皮褶厚度会影响神经肌肉电刺激引起的等长膝关节伸展扭矩。
Skinfold thickness affects the isometric knee extension torque evoked by Neuromuscular Electrical Stimulation.
机构信息
Faculdade de Educação Física, Universidade de Brasília, Brasília, DF, Brazil.
Faculdade de Ciências da Saúde, Universidade de Brasília, Brasília, DF, Brazil.
出版信息
Braz J Phys Ther. 2015 Nov-Dec;19(6):466-72. doi: 10.1590/bjpt-rbf.2014.0114. Epub 2015 Sep 1.
BACKGROUND
Subcutaneous adipose tissue may influence the transmission of electrical stimuli through to the skin, thus affecting both evoked torque and comfort perception associated with neuromuscular electrical stimulation (NMES). This could seriously affect the effectiveness of NMES for either rehabilitation or sports purposes.
OBJECTIVE
To investigate the effects of skinfold thickness (SFT) on maximal NMES current intensity, NMES-evoked torque, and NMES-induced discomfort.
METHOD
First, we compared NMES current intensity, NMES-induced discomfort, and NMES-evoked torque between two subgroups of subjects with thicker (n=10; 20.7 mm) vs. thinner (n=10; 29.4 mm) SFT. Second, we correlated SFT to NMES current intensity, NMES-induced discomfort, and NMES-evoked knee extension torque in 20 healthy women. The NMES-evoked torque was normalized to the maximal voluntary contraction (MVC) torque. The discomfort induced by NMES was assessed with a visual analog scale (VAS).
RESULTS
NMES-evoked torque was 27.5% lower in subjects with thicker SFT (p=0.01) while maximal current intensity was 24.2% lower in subjects with thinner SFT (p=0.01). A positive correlation was found between current intensity and SFT (r=0.540, p=0.017). A negative correlation was found between NMES-evoked torque and SFT (r=-0.563, p=0.012). No significant correlation was observed between discomfort scores and SFT (rs=0.15, p=0.53).
CONCLUSION
These results suggest that the amount of subcutaneous adipose tissue (as reflected by skinfold thickness) affected NMES current intensity and NMES-evoked torque, but had no effect on discomfort perception. Our findings may help physical therapists to better understand the impact of SFT on NMES and to design more rational stimulation strategies.
背景
皮下脂肪组织可能会影响电流刺激穿透皮肤的程度，从而影响神经肌肉电刺激（NMES）引起的诱发扭矩和舒适度感知。这可能会严重影响 NMES 在康复或运动方面的有效性。
目的
研究皮褶厚度（SFT）对最大 NMES 电流强度、NMES 诱发扭矩和 NMES 引起不适的影响。
方法
首先，我们比较了 SFT 较厚（n=10；20.7 毫米）和较薄（n=10；29.4 毫米）的两组受试者之间的 NMES 电流强度、NMES 引起的不适和 NMES 诱发的扭矩。其次，我们在 20 名健康女性中，将 SFT 与 NMES 电流强度、NMES 引起的不适和 NMES 诱发的膝关节伸展扭矩相关联。NMES 诱发的扭矩被归一化为最大自主收缩（MVC）扭矩。NMES 引起的不适通过视觉模拟量表（VAS）进行评估。
结果
SFT 较厚的受试者 NMES 诱发的扭矩低 27.5%（p=0.01），而 SFT 较薄的受试者最大电流强度低 24.2%（p=0.01）。发现电流强度与 SFT 之间存在正相关（r=0.540，p=0.017）。发现 NMES 诱发的扭矩与 SFT 之间存在负相关（r=-0.563，p=0.012）。未发现不适评分与 SFT 之间存在显著相关性（rs=0.15，p=0.53）。
结论
这些结果表明，皮下脂肪组织的量（如皮褶厚度所反映）会影响 NMES 电流强度和 NMES 诱发的扭矩，但对不适感知没有影响。我们的发现可能有助于物理治疗师更好地理解 SFT 对 NMES 的影响，并设计更合理的刺激策略。
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