Effects of Ramadan fasting on physical performance and metabolic, hormonal, and inflammatory parameters in middle-distance runners
Effects of Ramadan fasting on physical performance and metabolic, hormonal, and inflammatory parameters in middle-distance runners
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DOI：
10.1139/h09-014
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发表时间：
2009-08-01
影响因子：
3.4
通讯作者：
Gomez-Merino, Danielle
中科院分区：
文献类型：
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作者：
Chennaoui, Mounir;Desgorces, Francois;Gomez-Merino, Danielle
斋月禁食(RF)与睡眠习惯的改变和嗜睡的增加有关，这可能会影响运动员的身体表现，并可能导致代谢、激素和炎症障碍。对8名中长跑运动员(25.0+/-1.3岁)在RF前5天(第5天)、RF第7天和第21天进行最大有氧速度(MAV)测试。同一天，采集唾液样本，在MAV测试前后测定皮质醇和睾酮浓度。分别于射血前(P1)、射血结束时(P2)、射血后1周(P3)采血。测定血浆白细胞介素6(IL-6)水平，它是嗜睡和能量供应的中介。我们还评估了代谢和荷尔蒙参数、情绪状态以及营养和睡眠状况的变化。射频治疗期间，平均体质量和体脂无统计学变化。与第5天相比，第7天和第21天的MAV值下降(p<；0.05)，而睾酮/皮质醇比值变化不明显。夜间睡眠时间和能量摄入量在第21天低于射频前(第0/P1天)(p<；0.05)。在RF结束时(第31天)，心境状态问卷上的疲劳分数增加(p<；0.001)。与P1组相比，P2组IL-6水平升高(1.19+/-0.25vs.0.51+0.13pg.mL(-1)；p<；0.05)，褪黑素水平降低(p<；0.05)，肾上腺素和去甲肾上腺素升高(p<；0.01和p<；0.001)。射频后7d，所有参数均恢复至射频前水平。总而言之，RF伴随着显著的代谢、激素和炎症变化。在射频过程中，睡眠障碍、能量缺乏和疲劳可能会降低穆斯林运动员的体能表现。对于穆斯林运动员来说，减少工作量和(或)白天小睡可能是抵消射频效应的适当策略。
The Ramadan fasting (RF) period is associated with changes in sleep habits and increased sleepiness, which may affect physical performance in athletes, and may induce metabolic, hormonal, and inflammatory disturbances. In 8 middle-distance athletes (25.0 +/- 1.3 years), a maximal aerobic velocity (MAV) test was performed 5 days before RF (day -5), and on days 7 and 21 of RF. The same days, saliva samples were collected to determine cortisol and testosterone concentrations before and after the MAV test. Blood samples were collected before RF (P1), at the end of RF (P2), and 1 week post RF (P3). Plasma levels of interleukin (IL)-6, a mediator of sleepiness and energy availability, were determined. We also evaluated changes in metabolic and hormonal parameters, mood state, and nutritional and sleep profiles. During RF, mean body mass and body fat did not statistically change. Compared with day -5, MAV values decreased at days 7 and 21 (p < 0.05, respectively), while testosterone/cortisol ratio values did not change significantly. Nocturnal sleep time and energy intake were lower at day 21 than before RF (day 0/P1) (p < 0.05). At the end of RF (day 31), the fatigue score on the Profile of Mood States questionnaire was increased (p < 0.001). For P2 vs. P1, IL-6 was increased (1.19 +/- 0.25 vs. 0.51 +/- 0.13 pg.mL(-1); p < 0.05), melatonin levels were decreased (p < 0.05), and adrenalin and noradrenalin were increased (p < 0.01 and p < 0.001, respectively). At 7 days post RF, all parameters recovered to pre-RF values. In conclusion, RF is accompanied by significant metabolic, hormonal, and inflammatory changes. Sleep disturbances, energy deficiency, and fatigue during RF may decrease physical performance in Muslim athletes who maintain training. Reduction of work load and (or) daytime napping may represent adequate strategies to counteract RF effects for Muslim athletes.