粘弹性腰椎组织的累积蠕变响应与作息时间的关系

IF 2 4区 医学 Q3 NEUROSCIENCES Journal of Electromyography and Kinesiology Pub Date : 2024-06-18 DOI:10.1016/j.jelekin.2024.102916
Sang Hyeon Kang , Gary A. Mirka
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引用次数: 0

摘要

我们探讨了压力-恢复时间表对腰部组织累积蠕变反应的影响。12 名参与者进行了 48 分钟的训练,其中包括 12 分钟的躯干完全屈曲和 36 分钟的直立站立。试验采用了两种压力恢复(工作-休息)时间表:a)躯干完全屈曲 3 分钟,然后直立站立 12 分钟(3:12);b)躯干完全屈曲 1 分钟,然后直立站立 4 分钟(1:4)。收集了腰椎运动学数据和竖脊肌的肌电图活动。通过考虑完全屈曲时腰部屈曲角度峰值的变化和 48 分钟方案后腰部伸肌屈曲-放松(EMG-关闭)角度的变化,探讨了累积性蠕变变形。完全屈曲时腰部屈曲角度随时间变化的结果显示,两种工作-休息计划都有明显的蠕动反应,但 3:12 计划中的累积蠕动反应(Δ3.5°)明显大于 1:4 计划中的累积蠕动反应(Δ1.6°)。同样,在 3:12 计划中,EMG-关闭腰屈角度的变化也明显大于 1:4 计划(分别为 Δ2.5° 与 -Δ0.2°)。这些结果表明,在较短的周期时间内,被动腰部组织能更快地恢复其产生力量的能力。
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Cumulative creep response of viscoelastic lumbar tissue as a function of work-rest schedule

We explore the effect of stress-recovery schedule on the cumulative creep response of lumbar tissues. Twelve participants performed a 48-minute protocol that consisted of 12 min of full trunk flexion and 36 min of upright standing. Two stress-recovery (work-rest) schedules were considered: a) three minutes of full trunk flexion followed by twelve minutes of upright standing (3:12), and b) one minute of full trunk flexion followed by four minutes of upright standing (1:4). Lumbar kinematics and EMG activity of erector spinae muscles were collected. Cumulative creep deformation was explored by considering the changes in peak lumbar flexion angles during full flexion and changes in the angles of flexion-relaxation (EMG-off) of the lumbar extensor musculature after the 48-minute protocol. The results of time-dependent lumbar flexion angle during full flexion revealed a noticeable creep response in both work-rest schedules, but the cumulative creep response was significantly greater in the 3:12 schedule (Δ3.5°) than in the 1:4 schedule (Δ1.6°). Similarly, the change in the EMG-off lumbar flexion angle in the 3:12 schedule was significantly greater than in the 1:4 schedule (Δ2.5° vs −Δ0.2°, respectively). These results indicate that the passive lumbar tissues recover their force producing capability more rapidly with shorter cycle times.

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来源期刊
CiteScore
4.70
自引率
8.00%
发文量
70
审稿时长
74 days
期刊介绍: Journal of Electromyography & Kinesiology is the primary source for outstanding original articles on the study of human movement from muscle contraction via its motor units and sensory system to integrated motion through mechanical and electrical detection techniques. As the official publication of the International Society of Electrophysiology and Kinesiology, the journal is dedicated to publishing the best work in all areas of electromyography and kinesiology, including: control of movement, muscle fatigue, muscle and nerve properties, joint biomechanics and electrical stimulation. Applications in rehabilitation, sports & exercise, motion analysis, ergonomics, alternative & complimentary medicine, measures of human performance and technical articles on electromyographic signal processing are welcome.
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