scholarly journals The Medial-Lateral Pedal Force Component Correlates with Q-Angle during Steady-State Cycling at Different Workloads and Cadences

2021 ◽  
Vol 11 (3) ◽  
pp. 1004
Author(s):  
Borut Fonda ◽  
Jan Babič ◽  
Nejc Šarabon
Keyword(s):  
Cross Correlation ◽  
Sagittal Plane ◽  
Lateral Force ◽  
Total Force ◽  
Pedal Force ◽  
Knee Movement ◽  
Q Angle ◽  
Significant Difference ◽  
Leg Movement ◽  
Steady State Cycling

Leg movement during cycling is constrained to the pedal/crank path and predominantly occurs in a sagittal plane. Medial-lateral force (FML) applied to the pedals is considered as a waste and does not contribute to the pedaling. The aim of this study was to examine the changes in FML across different cadences and workloads, and to examine the correlation with lateral knee movement (Q-angle). Twenty-two cyclists completed six trials at three workloads (2, 2.5 and 3 W/kg) and three cadences (75, 85, 95 rpm). Forces were recorded from the force pedal mounted to the left side. Absolute and normalized (to the peak total force) FML were compared across conditions and cross-correlation with Q-angle was calculated. Absolute FML was significantly different across cadences and workloads (p < 0.05) with higher absolute FML at higher cadence. There was no significant difference in normalized FML across the three cadences. There was a significant decrease in normalized FML (~10 N) at higher workloads. Statistically significant correlations were found between the FML and Q-angle (R = 0.70–0.77). The results demonstrate the link between the FML and Q-angle in healthy pain-free cyclists during stationary cycling. It has also been observed that smaller normalized magnitude of the FML is present when the force effectiveness is increased.

Modeling the resistance mechanism of passive knee joint flexion and extension for use in rehabilitation equipment

2021 ◽  
pp. 095441192199013
Author(s):  
Mansoor Amiri ◽  
Farhad Tabatabai Ghomsheh ◽  
Farshad Ghazalian
Keyword(s):  
Knee Joint ◽  
Sagittal Plane ◽  
Resistance Mechanism ◽  
Time Dependent ◽  
Coefficient Of Determination ◽  
Joint Movement ◽  
Elastic Coefficient ◽  
Knee Movement ◽  
Joint Flexion ◽  
Flexion And Extension

The purpose of this study was to model the resistance mechanism of Passive Knee Joint Flexion and Extension to create a similar torque mechanism in rehabilitation equipment. In order to better model the behavior of passive knee tissues, it is necessary to exactly calculate the two coefficients of elasticity of time-independent and time-dependent parts. Ten healthy male volunteers (mean height 176.4+/−4.59 cm) participated in this study. Passive knee joint flexion and extension occurred at velocities of 15, 45, and 120 (degree/s), and in five consecutive cycles and within the range of 0 to 100° of knee movement on the sagittal plane on Cybex isokinetic dynamometer. To ensure that the muscles were relaxed, the electrical activity of knee muscles was recorded. The elastic coefficient, (KS) increased with elevating the passive velocity in flexion and extension. The elastic coefficient, (KP) was observed to grow with the passive velocity increase. While, the viscous coefficient (C) diminished with passive velocity rise in extension and flexion. The heightened passive velocity of the motion resulted in increased hysteresis (at a rate of 42%). The desired of passive velocity is lower so that there is less energy lost and the viscoelastic resistance of the tissue in the movement decreases. The Coefficient of Determination, R2 between the model-responses and experimental curves in the extension was 0.96 < R2 < 0.99 and in flexion was 0.95 < R2 < 0.99. This modeling is capable of predicting the true performance of the components of passive knee movement and we can create a resistance mechanism in the rehabilitation equipment to perform knee joint movement. Quantitative measurements of two elastic coefficients of Time-independent and Time-dependent parts passive knee joint coefficients should be used for better accurate simulation the behavior of passive tissues in the knee which is not seen in other studies.

Evaluation of skin displacement in the equine neck

2014 ◽  
Vol 10 (3) ◽  
pp. 181-186 ◽  
Author(s):  
A. Bergh ◽  
A. Egenvall ◽  
E. Olsson ◽  
M. Uhlhorn ◽  
M. Rhodin
Keyword(s):  
Mixed Models ◽  
Sagittal Plane ◽  
Cervical Vertebrae ◽  
Statistical Significance ◽  
Longitudinal Axis ◽  
Joint Motion ◽  
Skin Marker ◽  
Significant Difference ◽  
Axis Parallel ◽  
Kinematic Studies

Kinematic studies, using reflective skin markers, are commonly used to investigate equine joint motion in equitation science and for rehabilitation purposes. In order to interpret the registrations accurately, the degree of skin displacement has been described for the limbs and back, but not yet for the neck. The aim of the present study was to measure sagittal plane skin displacement in the equine neck. Radiopaque skin markers were applied to the skin over the first six cervical vertebrae of six healthy horses. Latero-lateral radiographs were taken in three standardised neck positions in the sagittal plane: control (horizontal neck), ‘on the bit’ and ‘nose to carpus’. The scales of the images were normalised and calculation of skin displacement was done by use of a coordinate system, dividing the displacement along an x-axis parallel to the vertebra's longitudinal axis and a y-axis perpendicular to the x-axis. Mixed models analysis was employed to study the differences in distances in x- and y-directions, and statistical significance was set to PÃ0.05. Between control and ‘nose to carpus’ positions, there were significant differences in skin marker locations, relative to the underlying vertebrae, in the x-direction for C1-6, and in y-direction for C3-6. Between normal and ‘on the bit’ positions, there were significant difference in both x- and y-directions for C6. Differences in marker locations along x- and y-axes, respectively, were 3±9 mm and 44±14 mm. The outcome of this study indicates that skin displacement should be considered when investigating equine neck motion with skin marker methodology.

DOES NAVIGATION TOTAL KNEE REPLACEMENT REALLY MAKE A DIFFERENCE?

2013 ◽  
Vol 16 (02) ◽  
pp. 1350007
Author(s):  
P. Motwani ◽  
A. Jariwala ◽  
N. Valentine
Keyword(s):  
Total Knee Replacement ◽  
Tibial Component ◽  
Sagittal Plane ◽  
Computer Navigation ◽  
Component Alignment ◽  
Tibial Component Alignment ◽  
Significant Difference ◽  
Total Knee ◽  
The Mean

Background: Computer Navigation in Total Knee Replacement (TKR) has completed more than a decade since its inception. From that time, numerous studies have been done to see its effect on the variables of surgery and its outcome. Some studies have shown that it is definitely beneficial while others have negated its superiority over conventional techniques. This is an early outcome study on the results of navigation TKR in terms of alignment and clinical outcome at three years post-operatively. Methods: In the present study, 128 patients who had undergone navigation TKR (128 TKR) between January 2006 and November 2009 were included. The navigation system used was orthoPilot®. Patients were assessed post-operatively at one and three year using knee society score (KSS) and knee function score (KFS). All patients completed one year follow-up and 55 patients completed three year follow-up. From 128 patients, 40 navigated TKR patients operated between November 2007 and 2009 and were compared with 40 patients operated by conventional TKR operated between July 2007 and December 2008. Results: The mean KSS at 1 year post-operatively was 85.60 and at 3 years was 85.87. The mean KFS at 1 year post-operatively was 69.30 and at 3 years was 68.00. There was no statistically significant difference between navigation TKR and conventional TKR in terms of anatomical femoro-tibial alignment, femoral component alignment in coronal and sagittal plane and tibial component alignment in coronal plane. However, there was statistically significant difference between tibial component alignment in sagittal plane (p = 0.000) between both the groups. Conclusion: Computer navigation TKR affords a possibility to place both the femoral and tibial component very precisely without the risk of any greater axis deviation from ideal value. It helps in reducing the outliers in alignment of the limb and that of component and that improves the overall implant survival for a long time post-operatively.

Changes in motor cortex activity during reaching movements with similar hand paths but different arm postures

1995 ◽  
Vol 73 (6) ◽  
pp. 2563-2567 ◽  
Author(s):  
S. H. Scott ◽  
J. F. Kalaska
Keyword(s):  
Motor Cortex ◽  
Sagittal Plane ◽  
Single Cells ◽  
Reaching Movements ◽  
Movement Direction ◽  
Tonic Activity ◽  
Population Vector ◽  
Significant Difference ◽  
Direction Of Movement ◽  
Kinematics And Kinetics

1. Neuronal activity was recorded in the motor cortex of a monkey that performed reaching movements with the use of two different arm postures. In the first posture (control), the monkey used its natural arm orientation, approximately in the sagittal plane. In the second posture (abducted), the monkey had to adduct its elbow nearly to shoulder level to grasp the handle. The path of the hand between targets was similar in both arm postures, but the joint kinematics and kinetics were different. 2. In both postures, the activity of single cells was often broadly tuned with movement direction and static arm posture over the targets. In a large proportion of cells, either the level of tonic activity, the directional tuning, or both, varied between the two postures during the movement and target hold periods. 3. For most directions of movement, there was a statistically significant difference in the direction of the population vector for the two arm postures. Furthermore, whereas the population vector tended to point in the direction of movement for the control posture, there was a poorer correspondence between the direction of movement and the population vector for the abducted posture. These observed changes are inconsistent with the notion that the motor cortex encodes purely hand trajectory in space.

scholarly journals Clinical Significance of PLIF in Restoring L4-S1 Segmental Lordosis of 2-level Isthmic Spondylolisthesis

2021 ◽  
Author(s):  
Jing-Yu Wang ◽  
Fu-Sheng Liu ◽  
Jing Li ◽  
Xiao-Bin Wang
Keyword(s):  
Sagittal Plane ◽  
Pearson Correlation ◽  
Isthmic Spondylolisthesis ◽  
Improvement Rate ◽  
Clinical Prognosis ◽  
Vas Score ◽  
Score Improvement ◽  
Significant Difference ◽  
Sagittal Parameters

Abstract Background: Spinal and pelvic sagittal plane balance is closely related to good clinical prognosis, so in the treatment of 2-level isthmic spondylolisthesis, attention should be paid not only to adequate nerve decompression, but also to the correction of lumbosacral sagittal plane parameters. The purpose of this study was to observe the clinical prognosis and sagittal parameters of patients with isthmic spondylolisthesis treated with PLIF, and to find out the risk factors leading to poor prognosis. Methods: From January 2006 to August 2018, the clinical data of patients with 2-level isthmic spondylolisthesis treated with PLIF in the Second Xiangya Hospital of Central South University were retrospectively collected. The clinical symptoms (JOA score and VAS score) and the sagittal parameters of lumbosacral segment (PI, PT, LL, L4-S1 SL, LDI, PI-LL, LL and L4-S1 SL) were recorded before operation, immediately after operation and at the last follow-up. According to the improvement rate of JOA score, the patients were divided into two subgroups, poor(P) group and good(G) group. The parameters within and between the two subgroups were compared. Meanwhile, Pearson correlation analysis was conducted between sagittal parameters and JOA score improvement rate.Results: A total of 52 patients were enrolled in this study, the average age was (59.96 ±9.11) years, and the mean follow-up time was (31.88 ±8.37) months. Group G (n = 37) and group P (n = 15). In terms of clinical symptom improvement and sagittal plane parameters, except PI, the other parameters of the patients were improved compared with those before operation, and the difference was statistically significant. In the intra-group comparison, except PI, other indexes in group G were significantly improved, while in group P, there was no significant difference in PI, LL, L4-S1 SL, LDI, PI-LL before and after operation. In the comparison between groups, there was no significant difference in baseline data between group G and group P; postoperative VAS score(back pain) in group G was lower than that in group P, but there was no significant difference in VAS score( leg pain); in terms of JOA score and JOA score improvement rate, group G was significantly better; △L4-S1 SL ,L4-S1 SL and LDI were larger in group G, and the proportion of patients with normal LDI was higher than that in group P. Pearson correlation analysis showed that postoperative △L4-S1 SL, LDI and L4-S1 SL were positively correlated with JOA improvement rate. 2 patients with failed internal fixation occurred in group P, and the postoperative LDI was less than 50%. Conclusion: PLIF is an effective method for the treatment of 2-level isthmic spondylolisthesis. ΔL4-S1 SL, L4-S1 SL and good LDI may be important sagittal parameters affecting the clinical prognosis of L4 and L5 isthmus spondylolisthesis.

scholarly journals 77 Comparison between Swiss Ball Exercise and Sling Exercise on Lumbar Stability and Postural Stability in Patients with Non-Specific Chronic Low Back Pain: A Pilot Study

2019 ◽  
Vol 48 (Supplement_4) ◽  
pp. iv18-iv27
Author(s):  
Apinkarn Jaroenlarp ◽  
Pitsinee Fuengjit ◽  
Jirapat Sukeeyuti ◽  
Parichart Sophap ◽  
Chadarat Chirasaengthong
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Chronic Low Back Pain ◽  
Functional Disability ◽  
Sagittal Plane ◽  
Postural Sway ◽  
Neuromuscular Control ◽  
Coronal Plane ◽  
Low Back ◽  
Significant Difference

Abstract Objective This study was to comparison of level of lumbar stability and postural sway in sagittal plane and coronal plane between exercise with ball and sling in the patients with non-specific chronic low back pain (NCLBP). Methodology Twenty participants with NCLBP aged 20 to 55 years were randomly divided into exercise with ball group (BG) and exercise with sling group (SG). Both groups performed 8 exercise sessions; two times per week for four weeks. The visual analog scale (VAS), modified oswestry disability questionnaire (MODQ), modified isometric stability test (MIST) were used to measure at baseline, week 2 and week 4 after exercise. Moreover, the sway area and sway velocity were evaluated at before and after training. Both group performed exercise 15 repetitions per set for 3 sets with 1-minute resting between set. A repeated two-way ANOVA was used to analyze the difference variables between both groups. Results The results showed significant difference between pre and post treatment of pain intensity, functional disability, MIST and postural sway in both groups (p&lt;.001). When compared between both groups, the reduction in all parameters for the BG group was significantly higher than the SG group (p&lt;.05). Moreover, the findings represented that the postural sway in both sagittal and coronal plane showed no significant difference between both groups after complete treatment. Conclusion The core stabilization exercise with ball and with sling can provided reduction of pain and functional disability. Moreover, the BG group is more effective for decreasing of pain, disability and improving of lumbar stability may described by greater perturbation of the ball. During perform exercise on ball bring to unstable and increasing of neuromuscular control. These results can applied to clinical practice for choosing the appropriate exercise program in the patients with NCLBP.

Functional Role of the Superior Articular Facets of the Atlas in the Enhancement of Craniovertebral Junction Stability

2010 ◽  
Author(s):  
Richard C. Hallgren ◽  
Erik Cattrysse ◽  
Jesse M. Zrull
Keyword(s):  
Cervical Spine ◽  
Sagittal Plane ◽  
Craniovertebral Junction ◽  
Transverse Plane ◽  
Automobile Accidents ◽  
Automobile Accident ◽  
Significant Difference ◽  
Posterior Translation ◽  
Developmental Variations

Whiplash distortions of the cervical spine, occurring during the retraction phase of a rear end automobile accident, are known to cause posterior translation of the head relative to the chest and shoulders [1,2]. This anteroposterior shear produces sagittal plane rotation of the cervical spine which results in relative flexion between the occiput and the atlas (Fig. 1). This study demonstrates that there is a significant difference between the average angles of the anterior aspects and the posterior aspects of the superior facets of the atlas with respect to a horizontal (transverse) plane at P<0.01. We hypothesize that developmental variations in some individuals will allow excessive posterior translation of the head during rear end automobile accidents, and that this excessive motion may increase the risk of sustaining a whiplash-type injury for some individuals.

scholarly journals Does hypersensitive teeth show pulp inflammation?

2019 ◽  
Vol 67 ◽  
Author(s):  
Daniele Paraguassú FAGUNDES-DE-SOUZA ◽  
Marcelo Henrique NAPIMOGA ◽  
Andresa Borges SOARES ◽  
Vera Cavalcanti ARAÚJO ◽  
Cecilia Pedroso TURSSI
Keyword(s):  
Inflammatory Response ◽  
Dental Pulp ◽  
Mineral Water ◽  
Sagittal Plane ◽  
Soft Drink ◽  
Histological Evaluation ◽  
Dentin Hypersensitivity ◽  
Pulp Tissue ◽  
Pulp Inflammation ◽  
Significant Difference

ABSTRACT Objective: This study investigated the presence of inflammatory response in the dental pulp of rats showing hypersensitive dentin, induced by erosive episodes. Methods: Sixteen Wistar rats were fed with commercial sucrose-free pellet diet for 12 hours; whereas the food was removed during the remainder of the day, and the animals received mineral water or a lemon-based sucrose-free soft drink, according to the group to which they belonged. Eight animals consumed the soft drink to induce hypersensitivity, while the other 8 animals received mineral water (control). After six weeks, the animals were euthanized, the mandible was removed and subjected to a median incision in the sagittal plane, to obtain right and left hemimandibles. The slides stained with hematoxylin-eosin were analyzed using light microscopy. Results: Histological evaluation of the control and experimental groups revealed no inflammatory process in the pulp tissue, and the presence of inflammatory cells, such as lymphocytes, plasma cells, eosinophils and macrophages, was not observed. In addition, there was no edema or dilated and congested blood vessels. The Mann-Whitney test showed no significant difference (p = 1.000) between the experimental and the control groups. Conclusion: In the animal model used, dentin hypersensitivity does not trigger dental pulp inflammatory response.

scholarly journals Walking in Natural Environments as Geriatrician’s Recommendation for Fall Prevention: Preliminary Outcomes from the “Passiata Day” Model

2020 ◽  
Vol 12 (7) ◽  
pp. 2684 ◽  
Author(s):  
Giuseppe Battaglia ◽  
Valerio Giustino ◽  
Giuseppe Messina ◽  
Mariangela Faraone ◽  
Jessica Brusa ◽  
...  
Keyword(s):  
Older People ◽  
Exercise Intervention ◽  
Sagittal Plane ◽  
Frontal Plane ◽  
Natural Environments ◽  
Body Balance ◽  
Walking Program ◽  
Significant Difference ◽  
Outdoor Walking ◽  
Risk Of Falls

Background: The Geriatric Unit of the University of Palermo developed the “Passiata Day” model, a green exercise intervention consisting of a one-hour walk, once/week, in a city park. The purpose of this study was to assess body balance in older people who walked regularly compared to sedentary people. Methods: 106 older people (75 women and 31 men; mean age: 72.3 ± 8.2 years) without fall history were invited to participate voluntarily in this natural environment walking program. After six months, both the participants who had taken part regularly in the walk (i.e., the physical activity group (PAG; n = 72; 54 women and 18 men; mean age: 70.7 ± 7.2 years)), and who had not accepted to be included in the outdoor walking program (i.e., the sedentary group (SG; n = 34; 21 women and 13 men; mean age: 75.5 ± 9.4 years)), performed a stabilometric test with open eyes (OE) and with closed eyes (CE). Results: Our preliminary results showed significant differences between groups on the ellipse sway area both in the OE (p < 0.05) and in CE condition (p < 0.01). Moreover, we found a significant difference on sway along the frontal plane both in the OE (p < 0.05) and in the CE condition (p < 0.01), and on sway along the sagittal plane for the test with CE (p < 0.01). Conclusion: Based on our preliminary findings, we suggest that walking regularly in an outdoor setting could lead to a greater body balance in older people and could be recommended by geriatricians for preventing the risk of falls. The next step will be to investigate the effect of an experimental outdoor walking program structured in terms of intensity, frequency and volume.

Relationship between chest mobility and angle of spinal curvateres in the saggital plane

2019 ◽  
Vol 29 (87) ◽  
pp. 39-46
Author(s):  
Marta Bibro ◽  
Łucja Laskowska ◽  
Anita Ziemba ◽  
Agnieszka Jankowicz-Szymańska
Keyword(s):  
Body Weight ◽  
Lumbar Lordosis ◽  
Weight Status ◽  
Sagittal Plane ◽  
Three Dimensional ◽  
Respiratory Muscles ◽  
Body Weight Status ◽  
Significant Difference ◽  
Excessive Body Weight ◽  
Normal Body Weight

Aim: Faulty body postures is a significant problem affecting the reduction of quality of health and life in every age group. Currently, more and more attention is paid to the importance of respiratory muscles, and above all the diaphragm in stabilizing posture. The aim of the study was to determine the relationship between selected features of the position of the torso and chest mobility. Basic procedures: 33 young adults were included in the study. Body weight and height were measured, BMI was calculated and body weight status was determined. The chest circumferences at rest, maximum inspiration and maximum exhalation at three heights was measured. Three-dimensional torso settings were evaluated using the Zebris Pointer Ulrtrasound System. The collected data were subjected to statistical analysis. Results: The majority of examined women had normal body weight, while excessive body weight occurred in nearly 1/3 of men. The most significant difference in the position of the torso was the greater depth of lumbar lordosis in women. A significant correlation was found between the lumbar spine position and the chest circumferences. The results indicate a decrease in chest mobility along with an increase in the depth of lumbar lordosis. Conclusions: Respiratory kinesitherapy should be an important part of the process of correction of spinal shape in sagittal plane.

Sign in / Sign up

Export Citation Format

Share Document