Ramadan J M, Barac-Nieto M
Department of Physiology, Faculty of Medicine, Kuwait University, PO Box 24923, 13110 Safat, Kuwait.
Saudi Med J. 2000 Mar;21(3):238-44.
The aim of this study was to quantify the magnitude of the cardiovascular and respiratory changes that occur during the month of Ramadan in response to moderately heavy aerobic physical exertion.
Eighteen sedentary Kuwaiti adult males were tested under thermo-neutral conditions during a spring-like month of Ramadan and one month thereafter.
There were no significant changes in maximal exercise capacity, treadmill walking efficiency, percentage VO2 max, in body weight and composition associated with Ramadan fasting or one month after. Cardiac (heart rate) and ventilatory responses to moderately intense bouts of sub-maximal aerobic exercise (70% of VO2 max) were actually slightly (<5%) but significantly (P<0.05) reduced, while exercise systolic but not diastolic pressure increased slightly (6%) by the end of Ramadan.
Hormonal changes associated with dehydration or fasting, abstention from consumption of substances with negative inotropy and changes in circadian rhythms during Ramadan may be responsible for these mild changes in cardiorespiratory responses to exercise. Such changes had no negative effect on the physical aerobic performance of these subjects while exercising at moderately heavy intensity under thermally neutral conditions, during the month of Ramadan. Reduced ventilation during exercise may reflect a limited glycolytic capacity by the end of Ramadan.
本研究旨在量化斋月期间因适度剧烈的有氧体育锻炼而发生的心血管和呼吸变化的程度。
在类似春季的斋月期间以及之后的一个月里，对18名久坐不动的科威特成年男性在热中性条件下进行测试。
与斋月禁食期间或之后一个月相关的最大运动能力、跑步机行走效率、最大摄氧量百分比、体重和身体成分均无显著变化。对中等强度次最大有氧运动（最大摄氧量的70%）的心脏（心率）和通气反应实际上略有降低（<5%），但具有显著性（P<0.05），而到斋月结束时，运动收缩压略有升高（6%），舒张压未升高。
与脱水或禁食相关的激素变化、避免摄入具有负性肌力作用的物质以及斋月期间昼夜节律的变化，可能是导致运动心肺反应出现这些轻微变化的原因。在斋月期间，在热中性条件下进行适度剧烈运动时，这些变化对这些受试者的有氧体能表现没有负面影响。运动期间通气量的减少可能反映出斋月结束时糖酵解能力有限。
