Effect of far-infrared basketball arm guard on muscle fatigue under different pressures
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摘要: 当前运动护臂研究大多聚焦压力这一单因素对缓解肌肉疲劳的作用，较少与远红外技术结合探讨。本研究采用石墨烯锦纶复合纤维与锦纶纱线编织成运动护臂，制备出远红外纤维含量（质量分数，全文同）分别为0%、25%、50%、75%的样品，并在3种压力水平下测试其缓解手臂肌肉疲劳的效果。通过肌电信号均方根（RMS）、中值频率（MF）及主观疲劳评分来评估肌肉疲劳程度，结果表明，含远红外纤维的护臂能有效降低运动后肌肉疲劳，且降低效果随远红外纤维含量的增加而提升，75%纤维含量的护臂效果最佳。在远红外纤维含量相同的情况下，中等与高压力护臂能更有效地缓解肌肉疲劳，尤其在肱桡肌和桡侧腕屈肌部位效果更显著，这可能与这些肌肉在运动中的发力顺序及参与度有关。Abstract: Existing researches on sports arm sleeves predominantly focus on the singular effect of compression in alleviating muscle fatigue, with limited integration of far-infrared radiation (FIR) technology investigated. In this study, sports arm sleeves were knitted using graphene-nylon composite fiber and nylon yarn, with far-infrared fiber contents (mass fraction, the same hereafter) of 0%, 25%, 50%, and 75%. Their effects on reducing muscle fatigue in the arm were evaluated under three pressure levels. Muscle fatigue was assessed using the root mean square (RMS) and median frequency (MF) of electromyographic signals, as well as subjective fatigue scores. The results indicate that FIR-integrated sleeves effectively reduce muscle fatigue after exercise, with the effect increasing as FIR fiber content rises, peaking at 75% content. At the same FIR contents, medium- and high-compression sleeves are more effective in alleviating muscle fatigue, particularly in the brachioradialis and flexor carpi radialis muscles. This may be attributed to the sequence of muscle activation and involvement degree during exercise.
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图 3 各肌肉区域RMS值随时间变化情况
Figure 3. Changes in RMS values of different muscle areas over time
图 4 各肌肉区域MF值随时间变化情况
Figure 4. Changes in MF values of different muscle areas over time
图 6 M5时段不同压力下各部位MF斜率绝对值
Figure 6. Absolute values of MF slopes at different sites under various pressures during M5 phase
表 1 试验护臂规格
Table 1. Specifications of test arm sleeves
样品编号 石墨烯锦纶复合纤维含量/% 纱线原料 1＃ 0 70D普通锦纶，70D/68F
石墨烯锦纶复合纤维，
120#乳胶丝2＃ 25 3＃ 50 4＃ 75 
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表 2 试验护臂尺寸
Table 2. Test arm sleeve sizes
尺码 1/2上臂围/cm 1/2下臂围/cm 长度/cm L 10.5 10.0 35 M 10.0 9.5 35 S 9.5 9.0 35
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表 3 受试者手臂数据范围
Table 3. Range of participants' arm data
年龄/岁 身高/cm 体质量/kg 臂长/cm 上臂围/cm 下臂围/cm 23 ± 2 178.0 ± 3.0 70 ± 5.0 35.0 ± 2.0 28.0 ± 2.0 25.0 ± 2.0
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表 4 运动护臂远红外性能测试
Table 4. FIR properties testing of sports arm sleeve
样品编号 远红外发射率/% 远红外辐射升温/℃ 是否符合标准 1# 72.1 2.40 不符合 2# 89.0 3.00 符合 3# 92.5 3.45 符合 4# 95.8 3.57 符合
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表 5 不同着装压力对MF斜率的影响
Table 5. Effect of different garment pressures on MF slope
样衣编号 M1 M2 M3 M4 M5 1L 0.637 0.446 0.215 0.104 0.035 1M 0.548 0.312 0.113 0.102 0.047* 1S 0.337 0.206 0.134 0.031* 0.329* 2L 0.533 0.318 0.176 0.048 0.031* 2M 0.429 0.131 0.050 0.312* 0.216* 2S 0.411 0.142 0.121* 0.222* 0.017* 3L 0.533 0.642 0.421 0.124* 0.248* 3M 0.415 0.348 0.227 0.102* 0.489* 3S 0.376 0.217 0.532* 0.135* 0.311* 4L 0.512 0.386 0.413 0.543* 0.212* 4M 0.367 0.231 0.434* 0.322* 0.012* 4S 0.385 0.413* 0.296* 0.131* 0.021* 注：*为P<0.05。
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表 6 不同压力下各部位MF斜率与主观疲劳指标的相关性
Table 6. Correlation between MF slope at different sites under various pressures and subjective fatigue indicators
样衣编号 肱二头肌 肱三头肌 肱桡肌 桡侧腕屈肌 L 0.289 0.329 0.386* 0.433 M 0.334 0.298 0.432** 0.406* S 0.408* 0.154* 0.375** 0.368** 注：*为P<0.05；**为P<0.01。
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