Knee extensor force production and discomfort during neuromuscular electrical stimulation of quadriceps with and without gluteal muscle co-stimulation,European Journal of Applied Physiology

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Knee extensor force production and discomfort during neuromuscular electrical stimulation of quadriceps with and without gluteal muscle co-stimulation
European Journal of Applied Physiology ( IF 2.8 ) Pub Date : 2022-04-15 , DOI: 10.1007/s00421-022-04949-9
J Flodin _{1,

2} , C Mikkelsen _{3,

4} , P W Ackermann _{1,

2}

Affiliation

Purpose

To investigate whether Neuromuscular Electrical Stimulation (NMES) simultaneously applied on the quadriceps (Q) and gluteal (G) muscles, as compared to single Q-stimulation alters the knee extensor force production and discomfort.

Methods

A total of 11 healthy participants (6 females), with normal weight and age between 19 and 54 years were included. The unilateral, isometric maximal voluntary contraction (MVC) was assessed for each participant in an isokinetic dynamometer (Biodex, system 3). NMES was, in a randomized order, applied only on the Q-muscle and on the Q- and G-muscles (QG) simultaneously. NMES-intensity was increased stepwise until the maximal tolerable level was reached regarding discomfort, graded according to the visual analogue scale (VAS). VAS and the % of MVC produced by NMES, were registered for each level, expressed as median (inter-quartile range).

Results

The maximum tolerated NMES-intensity applied on Q compared to QG resulted in equally high discomfort, 8.0 (6.0–9.0) vs 8.0 (6.3–9.0), and in equivalent knee extensor force production, 36.7 (29.9–47.5) and 36.2 (28.9–49.3), respectively, in % of MVC. At 20% of MVC, NMES applied on Q compared to QG resulted in equal acceptable discomfort, 3.0 (2.0–4.5) vs 3.0 (3–5.5), and comparable intensity levels, 41.5 (38.0–45.8) vs 43.5 (37.0–48.8), respectively.

Conclusions

Simultaneous QG-NMES, as compared to single Q-NMES, does not seem to affect the knee extensor force production or discomfort. Q-NMES, without voluntary muscle contraction, can with an acceptable level of discomfort result in at least 20% of MVC.

中文翻译：

有和没有臀肌共刺激的股四头肌神经肌肉电刺激过程中膝伸肌力的产生和不适

目的

研究与单次 Q 刺激相比，神经肌肉电刺激 (NMES) 是否同时应用于股四头肌 (Q) 和臀肌 (G) 会改变膝关节伸肌力的产生和不适。

方法

共纳入 11 名健康参与者（6 名女性），体重正常，年龄在 19 至 54 岁之间。在等速测力计（Biodex，系统 3）中评估每个参与者的单侧等长最大自主收缩 (MVC)。NMES 以随机顺序仅应用于 Q 肌肉以及同时应用于 Q 和 G 肌肉 (QG)。NMES 强度逐步增加，直到达到关于不适的最大可耐受水平，根据视觉模拟量表 (VAS) 分级。VAS 和 NMES 产生的 MVC 百分比针对每个级别进行了登记，表示为中位数（四分位间距）。

结果

与 QG 相比，应用于 Q 的最大耐受 NMES 强度导致同样高的不适感，8.0 (6.0-9.0) vs 8.0 (6.3-9.0)，并且在等效的膝关节伸肌力产生中，36.7 (29.9-47.5) 和 36.2 (28.9) –49.3)，分别以 MVC 的百分比表示。在 MVC 的 20% 时，与 QG 相比，应用于 Q 的 NMES 导致相同的可接受的不适感，3.0 (2.0-4.5) vs 3.0 (3-5.5)，并且强度水平相当，41.5 (38.0-45.8) vs 43.5 (37.0-48.8) ），分别。