To determine if the intention to perform an exercise at speed leads to beneficial alterations in kinematic and kinetic components of the movement in people with post-stroke hemiplegia.

Comparative study.

Subacute metropolitan rehabilitation hospital.

Convenience sample of patients admitted as an inpatient or outpatient with a diagnosis of stroke with lower limb weakness, functional ambulation category score ≥3, and ability to walk ≥14metres.

Participants performed a single leg squat exercise on their paretic and nonparetic legs on a leg sled under three conditions: 1) self-selected speed (SS), 2) fast speed (FS), 3) jump squat (JS). Measures of displacement, flight time, peak concentric velocity, and muscle excitation (via electromyography) were compared between legs and conditions.

Eleven participants (age: 56 ± 17 years; median time since stroke onset: 3.3 [IQR 3,41] months) were tested. All participants achieved a jump during the JS, as measured by displacement and flight time respectively, on both their paretic (0.25 ± 0.16 m and 0.42 ± 0.18 s) and nonparetic (0.49 ± 0.36 m and 0.73 ± 0.28 s) legs; however it was significantly lower on the non-paretic leg (p < 0.05). Peak concentric velocity increased concordantly with intended movement speed (JS-FS paretic: 0.96 m/s, non-paretic: 0.54 m/s; FS-SS paretic 0.69 m/s, nonparetic 0.38 m/s; JS-SS paretic 1.66 m/s, non-paretic 0.92 m/s). Similarly, muscle excitation increased significantly (p < 0.05) with faster speed for the paretic and nonparetic vastus lateralis. For gastrocnemius, the only significant difference was an increase during nonparetic JS vs. SS and FS.

Speed affects the kinematic and kinetic components of the movement. Performing exercises ballistically may improve training outcomes for people post-stroke.

确定以速度进行锻炼的意图是否会导致中风后偏瘫患者的运动学和动力学成分发生有益的改变。

比较研究。

亚急性大都会康复医院。

被诊断为下肢无力、功能性行走类别评分≥3、行走能力≥14米的中风住院或门诊患者的便利样本。

参与者在三种情况下在腿雪橇上对他们的瘫痪和非瘫痪腿进行单腿深蹲练习：1）自选速度（SS），2）快速（FS），3）跳蹲（JS）。在腿和条件之间比较位移、飞行时间、峰值同心速度和肌肉兴奋（通过肌电图）的测量。

测试了 11 名参与者（年龄：56 ± 17 岁；中风发作后的中位时间：3.3 [IQR 3,41] 个月）。所有参与者在 JS 期间都实现了跳跃，分别通过位移和飞行时间测量，在他们的麻痹（0.25 ± 0.16 m 和 0.42 ± 0.18 s）和非麻痹（0.49 ± 0.36 m 和 0.73 ± 0.28 s）腿上；然而，在非麻痹腿上它显着降低（p < 0.05）。峰值同心速度与预期运动速度一致增加（JS-FS 麻痹：0.96 m/s，非麻痹：0.54 m/s；FS-SS 麻痹 0.69 m/s，非麻痹 0.38 m/s；JS-SS 麻痹 1.66 m /s，非偏瘫 0.92 m/s）。同样，肌肉兴奋显着增加（p< 0.05) 麻痹和非麻痹股外侧肌的速度更快。对于腓肠肌，唯一的显着差异是非麻痹 JS 与 SS 和 FS 期间的增加。

速度影响运动的运动学和动力学分量。进行弹道运动可以改善中风后人们的训练结果。