Leg stiffness when getting up

    • [PDF File]Leg stiffness during phases of countermovement and take-off in ... - CQ

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      Leg stiffness during phases of countermovement and take-off in vertical jump 115 height. The kinematic data were registered by a BTS ... Prior to the examination, each subject warmed up for 10 minutes (continuous shuttle run). The purpose of this activity was to stimulate and warm up the mus-cles in order to make the best possible jump. Reflec-

    • [PDF File]Fatigue, Vertical Leg Stiffness, and Stiffness Control Strategies in ...

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      The preferred landing leg served as the test limb for all muscle activity and kinematic data. We determined the pre-ferred landing leg by having subjects perform a single-leg landing from a 30-cm-high box. The preferred landing leg was defined as the self-selected lower extremity limb on which the subject chose to land in 2 of 3 trials.

    • [PDF File]Effects of Split Style Olympic Weightlifting Training on Leg Stiffness ...

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      2.4. Leg Stiffness . Leg stiffness tests were performed based on the protocol applied in a validity and reliability study [13]. Optojump Next ® (Microgate, Bolzano, Italy) Stiffness protocol was applied. Two trials with 2-min rest was applied. The mean contact and flight times from all jumps and participants’ body mass, obtained from the ...

    • Design of a Tunable Stiffness Composite Leg for Dynamic Locomotion

      the leg stiffness to the leg swing frequency can minimize the amount of motor work that must be inserted during each stance phase. Recent work by [5] suggests that tunable leg stiffness can be used to improve robot speed and stability. These simulation studies demonstrated that tuning leg stiffness alone in response to

    • [PDF File]Aging Does Not Cause Stiffness: Stiffness Causes Aging - Jon Burras

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      Stiffness does not have to harbor in your body. There are many healing therapies that begin to open up and release the tight and restrictive patterns that have settled into the musculature and connective tissues of the body. These healing modalities might include (but are not limited to) such techniques as Swedish massage, Thai massage,

    • LEG- ANDJOINT STIFFNESSIN MALE ELITE HIGH JUMP: THE INFLUENCE OF ...

      captured with a force plate.It was found that a different leg and joint stiffness during take-off enables nearly the samejumping height. For example, a typical power jumper with a leg stiffness of 543.6 N m-1 kg-1 reached 2.13 m, while a typical speed jumper with a leg stiffness of1133.5 N m-1kg-1 reached a comparable height of 2.12 m ...

    • [PDF File]ACUTE EFFECTS OF STRETCHING ON LEG AND VERTICAL STIFFNESS DURING ...

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      7 on leg stiffness, concluding that SS did not significantly affect leg stiffness. 8 Based on the previously reported links between stiffness and performance and the 9 influence that stretching may have on stiffness, if a specific warm-up protocol greater 10 influences stiffness, it could positively or negatively influence performance. While

    • Leg stiffness and electromyography of knee extensors/flexors

      Leg length (L) was defined as the distance from the lateral malleolus to the hip joint when the knee was flexed at 0°. Leg displacement (Δx) was computed as the differ-ence between the leg length and the vertical distance from the lateral malleolus to the hip joint. This value was obtained by (1) where L1 was upper-leg length, L2 was lower ...

    • THE INTERRELATIONSHIP OF JOINT STIFFNESS IN DROP JUMP UNDER DIFFERENT ...

      stiffness although hip joint has no relationship to leg stiffness. Table 1: Kinetic and kinematicparameters in drop jumpFigure 1(Left):Leg stiffness, peak groundreaction force and the change in leg length shortening in the different conditions. Figure 2 (Right):Relationships between leg stiffness and hip, knee and ankle joint stiffness. 980

    • EFFECT OF LEG STIFFNESS DURING REBOUND JUMP ON SPRINT RUNNING ...

      After warming-up, participants performed SP and RJ at least twice. Participants were recorded in the sagittal plane with a high-speed video camera (EX-F1, 300 fps; Casio, Tokyo, ... Leg stiffness was calculated using a spring-mass model, which consist of CG and ball of the foot. It was also calculated as the ratio of mean ground reaction force ...

    • Leg Stiffness, Joint Stiffness, and Running-Related Injury - SAGE Journals

      Relative injury rate as a function of knee stiffness displayed a weak and nonsignificant U-shaped curve (P ¼ .187-.661); ankle and leg stiffness displayed no discernable associations with relative injury rate (leg stiffness, P ¼ .215-.605; ankle stiffness, P ¼ .419-.712).

    • [PDF File]Leg Stiffness Adaptation for Running on Unknown Terrains

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      appropriate leg stiffness to preserve system dynamics fol-lowing a surface compliance perturbation. Furthermore, we show that by adapting the robot's leg stiffness, a nominal gait can be maintained without any variation of actuation control for changes in ground stiffness of up to three orders of magnitude.

    • Leg Stiffness and Expertise in Men Jumping

      leg pri-marily depends on ankle stiffness (12), and changes as a function of gender (15). During the drop jump, k leg appears to be sensitive to jumping instructions, and is scaled to contact time (3). The dynamics of k leg in one-leg vertical jumps (such as in high jumping) is still unknown. Only one study has inves-tigated the contribution of k

    • LEG- ANDJOINT STIFFNESSIN MALE ELITE HIGH JUMP: THE INFLUENCE OF ...

      captured with a force plate.It was found that a different leg and joint stiffness during take-off enables nearly the samejumping height. For example, a typical power jumper with a leg stiffness of 543.6 N m-1 kg-1 reached 2.13 m, while a typical speed jumper with a leg stiffness of1133.5 N m-1kg-1 reached a comparable height of 2.12 m ...

    • [PDF File]Running with a load increases leg stiffness - Department of Orthopaedic ...

      https://info.5y1.org/leg-stiffness-when-getting-up_1_9d49db.html

      Dimensionless leg stiffness increased when running with load (p¼0.001, Table 1 ). Leg stiffness increased because the peak vertical ground reaction force increased ( po0.001), and the change in stance phase leg length decreased ( p¼0.025). Post-hoc analyses revealed that leg stiffness increased between running with no load and running

    • Design of a Tunable Stiffness Composite Leg for Dynamic Locomotion

      the leg stiffness to the leg swing frequency can minimize the amount of motor work that must be inserted during each stance phase. Recent work by [5] suggests that tunable leg stiffness can ... (BiMASC) uses an antagonistic set-up of two non-linear fiber-glass springs to store and return energy [12]. A complex system

    • [PDF File]The stiff syndrome - Journal of Neurology, Neurosurgery, and Psychiatry

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      JournalofNeurology, Neurosurgery, andPsychiatry 1997;62:31-37 Thestiffleg syndrome PBrown,J CRothwell, CDMarsden Abstract Four patients had a chronic progressive disorder beginning in middle age and involving stiffness andpainful spasms of the lower limbs. Spasms were sponta- neous, reflex, and induced by voluntary movement. Patients had rigidity and abnormal postures of one or both legs.

    • [PDF File]OPTIMIZING LEGGED LOCOMOTION USING TUNABLE LEG STIFFNESS

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      The following figure shows the set up of our tunable leg stiffness control module: Figure 4: Picture of the whole circuit setup . 7 In the above figure, the left part is the body sub-module and the right part is the leg sub-module. The small green boards at the bottom are the infrared communication units. The

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