A Comparison of Two Multisegment Foot Models in High-and Low-Arched Athletes

2013 ◽  
Vol 103 (2) ◽  
pp. 99-105 ◽  
Author(s):  
Douglas W. Powell ◽  
D.S. Blaise Williams ◽  
Robert J. Butler
Keyword(s):  
Repeated Measures ◽  
Female Athletes ◽  
Traumatic Injury ◽  
Three Dimensional ◽  
Frontal Plane ◽  
Plane Motion ◽  
Ground Reaction Forces ◽  
Time To Peak ◽  
Foot Model ◽  
Reaction Forces

Background: Malalignment and dysfunction of the foot have been associated with an increased propensity for overuse and traumatic injury in athletes. Several multisegment foot models have been developed to investigate motions in the foot. However, it remains unknown whether the kinematics measured by different multisegment foot models are equivocal. The purpose of the present study is to examine the efficacy of two multisegment foot models in tracking aberrant foot function. Methods: Ten high-arched and ten low-arched female athletes walked and ran while ground reaction forces and three-dimensional kinematics were tracked using the Leardini and Oxford multisegment foot models. Ground reaction forces and joint angles were calculated with Visual 3D (C-Motion Inc, Germantown, MD). Repeated-measures analyses of variance were used to analyze peak eversion, time to peak eversion, and eversion excursions. Results: The Leardini model was more sensitive to differences in peak eversion angles than the Oxford model. However, the Oxford model detected differences in eversion excursion values that the Leardini model did not detect. Conclusions: Although both models found differences in frontal plane motion between high- and low-arched athletes, the Leardini multisegment foot model is suggested to be more appropriate as it directly tracks frontal plane midfoot motion during dynamic motion. (J Am Podiatr Med Assoc 103(2): 99–105, 2013)

Joint Stabilizing Response to Expected and Unexpected Tilts

2005 ◽  
Vol 26 (10) ◽  
pp. 870-880 ◽  
Author(s):  
Gaspar Morey-Klapsing ◽  
Adamantios Arampatzis ◽  
Gert-Peter Brueggeman
Keyword(s):  
Muscle Activation ◽  
Reaction Force ◽  
Three Dimensional ◽  
Ground Reaction Forces ◽  
Testing Methods ◽  
Emg Signal ◽  
Foot Motion ◽  
Foot Model ◽  
Reaction Forces ◽  
Electromyographic Signals

Background: The results found in the literature regarding functional ankle joint stabilization are controversial possibly because of the testing methods used. Methods: The responses of 22 subjects to unexpected and expected sudden inversions of the foot were compared for all subjects together, as well as grouped by their self-perceived stability. A three-dimensional foot model was used to describe ankle and foot motion. Electromyographic signals of six muscles of the lower limb as well as the horizontal ground reaction forces were recorded. Results: Whereas unexpected and expected trials did not show significant differences ( p > 0.05) in kinematics, higher activation and horizontal force integrals were found for the unexpected trials. In addition, no differences in electromyographic or ground reaction force parameters were found between stable and unstable ankles; however, the kinematics revealed higher amplitudes and velocities for the stable group. Conclusions: The awareness of the instant of tilt enhances stabilization in that the same motion is achieved with a lower muscle activation. Evidence suggests that this is triggered at supraspinal levels. We found that timing of the EMG signal is not as relevant to stabilization as the amplitude (which has often been disregarded in the literature).

scholarly journals Increasing Step Rate Affects Rearfoot Kinematics and Ground Reaction Forces during Running

Biology ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 8
Author(s):  
Kathryn A. Farina ◽  
Michael E. Hahn
Keyword(s):  
Frontal Plane ◽  
Plane Motion ◽  
Lower Limbs ◽  
Ground Reaction Forces ◽  
Tibial Rotation ◽  
Step Rate ◽  
Position Data ◽  
Reaction Forces ◽  
Limb Kinematics ◽  
Lower Limb Kinematics

Relatively high frontal and transverse plane motion in the lower limbs during running have been thought to play a role in the development of some running-related injuries (RRIs). Increasing step rate has been shown to significantly alter lower limb kinematics and kinetics during running. The purpose of this study was to evaluate the effects of increasing step rate on rearfoot kinematics, and to confirm how ground reaction forces (GRFs) are adjusted with increased step rate. Twenty runners ran on a force instrumented treadmill while marker position data were collected under three conditions. Participants ran at their preferred pace and step rate, then +5% and +10% of their preferred step rate while being cued by a metronome for three minutes each. Sagittal and frontal plane angles for the rearfoot segment, tibial rotation, and GRFs were calculated during the stance phase of running. Significant decreases were observed in sagittal and frontal plane rearfoot angles, tibial rotation, vertical GRF, and anteroposterior GRF with increased step rate compared with the preferred step rate. Increasing step rate significantly decreased peak sagittal and frontal plane rearfoot and tibial rotation angles. These findings may have implications for some RRIs and gait retraining.

scholarly journals Influences of Athletic Footwear on Ground Reaction Forces During A Sidestep Cutting Maneuver on Artificial Turf

2018 ◽  
Vol 6 (2) ◽  
pp. 30
Author(s):  
Jacob R. Gdovin ◽  
Charles C. Williams ◽  
Samuel J. Wilson ◽  
Lauren A. Luginsland ◽  
Charles R. Allen ◽  
...  
Keyword(s):  
Repeated Measures ◽  
Time Frame ◽  
American Football ◽  
Ground Reaction Forces ◽  
Artificial Turf ◽  
Force Development ◽  
Recreational Athletes ◽  
Time To Peak ◽  
Running Shoes ◽  
Reaction Forces

Background: Recreational athletes can select their desired footwear based on personal preferences of shoe properties such as comfort and weight. Commonly worn running shoes and cleated footwear with similar stud geometry and distribution are worn when performing sport-specific tasks such as a side-step cutting maneuver (SCM) in soccer and American football (hereafter, referred to as football). The effects of such footwear on injury mechanics have been documented with less being known regarding their effect on performance. Objective: The purpose of this study was to examine performance differences including peak ground reaction forces (pGRF), time-to-peak ground reaction forces (tpGRF) and the rate of force development (RFD) between football cleats (FB), soccer cleats (SOC), and traditional running sneakers (RUN) during the braking and propulsive phases of a SCM. Methodology: Eleven recreationally active males who participated in football and/or soccer-related activities at the time of testing completed the study. A 1 x 3 [1 Condition (SCM) x 3 Footwear (RUN, FB, SOC)] repeated measures ANOVA was utilized to analyze the aforementioned variables. Results: There were no significant differences (p > 0.05) between footwear conditions when comparing pGRF, tpGRF, or RFD in either the braking or propulsive phases. Conclusion: The results suggest that the studded and non-studded footwear allowed athletes to generate similar forces over a given time frame when performing a SCM.

scholarly journals Ground Reaction Forces of Dressage Horses Performing the Piaffe

Animals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 436 ◽  
Author(s):  
Hilary Mary Clayton ◽  
Sarah Jane Hobbs
Keyword(s):  
Coefficient Of Variation ◽  
Three Dimensional ◽  
Individual Variability ◽  
The Other ◽  
Ground Reaction Forces ◽  
High Coefficient ◽  
Reaction Forces

The piaffe is an artificial, diagonally coordinated movement performed in the highest levels of dressage competition. The ground reaction forces (GRFs) of horses performing the piaffe do not appear to have been reported. Therefore, the objective of this study was to describe three-dimensional GRFs in ridden dressage horses performing the piaffe. In-ground force plates were used to capture fore and hindlimb GRF data from seven well-trained dressage horses. Peak vertical GRF was significantly higher in forelimbs than in the hindlimbs (7.39 ± 0.99 N/kg vs. 6.41 ± 0.64 N/kg; p < 0.001) with vertical impulse showing a trend toward higher forelimb values. Peak longitudinal forces were small with no difference in the magnitude of braking or propulsive forces between fore and hindlimbs. Peak transverse forces were similar in magnitude to longitudinal forces and were mostly directed medially in the hindlimbs. Both the intra- and inter-individual variability of longitudinal and transverse GRFs were high (coefficient of variation 25–68%). Compared with the other diagonal gaits of dressage horses, the vertical GRF somewhat shifted toward the hindlimbs. The high step-to-step variability of the horizontal GRF components is thought to reflect the challenge of balancing on one diagonal pair of limbs with no forward momentum.

Analysis of Foot Kinematics with Unstable Sole Structure Using Oxford Foot Model

2017 ◽  
Vol 34 ◽  
pp. 1-9 ◽  
Author(s):  
Ying Yue Zhang ◽  
Gusztáv Fekete ◽  
Justin Fernandez ◽  
Yao Dong Gu
Keyword(s):  
Sagittal Plane ◽  
Plantar Flexion ◽  
Three Dimensional ◽  
Frontal Plane ◽  
The Body ◽  
Control Effect ◽  
Foot Kinematics ◽  
Foot Model ◽  
Contrast Group ◽  
Oxford Foot Model

To determine the influence of the unstable sole structure on foot kinematics and provide theoretical basis for further application.12 healthy female subjects walked through a 10-meter experimental channel with normal speed wearing experimental shoes and control shoes respectively at the gait laboratory. Differences between the groups in triplanar motion of the forefoot, rearfoot and hallux during walking were evaluated using a three-dimensional motion analysis system incorporating with Oxford Foot Model (OFM). Compare to contrast group, participants wearing experimental shoes demonstrated greater peak forefoot dorsiflexion, forefoot supination and longer halluces plantar flexion time in support phase. Additionally, participants with unstable sole structure also demonstrated smaller peak forefoot plantarflexion, rearfoot dorsiflexion and range of joint motion in sagittal plane and frontal plane.. The difference mainly appeared in sagittal and frontal plane. With a stimulation of unstable, it may lead to the reinforcement of different flexion between middle and two ends of the foot model. The greater forefoot supination is infered that the unstable element structure may affect the forefoot motion on the frontal plane and has a control effect to strephexopodia people. The stimulation also will reflexes reduce the range of rearfoot motion in sagittal and frontal planes to control the gravity center of the body and keep a steady state in the process of walking.

Temporal Influences of Functional Knee Bracing on Torque Production of the Lower Extremity

2006 ◽  
Vol 15 (3) ◽  
pp. 215-227
Author(s):  
Brian Campbell ◽  
James Yaggie ◽  
Daniel Cipriani
Keyword(s):  
Lower Extremity ◽  
Outcome Measures ◽  
Repeated Measures ◽  
Exercise Intervention ◽  
Three Dimensional ◽  
Exercise Program ◽  
Joint Moments ◽  
Repeated Measures Design ◽  
Reaction Forces ◽  
Vertical Ground Reaction Forces

Context:Functional knee braces (FKB) are used prophylactically and in rehabilitation to aide in the functional stability of the knee.Objective:To determine if alterations in select lower extremity moments persist throughout a one hour period in healthy individuals.Design:2X5 repeated measures design.Setting:Biomechanics Laboratory.Subjects:Twenty subjects (14 male and 6 female, mean age 26.5±7 yrs; height 172.4±13 cm; weight 78.6±9 kg), separated into braced (B) and no brace (NB) groups.Intervention:A one-hour exercise program divided into three 20 minute increments.Main Outcome Measures:Synchronized three-dimensional kinematic and kinetic data were collected at 20-minute increments to assess the effect of the FKB on select lower extremity moments and vertical ground reaction forces.Results:Increase in hip moment and a decrease in knee moment were noted immediately after brace application and appeared to persist throughout a one hour bout of exercise.Conclusions:The FKB and the exercise intervention caused decreases in knee joint moments and increases in hip joint moments.

Lower Extremity Kinematics of a Single-Leg Squat with an Orthotic in Male and Female Collegiate Athletes

2014 ◽  
Vol 30 (3) ◽  
pp. 361-365 ◽  
Author(s):  
Michael F. Joseph ◽  
Kristin L. Holsing ◽  
David Tiberio
Keyword(s):  
Lower Extremity ◽  
Repeated Measures ◽  
Female Athletes ◽  
Knee Injuries ◽  
Collegiate Athletes ◽  
Frontal Plane ◽  
Male And Female ◽  
Ankle Eversion ◽  
Female Collegiate Athletes ◽  
Single Leg Squat

Kinematic differences have been linked to the gender discrepancies seen in knee injuries. A medially posted orthotic decreases frontal and transverse plane motions in the lower extremity during ambulation, squatting and landing. This study investigated the effect of a medial post on amount and timing of lower extremity motions during a single-leg squat in male and female athletes. We hypothesized there would be differences in these kinematic variables dependent upon sex and post conditions. Twenty male and female athletes performed single-leg squats with and without a five degree full-length medial post. Maximum joint angles were analyzed using a two-way, repeated-measures analysis of variance to determine if the differences created by post condition were statistically significant, whether there were gender differences, or interactions. Differences in maximum motion values and the time at which they occurred were found between men and women at the hip, knee and ankle. The post decreased all frontal plane measures in both sexes and resulted in earlier attainment of maximum ankle eversion and delayed maximum knee valgus. A medially posted orthotic may be beneficial not only in limiting motion, but in affecting the time in which stressful motions occur.

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