Department of Physiology and Pharmacology, Fluminense Federal University, Niterói, Brazil; National Institute for Science & Technology - INCT (In)activity & Exercise, CNPq - Niterói (RJ), Rio de Janeiro, Brazil.
Department of Physical Education and Sports, Fluminense Federal University, Niterói, Brazil.
Respir Physiol Neurobiol. 2020 Oct;281:103505. doi: 10.1016/j.resp.2020.103505. Epub 2020 Jul 22.
It was hypothesized that induced inspiratory muscles effort, by an acute inspiratory resistance load (IRL) use, increases the postural sway and the neuromuscular activity of postural muscles in older adults. Fifteen older women breathed spontaneously, controlled (15 cycles/minute), and with acute IRL (15 cycles/minute and target load of 30 % of maximal inspiratory pressure) in random order. The breathing tasks were performed in an orthostatic position (eyes closed) during one minute on a baropodometer plate to acquire center-of-pressure (COP) oscillations and with electromyography (EMG) recording. The root mean square (RMS) of EMG was calculated. COP oscillations were higher with IRL use than spontaneous and controlled breathing tasks, but not between spontaneous and controlled conditions. EMG activity of Tibialis anterior and Soleus muscles were higher with IRL use in comparison to spontaneous and controlled breathing conditions. In conclusion, IRL use influenced the postural control through increased postural sway and neuromuscular compensation of the lower limbs in older women.
研究假设，通过使用急性吸气阻力负荷（IRL）来诱发吸气肌用力，会增加老年人的姿势摆动和姿势肌肉的神经肌肉活动。15 名老年女性以随机顺序分别进行自发性、控制性（15 次/分钟）和急性 IRL（15 次/分钟和最大吸气压力的 30%目标负荷）呼吸。在一个姿势计平板上，以直立位（闭眼）进行一分钟的呼吸任务，以获取中心压力（COP）的摆动，并进行肌电图（EMG）记录。计算了 EMG 的均方根（RMS）。与自发性和控制性呼吸任务相比，IRL 时的 COP 摆动更高，但与自发性和控制性条件之间没有差异。与自发性和控制性呼吸条件相比，IRL 时胫骨前肌和比目鱼肌的 EMG 活动更高。总之，IRL 的使用通过增加姿势摆动和下肢的神经肌肉代偿来影响老年人的姿势控制。
