Division of Physiotherapy, Department of Health Professions, Bern University of Applied Sciences, Bern, Switzerland; Faculty of Physical Education and Physiotherapy, Vrije Universiteit Brussel, Brussels, Belgium.
Division of Physiotherapy, Department of Health Professions, Bern University of Applied Sciences, Bern, Switzerland.
Ann Phys Rehabil Med. 2020 Nov;63(6):495-499. doi: 10.1016/j.rehab.2019.09.013. Epub 2019 Nov 13.
High-impact activities are often related to urine leakage in women, so deeper insight into continence mechanisms of pelvic floor muscles (PFMs) while running is needed. Therefore, simultaneous information about the intensity of PFM muscle activity and fibre recruitment behavior at each time point of the gait cycle can help in understanding PFM activity patterns.
We aimed to analyse spectral changes of the pre- and post-initial contact phase during running at 3 different speeds and to compare women with stress urinary continence (SUI) to those without SUI by using a wavelet approach.
PFM electromyography (EMG) was recorded during 7, 11 and 15km/h treadmill running and analysed with Morse wavelets. The relative distribution of power was extracted during 6 time intervals of 30ms, from 30ms before to 150ms after initial contact.
We included 28 women without SUI (mean [SD] age 38.9 [10.3] years) and 21 with SUI (mean age 46.1 [9.9] years). The groups did not differ in power spectra for each time interval. However, we found significantly less EMG intensity in the lower frequency bands but more intensity in the higher frequency bands in the pre-initial contact phase than at post-initial contact.
Morse wavelets could be used to extract differences between pre- and post-initial contact activation behavior of PFMs during different running speeds as well as spectral changes toward high or low frequencies. This information sheds light on specific differences in involuntary reflexive activation patterns while running. Muscular preparation and adaptation a few milliseconds before initial contact could be helpful.
高强度活动通常与女性尿失禁有关，因此需要更深入地了解盆底肌（PFMs）在跑步时的控尿机制。因此，同时了解 PFMs 肌肉活动的强度和纤维募集行为在步态周期的每个时间点的信息，可以帮助理解 PFMs 活动模式。
我们旨在分析跑步时前初始接触和初始接触后阶段的频谱变化，并通过小波方法比较有和无压力性尿失禁（SUI）的女性。
在 7、11 和 15km/h 的跑步机跑步过程中记录 PFMs 肌电图（EMG），并使用 Morse 小波进行分析。从初始接触前 30ms 到后 150ms，提取 6 个 30ms 时间间隔的相对功率分布。
我们纳入了 28 名无 SUI 的女性（平均[标准差]年龄 38.9[10.3]岁）和 21 名有 SUI 的女性（平均年龄 46.1[9.9]岁）。两组在每个时间间隔的功率谱上没有差异。然而，我们发现前初始接触阶段的 EMG 强度较低频带明显减少，但高频带的强度增加。
Morse 小波可用于提取不同跑步速度下 PFMs 在前初始接触和后初始接触阶段的激活行为差异以及向高低频的频谱变化。这些信息揭示了跑步时无意识反射激活模式的特定差异。在初始接触前几毫秒的肌肉准备和适应可能会有所帮助。
