Zaheer Sumbul, Moiz Jamal Ali, Shareef Mohammad Yaqoob, Hussain Ejaz
Center for Physiotherapy and Rehabilitation Sciences, Jamia Millia Islamia, Central University, New Delhi, India.
Faculty of Dentistry, Jamia Millia Islamia, Central University, New Delhi, India.
Asian J Sports Med. 2014 Sep;5(3):e23044. doi: 10.5812/asjsm.23044. Epub 2014 Sep 14.
Delayed onset muscle soreness (DOMS) occurs following unaccustomed or intense bouts of exercise. Previous research has demonstrated that that preconditioning with low load exercise or heat relieves muscle soreness. However, actively warming up the muscles with exercise may be an effective alternative.
This study compared preconditioning effect of light load eccentric exercise and heat using microwave diathermy on markers of muscle damage in collegiate males.
Thirty six sedentary collegiate males were randomly assigned into two experimental groups: 10% Eccentric exercise group (10% ECC group) and Microwave diathermy group (MWD group). Both the groups performed 30 repetitions of maximal eccentric exercise (Max-ECC) of the elbow flexors. The 10% ECC group performed light load eccentric exercise (10% ECC), five sets, six repetitions using a dumbbell set at 10% of maximal voluntary isometric contraction strength (MVC), 2 days prior to Max-ECC. The MWD group received heat using microwave diathermy (150 watts, 20 minutes) one day prior to Max-ECC. Changes in MVC, range of motion (ROM), upper arm circumference, soreness, were assessed before and 24-72 hours after whereas serum creatine kinase activity and lactate dehydrogenase (LDH) activity up to 48 hours following the Max-ECC were compared between groups by a mixed model ANOVA.
No significant difference (P > 0.05) were found between the groups for changes in all variables post Max-ECC, except for LDH activity showing significant interaction effect (P = 0.04).
Preconditioning with light load eccentric exercise and heat using microwave diathermy treatment did not differ in their effects on muscle damage markers after Max-ECC. However, with time their effects on LDH activity were found to be different.
延迟性肌肉酸痛（DOMS）发生在不习惯的或高强度的运动之后。先前的研究表明，低负荷运动或热预处理可减轻肌肉酸痛。然而，通过运动积极地热身肌肉可能是一种有效的替代方法。
本研究比较了轻负荷离心运动和微波透热疗法加热对大学男性肌肉损伤标志物的预处理效果。
36名久坐不动的大学男性被随机分为两个实验组：10%离心运动组（10%ECC组）和微波透热疗法组（MWD组）。两组均进行30次最大离心运动（Max-ECC）的肘屈肌运动。10%ECC组在Max-ECC前两天进行轻负荷离心运动（10%ECC），五组，每组六次，使用设定为最大自主等长收缩力量（MVC）10%的哑铃。MWD组在Max-ECC前一天接受微波透热疗法加热（150瓦，20分钟）。在Max-ECC前和后24 - 72小时评估MVC、运动范围（ROM）、上臂围、酸痛的变化，而通过混合模型方差分析比较两组在Max-ECC后48小时内血清肌酸激酶活性和乳酸脱氢酶（LDH）活性。
Max-ECC后，除LDH活性显示出显著的交互作用效应（P = 0.04）外，两组所有变量的变化均无显著差异（P > 0.05）。
轻负荷离心运动和微波透热疗法加热预处理在Max-ECC后对肌肉损伤标志物的影响没有差异。然而，随着时间推移，发现它们对LDH活性的影响有所不同。
