scholarly journals Altered Movement Biomechanics in Chronic Ankle Instability, Coper, and Control Groups: Energy Absorption and Distribution Implications

2019 ◽  
Vol 54 (6) ◽  
pp. 708-717 ◽  
Author(s):  
Hyunsoo Kim ◽  
S. Jun Son ◽  
Matthew K. Seeley ◽  
J. Ty Hopkins
Keyword(s):  
Body Weight ◽  
Lower Extremity ◽  
Energy Absorption ◽  
Ankle Sprain ◽  
Ankle Instability ◽  
Control Groups ◽  
Joint Power ◽  
Jump Landing ◽  
Movement Strategies ◽  
And Control

Context Patients with chronic ankle instability (CAI) exhibit deficits in neuromuscular control, resulting in altered movement strategies. However, no researchers have examined neuromuscular adaptations to dynamic movement strategies during multiplanar landing and cutting among patients with CAI, individuals who are ankle-sprain copers, and control participants. Objective To investigate lower extremity joint power, stiffness, and ground reaction force (GRF) during a jump-landing and cutting task among CAI, coper, and control groups. Design Cross-sectional study. Setting Laboratory. Patients or Other Participants A total of 22 patients with CAI (age = 22.7 ± 2.0 years, height = 174.6 ± 10.4 cm, mass = 73.4 ± 12.1 kg), 22 ankle-sprain copers (age = 22.1 ± 2.1 years, height = 173.8 ± 8.2 cm, mass = 72.6 ± 12.3 kg), and 22 healthy control participants (age = 22.5 ± 3.3 years, height = 172.4 ± 13.3 cm, mass = 72.6 ± 18.7 kg). Intervention(s) Participants performed 5 successful trials of a jump-landing and cutting task. Main Outcome Measure(s) Using motion-capture cameras and a force plate, we collected lower extremity ankle-, knee-, and hip-joint power and stiffness and GRFs during the jump-landing and cutting task. Functional analyses of variance were used to evaluate between-groups differences in these dependent variables throughout the contact phase of the task. Results Compared with the coper and control groups, the CAI group displayed (1) up to 7% of body weight more posterior and 52% of body weight more vertical GRF during initial landing followed by decreased GRF during the remaining stance and 22% of body weight less medial GRF across most of stance; (2) 8.8 W/kg less eccentric and 3.2 W/kg less concentric ankle power, 6.4 W/kg more eccentric knee and 4.8 W/kg more eccentric hip power during initial landing, and 5.0 W/kg less eccentric knee and 3.9 W/kg less eccentric hip power; and (3) less ankle- and knee-joint stiffness during the landing phase. Concentric power patterns were similar to eccentric power patterns. Conclusions The CAI group demonstrated altered neuromechanics, redistributing energy absorption from the distal (ankle) to the proximal (knee and hip) joints, which coincided with decreased ankle and knee stiffness during landing. Our data suggested that although the coper and control groups showed similar landing and cutting strategies, the CAI group used altered strategies to modulate impact forces during the task.

Analysis of Differences in Static Lower Extremity Alignment among Chronic Ankle Instability, Coper, and Control Groups

2021 ◽  
Vol 19 (2) ◽  
pp. 345-357
Author(s):  
Hyung Gyu Jeon ◽  
◽  
Inje Lee ◽  
Hee Seong Jeong ◽  
Byong Hun Kim ◽  
...  
Keyword(s):  
Lower Extremity ◽  
Ankle Instability ◽  
Chronic Ankle Instability ◽  
Control Groups ◽  
Lower Extremity Alignment ◽  
And Control

Prelanding movement strategies among chronic ankle instability, coper, and control subjects

2021 ◽  
pp. 1-17
Author(s):  
Seunguk Han ◽  
Seong Jun Son ◽  
Hyunsoo Kim ◽  
Hyunwook Lee ◽  
Matthew Seeley ◽  
...  
Keyword(s):  
Ankle Instability ◽  
Chronic Ankle Instability ◽  
Control Subjects ◽  
Movement Strategies ◽  
And Control

scholarly journals Acute Effects of Midsole Bending Stiffness on Lower Extremity Biomechanics during Layup Jumps

2020 ◽  
Vol 10 (1) ◽  
pp. 397
Author(s):  
Zhiqiang Zhu ◽  
Weijie Fu ◽  
En Shao ◽  
Lu Li ◽  
Linjie Song ◽  
...  
Keyword(s):  
Lower Extremity ◽  
Ankle Joint ◽  
Jump Height ◽  
Acute Effects ◽  
Kinetic Chain ◽  
Joint Power ◽  
Joint Biomechanics ◽  
Reaction Forces ◽  
Lower Extremity Biomechanics ◽  
And Control

Purpose: This study aims to investigate the acute effects of shoe midsole stiffness on the joint biomechanics of the lower extremities during specific basketball movements. Methods: Thirty participants wearing stiff midsole shoes (SS) and control shoes (CS) performed layup jumps (LJs) while the kinematics and ground reaction forces were simultaneously collected via the Vicon motion capture system and Kistler force plates. Furthermore, the joint angles, range of motion (ROM), joint power, joint energy, and jump height were calculated. Results: No significant differences were observed between SS and CS conditions for both jump height and the metatarsophalangeal (MTP) joint biomechanics except that the minimum angular velocity of the MTP joint was significantly lower in SS the condition. However, the ROM in the ankle joint was significantly greater in the SS condition than in the CS condition (p < 0.05). Additionally, the maximum plantarflexion power, energy absorption (EA), and energy generation (EG) in the ankle joint were significantly greater in the SS condition than in the CS condition (p < 0.05). Compared with the CS condition, jump height in the SS condition did not increase. Conclusion: During a single LJ, the longitudinal midsole stiffness did not influence the jump height and MTP joint biomechanical patterns but significantly increased the maximum power, EA, and EG during the push-off phase of the ankle joint. These preliminary results indicate that wearing SS could change the ankle joint mechanical patterns by modulating the lower extremity kinetic chain, and may enhance muscle strength in the ankle.

Design and Control of a Pneumatically Actuated Lower-Extremity Orthosis

2012 ◽  
Vol 6 (4) ◽  
Author(s):  
Sai-Kit Wu ◽  
Tad Driver ◽  
Xiangrong Shen
Keyword(s):  
Lower Extremity ◽  
High Power Density ◽  
Mechanical Device ◽  
Natural Interaction ◽  
Joint Power ◽  
Power Sources ◽  
Pneumatic Actuators ◽  
Finite State ◽  
External Power ◽  
And Control

Lower-extremity orthosis is a type of wearable mechanical device that serves a wide variety of important biomedical purposes, such as gait assistance and rehabilitative training. Due primarily to the constraints associated with actuation technology, the majority of current lower-extremity orthoses are either passive or tethered to external power sources, limiting the functionality of such devices. In this paper, the authors present the research results towards a fully mobile (i.e., untethered) powered lower-limb orthosis, leveraging the high power density of pneumatic actuators for the joint power generation. The design of the orthosis is presented, with the objectives of providing full locomotive assistance in multiple common locomotive modes and generating a minimum level of restriction to the wearer's daily activities. For the control of the orthosis, a finite-state impedance-based controller is developed, which simulates an artificial impedance in order to enable the natural interaction with the wearer. Preliminary testing on a healthy subject demonstrated that the orthosis was able to provide a natural gait and a comfortable user experience in the treadmill walking experiments.

scholarly journals Hop-Stabilization Training and Landing Biomechanics in Athletes With Chronic Ankle Instability: A Randomized Controlled Trial

2019 ◽  
Vol 54 (12) ◽  
pp. 1296-1303 ◽  
Author(s):  
Mohammad Karimizadeh Ardakani ◽  
Erik A. Wikstrom ◽  
Hooman Minoonejad ◽  
Reza Rajabi ◽  
Ali Sharifnezhad
Keyword(s):  
Lower Extremity ◽  
Training Program ◽  
Ankle Instability ◽  
Control Group ◽  
Ground Reaction Forces ◽  
Basketball Players ◽  
Jump Landing ◽  
Randomized Controlled ◽  
Landing Biomechanics ◽  
Reaction Forces

Context Hopping exercises are recommended as a functional training tool to prevent lower limb injury, but their effects on lower extremity biomechanics in those with chronic ankle instability (CAI) are unclear. Objective To determine if jump-landing biomechanics change after a hop-stabilization intervention. Design Randomized controlled clinical trial. Setting Research laboratory. Patients or Other Participants Twenty-eight male collegiate basketball players with CAI were divided into 2 groups: hop-training group (age = 22.78 ± 3.09 years, mass = 82.59 ± 9.51 kg, height = 187.96 ± 7.93 cm) and control group (age = 22.57 ± 2.76 years, mass = 78.35 ± 7.02 kg, height = 185.69 ± 7.28 cm). Intervention(s) A 6-week supervised hop-stabilization training program that consisted of 18 training sessions. Main Outcome Measure(s) Lower extremity kinetics and kinematics during a jump-landing task and self-reported function were assessed before and after the 6-week training program. Results The hop-stabilization program resulted in improved self-reported function (P &lt; .05), larger sagittal-plane hip- and knee-flexion angles, and greater ankle dorsiflexion (P &lt; .05) relative to the control group. Reduced frontal-plane joint angles at the hip, knee, and ankle as well as decreased ground reaction forces and a longer time to peak ground reaction forces were observed in the hopping group compared with the control group after the intervention (P &lt; .05). Conclusions The 6-week hop-stabilization training program altered jump-landing biomechanics in male collegiate basketball players with CAI. These results may provide a potential mechanistic explanation for improvements in patient-reported outcomes and reductions in injury risk after ankle-sprain rehabilitation programs that incorporate hop-stabilization exercises.

MRI Identification of the Fibular and Talus Position in Patients with Mechanical Ankle Instability

2017 ◽  
Vol 38 (07) ◽  
pp. 546-550 ◽  
Author(s):  
Hong-Yun Li ◽  
Ru-Shou Zhou ◽  
Ying-Hui Hua ◽  
Shi-Yi Chen
Keyword(s):  
Ankle Instability ◽  
Axial Plane ◽  
Control Group ◽  
Medial Malleolus ◽  
Anatomic Variations ◽  
Mr Images ◽  
Control Groups ◽  
Significant Difference ◽  
And Control

AbstractSpecific anatomic variations of the ankle mortise may be found in people with ankle instability. The purpose was to evaluate the fibular and talus position in subjects with mechanical ankle instability (MAI). In this study, MR images of 54 patients with MAI and 51 patients from the author’s institution for reasons unrelated to ankle instability were reviewed. The position of the fibular in relation to the talus (axial malleolar index, AMI) and medial malleolus (intermalleolar index, IMI) were evaluated at the axial plane. Meanwhile, the rotation of the talus was measured and calculated using a new index, the Malleolar Talus Index (MTI), which is measured in relation to the medial malleolar. The results showed that the AMI in the MAI patients increased significantly when compared to that in the control group. However, there was no statistically significant difference in the IMI between instability and control groups. The MTI increased significantly in the MAI patients when compared to that in the control group. The conclusion was that the patients with MAI have more of an internally rotated talus than a variation of fibular position.

scholarly journals Water sprinkling as a tool for heat abatement in farmed Iberian red deer: Effects on calf growth and behaviour

PLoS ONE ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. e0249540
Author(s):  
F. J. Pérez-Barbería ◽  
I. Arroyo-González ◽  
A. J. García ◽  
M. P. Serrano ◽  
L. Gallego ◽  
...  
Keyword(s):  
Body Weight ◽  
Treatment Group ◽  
Red Deer ◽  
Control Group ◽  
Control Groups ◽  
Similar Time ◽  
Control Male ◽  
Calf Growth ◽  
Iberian Red Deer ◽  
And Control

Climatic models predict scenarios in which ambient temperature will continue increasing worldwide. Under these climatic conditions, fitness and animal welfare of many populations are expected to suffer, especially those that live in captive or semi-natural conditions, where opportunities of heat abatement are limited. We undertook an experimental design to assess the effect of heat abatement that water sprinkling might have on Iberian red deer calf growth and behaviour from birth to weaning (135 days). One group of ten mother-calf pairs lived on plots with water sprinkling (treatment) available during summer’s hottest time of the day, while the control group (nine mother-calf pairs) occupied plots with no available water sprinkling. Treatment and control groups were fed ad libitum and swapped between plots every seven days to minimise any plot effect. Body weight was monitored weekly and individual behaviour was recorded once or twice a week at mid-day. We observed that calves had showers under the sprinklers and wallowed in mud puddles. The results clearly indicated that calves of the treatment group showed a significant increase in body weight at weaning in comparison with the control group, with no differences between sexes (treatment: male = 56.5 kg, female = 50.3 kg; control: male = 50.3 kg, female = 46.5 kg). Mother weight and mother age effects were negligible on calf body weight at weaning. The heavier the mother the faster was the rate of growth of its offspring, irrespective of calf sex. The model indicated that although males grew significantly slower than female calves in the control group, males grew faster than females when exposed to the treatment. Calves of the treatment group spent less time drinking, less time in the shade, similar time eating and more time in motion than calves of the control group. There were no behavioural differences between calf sexes of treatment and control groups. The results indicate the importance of providing animals with opportunities of heat abatement in hot environments to improve animal growth and welfare in farmed Iberian red deer.

Examining the Use of Kinesiology Tape During Weight Bearing Exercises on Proprioception in Participants With Functional Ankle Instability

2021 ◽  
pp. 003151252110364
Author(s):  
Fatemeh Binaei ◽  
Rozita Hedayati ◽  
Majid Mirmohammadkhani ◽  
Cyrus Taghizadeh Delkhoush ◽  
Rasool Bagheri
Keyword(s):  
Ankle Instability ◽  
Weight Bearing ◽  
Control Groups ◽  
Functional Ankle Instability ◽  
Randomized Controlled ◽  
Partial Form ◽  
The Mean ◽  
Kinesiology Tape ◽  
And Control ◽  
Controlled Clinical Study

The aim of this study was to examine the effect of tape worn during weight bearing exercises on proprioception (i.e., ankle angle repositioning error) in participants with functional ankle instability. We employed a randomized, controlled clinical study in a laboratory setting, with 56 participants with functional ankle instability. Participants were randomly assigned to three groups: (a) weight bearing exercises without tape (n = 18), (b) weight bearing exercises with tape (n = 19) and controls not engaged in weight bearing exercises (n = 19). Weight bearing exercises included six weeks of bilateral squats in partial form with up to 45 degrees of knee flexion, and unilateral partial squats with full heel raise, and with full toe raise. In the taped condition, participants wore tape for six weeks with up to three tape replacements per week. Proprioception was measured as ankle repositioning error. Results showed that the mean angle repositioning error among participants in the active weight bearing groups was decreased by the taping intervention, relative to the control group’s performance ( p = 0.042). There were no significant differences between weight bearing exercise groups and control groups. The addition of kinesiology tape in weight bearing exercises can improve proprioception in active conditions.

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