PDF(Pubmed)
Abstract：
The present study aimed to investigate the effect of the timing of the last meal, \"Suhoor\", on diurnal variation in cognitive performance during Ramadan intermittent fasting (RIF). In a randomized order, 26 adolescent female athletes (aged 15.9 ± 0.9 y) were tested in three sessions at 7:00 a.m., 12:00 p.m., and 5:00 p.m. across four different conditions: the 10 days preceding Ramadan (PR); the final 12 days of Ramadan (RO): two different conditions: Early Suhoor (SEarly), and Late Suhoor (SLate); and, ultimately, the 10 days immediately after Ramadan (AR) with an in-between recovery period of ≥24 h. During each test session, the oral temperature (OT), simple reaction time test (SRT), choice reaction time test (CRT), attention test (ATT), and mental rotation test (MRT) were evaluated. The Pittsburgh Sleep Quality Index (PSQI) and daily diary intake were assessed across the three periods. Compared to PR, the sleep parameters assessed by the PSQI were significantly lower during the RO and AR periods. However, neither total dietary intake nor OT showed any changes due to RIF. Compared to PR, the afternoon performances of SRT, CRT, ATT, and MRT significantly declined under both the SEarly and SLate conditions. Notably, midday performance decreased only during SLate, while morning performance remained unaffected in both conditions. Additionally, compared to SEarly, these performances were better during SLate in the afternoon and at midday. In summary, nutrient intake timing had a significant effect on the diurnal fluctuations in cognitive functions during Ramadan fasting, particularly around noon and in the afternoon. Our results illustrate the benefits of a late last meal (Suhoor) in preserving optimal morning cognitive abilities and preventing any impairment during the fasted state at midday or in the afternoon, which could affect overall athletic performance.
摘要：
本研究旨在调查最后一餐时间的影响，\"Suhoor\",斋月间歇性禁食（RIF）期间认知表现的昼夜变化。按照随机顺序，26名青少年女运动员(年龄15.9±0.9岁)于上午7:00分三次接受测试,12:00p.m.,下午5:00在四个不同的条件下：斋月（PR）前10天；斋月（RO）的最后12天：两个不同的条件：早期苏霍尔（SEARY），和晚期苏胡尔(SLate)；以及，最终,斋月（AR）后的10天，中间恢复期≥24小时。在每次测试期间，口腔温度（OT），简单反应时间测试(SRT)，选择反应时间测试（CRT），注意测试(ATT),和精神旋转测试（MRT）进行评估。在三个时期内评估匹兹堡睡眠质量指数（PSQI）和每日日记摄入量。与PR相比，在RO和AR期间,PSQI评估的睡眠参数显著降低.然而,由于RIF，总饮食摄入量和OT均未显示任何变化。与PR相比，SRT下午的表演，CRT,ATT,在SEARL和SLate条件下，MRT显着下降。值得注意的是,中午表现仅在SLate期间下降，而在这两种情况下，早上的表现都不受影响。此外,与Searly相比,这些表演在下午和中午的SLate期间表现更好。总之,营养摄入时间对斋月期间认知功能的昼夜波动有显著影响，尤其是中午和下午。我们的结果说明了最后一餐（Suhoor）在保持最佳的早晨认知能力和防止中午或下午禁食状态期间的任何损害的好处，这可能会影响整体运动表现。
