The effects of load on system and lower-body joint kinetics during jump squats

Rhythmic behavior in nonlinear systems can be described as limit cycles or attractors. System perturbations may result in shifts between multiple attractors. We investigated individual cycle-to-cycle leg movement kinematics of three prewalking skilled infant bouncers (10.6 ±0.91 months) during four different spring frequencies (0.9, 1.15, 1.27 and 1.56 Hz). A novel visual analysis phase-plane methodology was introduced to analyze the lower body joint kinematics. It was found that as infants’ bounce frequency increased to match the natural frequency of the system, their joint ranges of motion decreased and lower extremity dynamics shifted from forced to simple harmonic motion. All infants produced highly synchronized and coordinated movements, as supported by moderate to high inter- and intralimb correlations. This study extends from previous work (Habib Perez et al., 2015) by focusing on the lower extremity kinematic movements, joint coordination and the occurrence of different movement patterns for individual bounce cycles over four spring conditions.

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Biomechanical Validation of Upper-Body and Lower-Body Joint Movements of Kinect Motion Capture Data for Rehabilitation Treatments

2012 Fourth International Conference on Intelligent Networking and Collaborative Systems ◽

10.1109/incos.2012.66 ◽

2012 ◽

Cited By ~ 118

Author(s):

Adso Fern'ndez-Baena ◽

Antonio Susin ◽

Xavier Lligadas

Keyword(s):

Motion Capture ◽

Upper Body ◽

Motion Capture Data ◽

Lower Body ◽

Body Joint

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A feasibility study of ballet education using measurement and analysis on partial features of still scenes

International Journal of Distributed Sensor Networks ◽

10.1177/1550147716681794 ◽

2016 ◽

Vol 12 (12) ◽

pp. 155014771668179

Author(s):

So-Hyun Park ◽

Gwang-Soo Hong ◽

Sun-Woo Park ◽

Aziz Nasridinov ◽

In-Ja Park ◽

...

Keyword(s):

Feasibility Study ◽

Education System ◽

Estimation Algorithm ◽

Point Estimation ◽

Ballet Dancer ◽

Lower Body ◽

Education Systems ◽

Joint Point ◽

Measurement And Analysis ◽

Body Joint

There have been a number of dance and ballet education systems using different multimedia devices. One of the well-known multimedia devices is Kinect which uses multiple built-in sensors. We focus on Kinect-based dance and ballet education systems. Existing systems that use Kinect cannot properly recognize the turnout movement. We propose the use of a lower body joint point estimation algorithm and a closest foot points estimation algorithm that can efficiently perform image localization for recognition of basic ballet movements. In addition, in order to evaluate correct ballet movements, we propose a method that extracts partial features from still scenes and performs measurements for knee and foot positions. The proposed method is the first ballet education system that properly measures movements of a ballet dancer.

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The effects of various backpack loads on lower body joint torques

Journal of Biomechanics ◽

10.1016/0021-9290(93)90573-w ◽

1993 ◽

Vol 26 (3) ◽

pp. 354 ◽

Cited By ~ 1

Author(s):

Ki-Hoon Han ◽

Everett Harman ◽

Peter Frykman ◽

Michael Johnson ◽

Franklin Russell ◽

...

Keyword(s):

Lower Body ◽

Joint Torques ◽

Body Joint

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The Effects of Compression Garments on Stability and Lower Limb Kinematics During a Forward Lunge

Journal of Human Kinetics ◽

10.2478/hukin-2019-0074 ◽

2020 ◽

Vol 71 (1) ◽

pp. 59-68

Author(s):

Ioannis Angelakos ◽

Chris Mills ◽

Joseph O’Halloran

Keyword(s):

Injury Risk ◽

Frontal Plane ◽

Lower Body ◽

Camera System ◽

Compression Garments ◽

Ankle Inversion ◽

Limb Kinematics ◽

Control Light ◽

Lower Limb Kinematics ◽

Body Joint

AbstractCompression garments have been used to minimise injury risk, through improvements in stability and joint positioning; yet, it is unclear whether there is an optimal length or tightness of these garments that may maximise observed benefits. This study measured the effect of three different garment types, at two different tightness levels, on lower extremity stability and alignment during a forward lunge movement. Sixteen healthy adults (7 female, 9 male; 24.3 ± 2.9 years) were recruited as participants. Stability of the lead foot, as well as lower body joint kinematics, were recorded using an Oqus 12-camera system, surrounding participants as they executed three forward lunges onto a Matscan pressure mat under seven compression conditions (Control, Light/Heavy Calf, Light/Heavy Socks, Light/Heavy Leggings). Mean minimum time-to-boundary (mmTtB) (derived from centre of pressure measures) and frontal plane kinematics (lateral pelvic tilt, knee valgus, ankle inversion/eversion) were used to assess the effect of garment tightness and length on lunge stability and joint alignment, respectively. A significant effect of tightness on mmTtB was observed (F(1,105) = 8.192; p = .005, η2 = .072), with Heavy garments eliciting longer mmTtB compared to their corresponding Light (-.18 ± .06 s; p = .015) or Control (-.28 ± .09 s; p = .007) conditions. No significant effects of garment tightness or length on lower body kinematics were evident. The results of this study suggest stability during a forward lunge is improved through the use of tight-fitted compression garments.

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