamics (<10 Hz), e.g., tidal amplitude, energy, and autoregressive poles. Features from the high-frequency band (10–200 Hz), e.g., energy and entropy, exhibited smaller but significant changes. At 70% tPTX, identification of asymmetric ventilation was attained for all animals. Side identification of the pneumothorax was achieved at 50% tPTX, within a 95% confidence interval. Diagnosis was, on average, 34.1 ± 18.8 min before tPTX. In conclusion, bilateral monitoring of the chest dynamics and acoustics provide novel information that is sensitive to asymmetric changes in ventilation, enabling early detection and localization of pneumothorax.

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Madhavi M., Vijaya, and T. Christy Bobby. "ASSESSMENT OF ASYMMETRY IN BILATERAL STATIC FRONTAL BREAST THERMOGRAMS USING DIFFERENCE IMAGE AND RADIOMIC FEATURES." Biomedical Sciences Instrumentation 57, no. 2 (April 1, 2021): 256–64. http://dx.doi.org/10.34107/yhpn9422.04256.

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Asymmetry analysis of bilateral thermogram images is an important preliminary approach for breast cancer detection. The purpose of this work is to develop an automated algorithm to detect and classify symmetric and asymmetric bilateral static frontal breast thermograms (N=63). The images are pre-processed using anisotropic diffusion filter for removal of noise. Further, segmentation of complete breast region is carried out using level set segmentation without re-initialization. The bifurcation point is computed from the intersection point of interior inframammary curves attained using polynomial curve fitting on the boundary pixels. The obtained breast region is sliced vertically along this bifurcation point to obtain right and left breast sections. Image subtraction is performed between right breast image and flipped left breast image to obtain the difference image. The obtained difference image is sharpened and 144 texture features such as first-order statistical, co- occurrence, run length and laws energy features are extracted and Absolute Difference (AD) between symmetric and asymmetric subjects for each feature is computed. The features for which the value of AD is greater than 0.1 is considered as substantial features. Twenty four substantial features are obtained and are given as an input to Least Square Support Vector Machine (LSSVM) to automate the classification. The results shows that the maximum segmentation overlap measure obtained is 98.3%. The classification accuracy obtained using LSSVM with Radial Basis Function (RBF) is 95.65% and sensitivity, specificity and Area Under the Curve (AUC) are 100%, 90.9% and 0.9545 respectively. Thus the proposed methodology appears to be effective in detecting asymmetric heat patterns and hence can be deployed in thermal screening systems.

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Shen, Yanguang, Jinlong Zhang, Peng Song, Lu Ma, Yan Zhong, Xiaojing Zhang, Haiyi Wang, et al. "A Preliminary Study of Gadobenate Dimeglumine Enhanced Magnetic Resonance Angiography Detection of Prostatic Artery Anatomy." Journal of Medical Imaging and Health Informatics 10, no. 3 (March 1, 2020): 560–65. http://dx.doi.org/10.1166/jmihi.2020.2974.

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Background: To describe the feasibility of anatomy and imaging findings of the prostatic arteries (PAs) on contrast-enhanced MR angiography (ce-MRA). Methods: This prospective study enrolled 7 patients undergoing pelvic 3.0 T ce-MRA and selective pelvic digital subtraction angiography before prostatic artery embolization (PAE). Four patients underwent fluoroscopically triggered ce-MRA and 3 patients underwent time-resolved imaging of contrast kinetics. PAE was performed within one week of MRA. Two radiologists independently analyzed MRA findings. The analyzed parameters included the number of independent PAs and their origin, trajectory, and anastomoses with adjacent arteries. Image quality in terms of signal-to-noise ratio (SNR) and contrast-tonoise ratio (CNR) to visualize common iliac artery and its branches including prostatic arteries was compared between the two groups. Results: A total of 17 PAs were demonstrated in 7 cases. The diagnostic accuracy of MRA in detecting bilateral PAs was 58.82%. Moreover, 71.42% of the patients had only one PA in one side, and 7.14% had independent PAs. The mean diameter of 10 PAs was 1.39 ± 0.46 mm. About 29.41% of PAs originated from the obturator arteries and 29.41% from the pudendal arteries. Bilateral PAs were found to be symmetric in 3 cases and asymmetric in 4 cases. No significance difference was found between the image quality of the two groups, except for the signal intensity of the right common iliac artery and right internal iliac artery and SNR and CNR of the left common iliac artery. Conclusions: This study shows that ce-MRA is able to detect PA, and can provide guidance for PAE.

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Rehman, Hafiz, and Sungon Lee. "An Efficient Automatic Midsagittal Plane Extraction in Brain MRI." Applied Sciences 8, no. 11 (November 9, 2018): 2203. http://dx.doi.org/10.3390/app8112203.

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In this paper, a fully automatic and computationally efficient midsagittal plane (MSP) extraction technique in brain magnetic resonance images (MRIs) has been proposed. Automatic detection of MSP in neuroimages can significantly aid in registration of medical images, asymmetric analysis, and alignment or tilt correction (recenter and reorientation) in brain MRIs. The parameters of MSP are estimated in two steps. In the first step, symmetric features and principal component analysis (PCA)-based technique is used to vertically align the bilateral symmetric axis of the brain. In the second step, PCA is used to achieve a set of parallel lines (principal axes) from the selected two-dimensional (2-D) elliptical slices of brain MRIs, followed by a plane fitting using orthogonal regression. The developed algorithm has been tested on 157 real T1-weighted brain MRI datasets including 14 cases from the patients with brain tumors. The presented algorithm is compared with a state-of-the-art approach based on bilateral symmetry maximization. Experimental results revealed that the proposed algorithm is fast (<1.04 s per MRI volume) and exhibits superior performance in terms of accuracy and precision (a mean z-distance of 0.336 voxels and a mean angle difference of 0.06).

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Promsri, Arunee, Thomas Haid, Inge Werner, and Peter Federolf. "Leg Dominance Effects on Postural Control When Performing Challenging Balance Exercises." Brain Sciences 10, no. 3 (February 25, 2020): 128. http://dx.doi.org/10.3390/brainsci10030128.

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Leg dominance reflects the preferential use of one leg over another and is typically attributed to asymmetries in the neural circuitry. Detecting leg dominance effects on motor behavior, particularly during balancing exercises, has proven difficult. The current study applied a principal component analysis (PCA) on kinematic data, to assess bilateral asymmetry on the coordinative structure (hypothesis H1) or on the control characteristics of specific movement components (hypothesis H2). Marker-based motion tracking was performed on 26 healthy adults (aged 25.3 ± 4.1 years), who stood unipedally on a multiaxial unstable board, in a randomized order, on their dominant and non-dominant leg. Leg dominance was defined as the kicking leg. PCA was performed to determine patterns of correlated segment movements (“principal movements” PMks). The control of each PMk was characterized by assessing its acceleration (second-time derivative). Results were inconclusive regarding a leg-dominance effect on the coordinative structure of balancing movements (H1 inconclusive); however, different control (p = 0.005) was observed in PM3, representing a diagonal plane movement component (H2 was supported). These findings supported that leg dominance effects should be considered when assessing or training lower-limb neuromuscular control and suggest that specific attention should be given to diagonal plane movements.

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9

Ericeira, Daniel Rodrigues, Aristófanes Corrêa Silva, Anselmo Cardoso de Paiva, and Marcelo Gattass. "Detection of masses based on asymmetric regions of digital bilateral mammograms using spatial description with variogram and cross-variogram functions." Computers in Biology and Medicine 43, no. 8 (September 2013): 987–99. http://dx.doi.org/10.1016/j.compbiomed.2013.04.019.

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10

Salvietti, Gionata, Leonardo Meli, Guido Gioioso, Monica Malvezzi, and Domenico Prattichizzo. "Multicontact Bilateral Telemanipulation With Kinematic Asymmetries." IEEE/ASME Transactions on Mechatronics 22, no. 1 (February 2017): 445–56. http://dx.doi.org/10.1109/tmech.2016.2606895.

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11

Garrett, Jinzhuo Z. "Explaining asymmetries in bilateral FDI flows." International Review of Economics & Finance 41 (January 2016): 155–71. http://dx.doi.org/10.1016/j.iref.2015.08.014.

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12

Myslobodsky, M. S., J. Bar-Ziv, H. van Praag, and J. Glicksohn. "Bilateral alpha distribution and anatomic brain asymmetries." Brain Topography 1, no. 4 (June 1989): 229–35. http://dx.doi.org/10.1007/bf01129600.

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13

Earp, Jacob E., Ariana Cambio, Domenic Angelino, Nick Chartier, Connor Duff, Shelby Downing, Susan D'Andrea, and Disa Hatfield. "Functional Bilateral Asymmetries In Adolescent Competitive Skiers." Medicine & Science in Sports & Exercise 52, no. 7S (July 2020): 66. http://dx.doi.org/10.1249/01.mss.0000670744.95656.99.

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14

Chalker, Wade J., Anthony J. Shield, David A. Opar, and Justin W. L. Keogh. "Comparisons of eccentric knee flexor strength and asymmetries across elite, sub-elite and school level cricket players." PeerJ 4 (February 18, 2016): e1594. http://dx.doi.org/10.7717/peerj.1594.

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Background.There has been a continual increase in injury rates in cricket, with hamstring strain injuries (HSIs) being the most prominent. Eccentric knee flexor weakness and bilateral asymmetries are major modifiable risk factors for future HSIs. However, there is a lack of data relating to eccentric hamstring strength in cricket at any skill level. The objective of this study was to compare eccentric knee flexor strength and bilateral asymmetries in elite, sub-elite and school level cricket players; and to determine if playing position and limb role influenced these eccentric knee flexor strength indices.Methods.Seventy four male cricket players of three distinct skill levels performed three repetitions of the Nordic hamstring exercise on the experimental device. Strength was assessed as the absolute and relative mean peak force output for both limbs, with bilateral asymmetries. Differences in mean peak force outputs between skill level and playing positions were measured.Results.There were no significant differences between elite, sub-elite and school level athletes for mean peak force and bilateral asymmetries of the knee flexors. There were no significant differences observed between bowler’s and batter’s mean peak force and bilateral asymmetries. There were no significant differences between front and back limb mean peak force outputs.Discussion.Skill level, playing position and limb role appeared to have no significant effect on eccentric knee flexor strength and bilateral asymmetries. Future research should seek to determine whether eccentric knee flexor strength thresholds are predictive of HSIs in cricket and if specific eccentric knee flexor strengthening can reduce these injuries.

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Meigen, Thomas, Wolf-Dietrich Lagreze, and Michael Bach. "Asymmetries in preattentive line detection." Vision Research 34, no. 23 (December 1994): 3103–9. http://dx.doi.org/10.1016/0042-6989(94)90076-0.

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16

López-Fernández, Jorge, Jorge García-Unanue, Javier Sánchez-Sánchez, Enrique Colino, Enrique Hernando, and Leonor Gallardo. "Bilateral Asymmetries Assessment in Elite and Sub-Elite Male Futsal Players." International Journal of Environmental Research and Public Health 17, no. 9 (May 2, 2020): 3169. http://dx.doi.org/10.3390/ijerph17093169.

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This study aimed to investigate morphological, functional, and neuromuscular asymmetries on futsal players’ lower limbs at different competitive levels. Sixteen male elite futsal players from the Spanish National Futsal League and thirteen male sub-elite futsal players from the third division participated in this study. Morphological asymmetry was assessed through bioelectrical impedance (fat-mass (g and %) and lean-mass (g)). Functional asymmetry was assessed by means of a 20-s static unipedal balance test. Finally, neuromuscular asymmetry was assessed using tensiomiography tests on both the rectus femoris (RF) and biceps femoris (BF) of each participant. The three tests conducted did not reveal significant bilateral asymmetries in elite players. On the other hand, sub-elite players showed significant bilateral asymmetry in fat-mass percentage between dominant and non-dominant limbs (+6%; CI95%: 1 to 11; ES: 0.88; p = 0.019). They also showed higher bilateral asymmetry in the delay time of the RF (+13%; CI95%: 7 to 21; ES: 1.3; p < 0.05). However, the static unipedal balance test (p > 0.05) did not evidence asymmetries regardless of the level of the participants. Elite futsal players do not develop bilateral asymmetries in lower limbs in the studied parameters. On the contrary, sub-elite players are likely to develop morphological and neuromuscular asymmetries between their dominant leg and non-dominant leg.

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Harris, Edward F., and Katherine Bodford. "Bilateral Asymmetry in the Tooth Relationships of Orthodontic Patients." Angle Orthodontist 77, no. 5 (September 1, 2007): 779–86. http://dx.doi.org/10.2319/081606-335.

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Abstract Objective: To quantify the nature and extent of bilateral dentoalveolar asymmetries in routine adolescent orthodontic patients. Materials and Methods: Eight left-right pairs of occlusal dimensions were measured from dental casts (n = 211 subjects) with proportionate samples of class I, II, and III malocclusions. Results: Directional asymmetry is a subtle, but pervasive feature of the dental arches, with systematically larger dimensions on the left side. Prior studies attribute this sidedness to compensations for hemispheric laterality. Patient's sex did not influence the magnitude of asymmetry, but patients with class II malocclusion exhibited significantly greater asymmetries, particularly in the anterior segment. Inspection suggests that this is attributable to the lack of coupling and guidance of the teeth between the jaws. There is a significant association between the severity of class II buccal-segment relationship and the extent of left-right asymmetries. Conclusion: Clinically, these lateralities need to be anticipated, particularly in class II malocclusions, and incorporated into the treatment plan.

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Ohmori, Hiroko, Hiroaki Kirimoto, and Kunimichi Soma. "Bilateral asymmetries in periodontal-masseteric reflex activity in man." Orthodontic Waves 68, no. 4 (December 1, 2009): 147–51. http://dx.doi.org/10.1016/j.odw.2009.03.003.

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Orlando, S., F. Bocchino, F. Reale, G. Peres, and O. Petruk. "On the origin of asymmetries in bilateral supernova remnants." Astronomy & Astrophysics 470, no. 3 (May 25, 2007): 927–39. http://dx.doi.org/10.1051/0004-6361:20066045.

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Palmer, A. Richard, Curtis Strobeck, and Adam K. Chippindale. "Bilateral variation and the evolutionary origin of macroscopic asymmetries." Genetica 89, no. 1-3 (February 1993): 201–18. http://dx.doi.org/10.1007/bf02424514.

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Berezovchuk, L. V., and M. E. Makarchuk. "About bioelectric buffer system of the brain." Klinicheskaia khirurgiia 87, no. 7-8 (September 30, 2020): 53–57. http://dx.doi.org/10.26779/2522-1396.2020.7-8.53.

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Objective. Elaboration of objective quantitative criterion of electroencephalogram for estimation of the brain functional state in man. Маterials and methods. The background electroencephalograms analysis was conducted in 6 groups of the examined patients with various diagnosis (41 patients at all). Control group consisted of 7 patients, ageing 20 - 56 yrs (average age 35 yrs). Recording of EEG was conducted, using 16-channel electroencephalograph «NeuroCom standart» (KhАI - Меdika, Ukraine) in accordance to international system of recording «10-20». There were analyzed a quantity of meaningful interhemispheric asymmetries in accordance to power of summarized bioelectric signal in bilateral-synchronous points of the head in every group. The analysis time have constituted 1 min. Results. There was established, that the least meaningful difference in accordance to the bioelectrical signal power in bilateral-synchronous points of head may be considered in 1.4 times. Quantity of meaningful interhemispheric asymmetries in man may vary in large diapason - from 9 tо 25. Not all meaningful interhemispheric asymmetries in accordance to power of signals of separate rhythms are preserved while doing analysis of meaningful interhemispheric asymmetries in accordance to power of a summarized bioelectrical signal. Interhemispheric asymmetries in accordance to power of the summarized bioelectric signal in bilateral-synchronous points of the head may have more important informative meaning, than interhemispheric asymmetry in accordance to the signals power of separate rhythms. Conclusion. Quantity of meaningful interhemispheric asymmetries in accordance to power of signals of separate rhythms in healthy persons may vary from 16 tо 18. The interhemispheric asymmetries quantity reduction in accordance to power of the summarized bioelectric signal, comparing with quantity of interhemispheric asymmetries in accordance to power of signals of separate rhythms more than in 4 times, witnesses presence of the brain bioelectrical buffer system.

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Iyilikci, Osman, Cordula Becker, Onur Güntürkün, and Sonia Amado. "Visual Processing Asymmetries in Change Detection." Perception 39, no. 6 (January 2010): 761–69. http://dx.doi.org/10.1068/p6623.

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23

Bini, Rodrigo R., Tiago C. Jacques, Felipe P. Carpes, and Marco A. Vaz. "Effectiveness of pedalling retraining in reducing bilateral pedal force asymmetries." Journal of Sports Sciences 35, no. 14 (August 2016): 1336–41. http://dx.doi.org/10.1080/02640414.2016.1215505.

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Reiser, Raoul F., and Joseph M. Maines. "Assessment of Ground Reaction Force Bilateral Asymmetries During Manual Lifting." Medicine & Science in Sports & Exercise 36, Supplement (May 2004): S170. http://dx.doi.org/10.1097/00005768-200405001-00812.

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Sauls, Nicole M., Luis E. Segura, Christopher Perez, Henry Velasquez, Jason Ng, Guillermo Esacalante, and Nicole C. Dabbs. "The Relationship Between Bilateral Asymmetries And Explosive Lower-Body Performance." Medicine & Science in Sports & Exercise 49, no. 5S (May 2017): 962. http://dx.doi.org/10.1249/01.mss.0000519626.51407.ce.

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Shultz, Sandra J., and Anh-Dung Nguyen. "Bilateral Asymmetries in Clinical Measures of Lower-Extremity Anatomic Characteristics." Clinical Journal of Sport Medicine 17, no. 5 (September 2007): 357–61. http://dx.doi.org/10.1097/jsm.0b013e31811df950.

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Reiser, Raoul F., and Joseph M. Maines. "Assessment of Ground Reaction Force Bilateral Asymmetries During Manual Lifting." Medicine & Science in Sports & Exercise 36, Supplement (May 2004): S170. http://dx.doi.org/10.1249/00005768-200405001-00812.

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Mason, Barry S., Riemer J. K. Vegter, Thomas A. W. Paulson, Dylan Morrissey, Jan W. van der Scheer, and Victoria L. Goosey-Tolfrey. "Bilateral scapular kinematics, asymmetries and shoulder pain in wheelchair athletes." Gait & Posture 65 (September 2018): 151–56. http://dx.doi.org/10.1016/j.gaitpost.2018.07.170.

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Lobbezoo, F., H. W. van der Glas, A. van der Bilt, R. Buchner, and F. Bosman. "Bilateral asymmetries in the jaw-jerk reflex activity in man." Archives of Oral Biology 38, no. 8 (August 1993): 689–98. http://dx.doi.org/10.1016/0003-9969(93)90009-b.

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Santos, Gislaine Regina Santos dos, Jeam Marcel Geremia, Paola Zambelli Moraes, Raquel de Oliveira Lupion, Marco Aurélio Vaz, and Felipe P. Carpes. "Bilateral assessment of knee muscle relationships in healthy adults." Motriz: Revista de Educação Física 20, no. 3 (September 2014): 310–16. http://dx.doi.org/10.1590/s1980-65742014000300010.

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Asymmetric performance of flexor and extensor muscles of the knee may be a risk factor for knee injuries, especially the anterior cruciate ligament. Additionally, asymmetries in power and work may have correlations with fatigue and performance during functional tasks. Among untrained individuals, such asymmetries may be of potential interest for training prescription. Here, we investigated the bilateral performance of knee flexors and extensors muscle groups of untrained individuals. We quantified the torque-angle and torque-velocity relationships, as well as work, power and asymmetry indexes in 20 untrained male (25 ± 4 years old; height 1.74 ± 0.05 m; body mass 76 ± 9 kg). No significant asymmetry was observed for torque-angle and torque-velocity relationships, work and power output for knee flexor and extensor muscle groups (p < .05). Our results suggest that untrained male present symmetry in the knee flexion and extension bilateral performance. Changes in this behavior due to physical training must be monitored.

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Larson, Rebecca D., Monica Barton, John W. Farrell III, Gregory S. Cantrell, David J. Lantis, Christopher D. Black, and Carl J. Ade. "Evaluation of Oxygen Uptake Kinetic Asymmetries in Patients with Multiple Sclerosis: A Pilot Study." International Journal of Kinesiology and Sports Science 6, no. 4 (October 31, 2018): 21. http://dx.doi.org/10.7575/aiac.ijkss.v.6n.4p.21.

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Background of Study: Observations of limb to limb differences (bilateral asymmetry) in leg strength, power, peak oxygen uptake (VO2) and bone mineral density has been reported in individuals with Multiple Sclerosis (MS). Objetives: The purpose of this study was to quantify the magnitude of bilateral asymmetries in oxygen uptake (VO2) kinetics response to single leg cycling (SLC) in relapsing-remitting multiple sclerosis (MS) patients. Methods: Five MSpatients (2 men, 3 women; age 43±7 yrs) performed constant work rate SLC trials to determine VO2 kinetics in each leg. Asymmetry scores were used to quantify the magnitude of the bilateral asymmetries. Results: Significant asymmetries were seen in VO2 peak and parameters of VO2 kinetics. VO2peak asymmetry score was significantly different than 0% (p=0.015). Similarly,significant asymmetry for VO2 kinetic response to exercise as mean response time was observed (p=0.03). In addition the VO2 response to exercise resulted in a significant asymmetry in VO2 deficit between legs (p=0.03). No correlation between EDSS scores and any asymmetry scores existed. Conclusions: These findings provide insight into the potential differences in metabolic perturbation and limb specific symptomatic fatigue within the MS population.

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Vagenas, George, and Blaine Hoshizaki. "Functional Asymmetries and Lateral Dominance in the Lower Limbs of Distance Runners." International Journal of Sport Biomechanics 7, no. 4 (November 1991): 311–29. http://dx.doi.org/10.1123/ijsb.7.4.311.

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This study investigated the phenomenon of lower extremity functional asymmetries in a group of competitive male distance runners (N= 29). Bilateral measurements were taken to assess selected variables of the talocalcaneal flexibility (goniometry) and of the isokinetic knee strength (Cybex II). Data analysis revealed significant asymmetries for both lower extremity functional parameters. The subjects were symmetric in the total range of motion of the subtalar joint and inversely asymmetric in the range of motion of calcaneal eversion and calcaneal inversion. The laterality patterns of functional asymmetries were found to be consistent and independent of the conventional upper and lower extremity lateral preferences. It was theorized that asymmetries in the lower extremities are characterized by joint-specific trends of bilateralism.

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Calabro, Finnegan J., and Monica A. Perez. "Bilateral reach-to-grasp movement asymmetries after human spinal cord injury." Journal of Neurophysiology 115, no. 1 (January 1, 2016): 157–67. http://dx.doi.org/10.1152/jn.00692.2015.

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Cervical spinal cord injury (SCI) in humans typically damages both sides of the spinal cord, resulting in asymmetric functional impairments in the arms. Despite this well-accepted notion and the growing emphasis on the use of bimanual training strategies, how movement of one arm affects the motion of the contralateral arm after SCI remains unknown. Using kinematics and multichannel electromyographic (EMG) recordings we studied unilateral and bilateral reach-to-grasp movements to a small and a large cylinder in individuals with asymmetric arm impairments due to cervical SCI and age-matched control subjects. We found that the stronger arm of SCI subjects showed movement durations longer than control subjects during bilateral compared with unilateral trials. Specifically, movement duration was prolonged when opening and closing the hand when reaching for a large and a small object, respectively, accompanied by deficient activation of finger flexor and extensor muscles. In subjects with SCI interlimb coordination was reduced compared with control subjects, and individuals with lesser coordination between hands were those who showed prolonged times to open the hand. Although the weaker arm showed movement durations during bilateral compared with unilateral trials that were proportional to controls, the stronger arm was excessively delayed during bilateral reaching. Altogether, our findings demonstrate that during bilateral reach-to-grasp movements the more impaired arm has detrimental effects on hand opening and closing of the less impaired arm and that they are related, at least in part, to deficient control of EMG activity of hand muscles. We suggest that hand opening might provide a time to drive bimanual coordination adjustments after human SCI.

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Teixeira, Luis Augusto, Marcus Vinicius Silva, and Maikel Carvalho. "Reduction of lateral asymmetries in dribbling: The role of bilateral practice." Laterality: Asymmetries of Body, Brain and Cognition 8, no. 1 (January 2003): 53–65. http://dx.doi.org/10.1080/713754469.

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Wimbish, Jasmine, Christina N. Cooper, Elizabeth Montes, Lauren Bryant, Jason Ng, Guillermo Esacalante, and Nicole C. Dabbs. "Sex Differences In Bilateral And Unilateral Asymmetries In Recreationally Trained Individuals." Medicine & Science in Sports & Exercise 49, no. 5S (May 2017): 604. http://dx.doi.org/10.1249/01.mss.0000518581.56513.3b.

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Vagenas, George, and Blaine Hoshizaki. "Evaluation of Rearfoot Asymmetries in Running with Worn and New Running Shoes." International Journal of Sport Biomechanics 4, no. 3 (August 1988): 220–30. http://dx.doi.org/10.1123/ijsb.4.3.220.

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The purpose of this study was to identify the kinematic characteristics of bilateral rearfoot asymmetry during heel–toe running under two experimental conditions: worn (broken-in) running shoes and new (standardized) running shoes. High-speed cinematography (150 fps) was used to film the lower limbs of four male runners in the frontal plane while running on a treadmill at their training pace. Six successive footfalls were analyzed for each subject and selected kinematical variables of the rearfoot function were calculated. Significant asymmetries were found in lower leg angle and Achilles tendon angle at touchdown and at maximum pronation. Total pronation and rearfoot angle were almost symmetric. The angular displacement graphs for the shank and foot revealed a distinct overall asymmetry between the lower limbs in both conditions. The mean values of the kinematical asymmetries were appreciably higher in the new shoe condition. It is proposed that the degree of these asymmetries is subject to changes due to injury, personal running style, and stability of the running shoe. Trends of bilateral dominance specific to rearfoot control in running were identified.

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Fuhrmeister, B., J. H. M. M. Schmitt, and P. H. Hauschildt. "Detection of red line asymmetries in LHS 2034." Astronomy & Astrophysics 436, no. 2 (May 30, 2005): 677–86. http://dx.doi.org/10.1051/0004-6361:20042518.

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38

Corballis, Michael C. "Bilaterally Symmetrical: To Be or Not to Be?" Symmetry 12, no. 3 (February 25, 2020): 326. http://dx.doi.org/10.3390/sym12030326.

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We belong to a clade of species known as the bilateria, with a body plan that is essentially symmetrical with respect to left and right, an adaptation to the indifference of the natural world to mirror-reflection. Limbs and sense organs are in bilaterally symmetrical pairs, dictating a high degree of symmetry in the brain itself. Bilateral symmetry can be maladaptive, though, especially in the human world where it is important to distinguish between left and right sides, and between left-right mirror images, as in reading directional scripts. The brains of many animals have evolved asymmetries, often but not exclusively in functions not dependent on sensory input or immediate reaction to the environment. Brain asymmetries in humans have led to exaggerate notions of a duality between the sides of the brain. The tradeoff between symmetry and asymmetry results in individual differences in brain asymmetries and handedness, contributing to a diversity of aptitude and divisions of labor. Asymmetries may have their origin in fundamental molecular asymmetries going far back in biological evolution.

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Papousek, I., and G. Schulter. "Relationships between EEG asymmetries and bilateral EDA and possible relevance for psychosomatics." International Journal of Psychophysiology 25, no. 1 (January 1997): 20. http://dx.doi.org/10.1016/s0167-8760(97)85381-0.

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Maloney, Sean J., Iain M. Fletcher, and Joanna Richards. "A comparison of methods to determine bilateral asymmetries in vertical leg stiffness." Journal of Sports Sciences 34, no. 9 (July 31, 2015): 829–35. http://dx.doi.org/10.1080/02640414.2015.1075055.

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41

Gueugnon, Mathieu, Kjerstin Torre, Denis Mottet, and François Bonnetblanc. "Asymmetries of bilateral isometric force matching with movement intention and unilateral fatigue." Experimental Brain Research 232, no. 6 (February 20, 2014): 1699–706. http://dx.doi.org/10.1007/s00221-014-3862-8.

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42

Pfeifle, Jonas, David Hasler, and Nicola A. Maffiuletti. "Should We Use Unilateral or Bilateral Tasks to Assess Maximal and Explosive Knee Extensor Strength in Patients with Knee Osteoarthritis? A Cross-Sectional Study." Journal of Clinical Medicine 10, no. 19 (September 24, 2021): 4353. http://dx.doi.org/10.3390/jcm10194353.

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Deficits in maximal and explosive knee extensor strength, which are usually assessed with unilateral tasks, are substantial in patients with knee osteoarthritis (KOA). The aim of this study was to investigate the clinical relevance of unilateral vs. bilateral tasks for assessing knee extensor strength in patients with KOA. This was achieved primarily by comparing unilateral and bilateral inter-limb strength asymmetries and secondarily by examining the relationship between unilaterally and bilaterally measured strength, and performance-based and self-reported function. Twenty-four patients with unilateral KOA (mean age: 65 ± 7 years) performed isometric gradual and explosive maximal voluntary contractions to assess, respectively their maximal and explosive strength. Performance-based and self-reported function were also evaluated with standard functional tests and questionnaires, respectively. Inter-limb asymmetries of maximal and explosive strength did not differ significantly between unilateral (mean asymmetry: 26 ± 15%) and bilateral tasks (22 ± 21%). In the same way, the relationships between knee extensor strength—measured either unilaterally or bilaterally—and performance-based or self-reported function were not influenced by the type of task. In conclusion, it does not seem to make a difference in terms of clinical relevance whether maximal and explosive knee extensor strength are evaluated with unilateral or bilateral tasks in KOA patients.

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Shu, Ni, Yaou Liu, Yunyun Duan, and Kuncheng Li. "Hemispheric Asymmetry of Human Brain Anatomical Network Revealed by Diffusion Tensor Tractography." BioMed Research International 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/908917.

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The topological architecture of the cerebral anatomical network reflects the structural organization of the human brain. Recently, topological measures based on graph theory have provided new approaches for quantifying large-scale anatomical networks. However, few studies have investigated the hemispheric asymmetries of the human brain from the perspective of the network model, and little is known about the asymmetries of the connection patterns of brain regions, which may reflect the functional integration and interaction between different regions. Here, we utilized diffusion tensor imaging to construct binary anatomical networks for 72 right-handed healthy adult subjects. We established the existence of structural connections between any pair of the 90 cortical and subcortical regions using deterministic tractography. To investigate the hemispheric asymmetries of the brain, statistical analyses were performed to reveal the brain regions with significant differences between bilateral topological properties, such as degree of connectivity, characteristic path length, and betweenness centrality. Furthermore, local structural connections were also investigated to examine the local asymmetries of some specific white matter tracts. From the perspective of both the global and local connection patterns, we identified the brain regions with hemispheric asymmetries. Combined with the previous studies, we suggested that the topological asymmetries in the anatomical network may reflect the functional lateralization of the human brain.

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Gonzalo-Skok, Oliver, Alejandro Moreno-Azze, José Luis Arjol-Serrano, Julio Tous-Fajardo, and Chris Bishop. "A Comparison of 3 Different Unilateral Strength Training Strategies to Enhance Jumping Performance and Decrease Interlimb Asymmetries in Soccer Players." International Journal of Sports Physiology and Performance 14, no. 9 (October 1, 2019): 1256–64. http://dx.doi.org/10.1123/ijspp.2018-0920.

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Purpose:To compare the effects of performing different unilateral strength training interventions on unilateral and bilateral jumping performance and their related asymmetries in young soccer players.Methods:Forty-five young (U-17) male soccer players were randomly assigned to 3 eccentric overload training programs. The first group executed the same volume with both legs starting with the weaker leg (SVW, n = 15); the second group carried out double volume with the weaker leg and also starting with the weaker leg (DVW, n = 15); and the third group performed the same volume with both legs starting with the stronger leg (SVS, n = 15). Jumping-performance assessment included a single-leg horizontal jump test, a triple single-leg horizontal jump test, a bilateral countermovement jump (CMJ) test, and a unilateral CMJ test. Asymmetries were also analyzed in the unilateral jumping tests.Results:CMJ was improved (effect size [ES]: 0.27–0.48) and CMJ asymmetry was possibly reduced (ES: 0.08–0.24) in all groups. Substantial improvements were found in triple hop (ES: 0.52–0.71) in SVW and DVW, and triple-hop asymmetry was substantially decreased (ES: 0.88) in DVW. Between-groups analysis showed a substantially better performance in triple hop and horizontal hop with right leg in SVW and DVW compared with SVS.Conclusions:Unilateral strength training programs were shown to substantially improve bilateral jumping performance, while unilateral jumping was substantially enhanced in the groups that started the training session with the weaker leg. Finally, between-limbs asymmetries in the triple hop were mainly reduced through performing double volume with the weaker leg.

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Howe, Louis, Theodoros M. Bampouras, Jamie S. North, and Mark Waldron. "Reliability of two-dimensional measures associated with bilateral drop-landing performance." Movement & Sport Sciences - Science & Motricité, no. 108 (2020): 39–47. http://dx.doi.org/10.1051/sm/2019037.

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The aim of this study was to establish the within-session reliability for two-dimensional (2D) video analysis of sagittal- and frontal-plane measures during bilateral drop-landing tasks. Thirty-nine recreational athletes (22 men, 17 women, age = 22 ± 4 years, height = 1.74 ± 0.15 m, body mass 70.2 ± 15.1 kg) performed five bilateral drop-landings from 50, 100 and 150% of maximum countermovement jump height, twice on the same day. Measures of reliability for initial contact angle, peak flexion angle and joint displacement for the hip, knee, and ankle joints, frontal-plane projection angles (FPPA), as well as inter-limb asymmetries in joint displacement were assessed. No systematic bias was present between trials (P>0.05). All kinematic measurements showed relative reliability ranging from large to near perfect (ICC = 0.52–0.96). Absolute reliability ranged between measures, with CV% between 1.0–1.6% for initial contact angles, 1.9–7.9% for peak flexion angles, 5.3–22.4% for joint displacement, and 1.6–2.3% for FPPA. Absolute reliability for inter-limb asymmetries in joint displacement were highly variable, with minimal detectable change values ranging from 6.0–13.2°. Therefore, 2D video analysis is a reliable tool for numerous measures related to the performance of bilateral drop-landings.

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Kiki, Ali, Nihat Kılıç, and Hüsamettin Oktay. "Condylar Asymmetry in Bilateral Posterior Crossbite Patients." Angle Orthodontist 77, no. 1 (January 1, 2007): 77–81. http://dx.doi.org/10.2319/010706-5r.1.

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Abstract Objective: To investigate whether patients with bilateral posterior crossbite have asymmetrically developed condyles. Materials and Methods: The study group consisted of 75 patients with bilateral posterior crossbite, and a control group of 75 subjects with normal occlusion. Condylar, ramal, and condylar plus ramal asymmetry values were computed for all of the subjects on orthopantomograms. Data were analyzed statistically by means of paired t-test and Student's t-test. Results: The patients with bilateral posterior crossbite had more asymmetrical condyles relative to the controls. However, there were no statistically significant differences in condylar, ramal, or condylar plus ramal heights between left and right sides in both the control and crossbite groups. Conclusion: Patients with bilateral posterior crossbite can have asymmetrical condyles and might be at risk for the development of future skeletal mandibular asymmetries.

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Vingrys, Algis J., and Luke E. Mahon. "Color and luminance detection and discrimination asymmetries and interactions." Vision Research 38, no. 8 (April 1998): 1085–95. http://dx.doi.org/10.1016/s0042-6989(97)00250-2.

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Sulakhe, Neil, Lorin J. Elias, and Lisa Lejbak. "Hemispheric asymmetries for gap detection depend on noise type." Brain and Cognition 53, no. 2 (November 2003): 372–75. http://dx.doi.org/10.1016/s0278-2626(03)00146-5.

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Herbert, A. M., O. Overbury, J. Singh, and J. Faubert. "Aging and Bilateral Symmetry Detection." Journals of Gerontology Series B: Psychological Sciences and Social Sciences 57, no. 3 (May 1, 2002): P241—P245. http://dx.doi.org/10.1093/geronb/57.3.p241.

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HUEBNER, KAI, DANIEL WESTHOFF, and JIANWEI ZHANG. "OPTIMIZED QUANTITATIVE BILATERAL SYMMETRY DETECTION." International Journal of Information Acquisition 02, no. 03 (September 2005): 241–49. http://dx.doi.org/10.1142/s021987890500060x.

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In [Westhoff et al., 2005], we proposed a novel method to determine illumination-invariant features in images. The quantitative bilateral symmetry of a given scene is computed using dynamic programming before applying the resulting symmetry image and feature vector signatures to an omnidirectional motion tracking task. Compared to other approaches to symmetry detection in computer vision, the results of our novel algorithm describe symmetry in terms of an absolute region instead of a relative degree. In this paper, we describe further optimizations and details of the proposed Dynamic Programming Symmetry feature detection algorithm (DPS algorithm).

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