The Premier League, La Liga, and the Champions League do not pause for Ramadan. Thousands of professional Muslim footballers, cyclists, and martial artists fast from pre-dawn to sunset while completing their full training and competition schedule.
This is not an edge case in global sport. Surveys suggest 60–90% of Muslim professional athletes observe Ramadan fasting in some form. The applied science for how to do this without sacrificing performance or health has developed substantially over the past decade.
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Ramadan fasting is physiologically distinct from conventional intermittent fasting. The no-fluid restriction during daylight hours is the most critical difference from 16:8 or time-restricted eating protocols. In summer months at northern latitudes, the fast can extend to 18–20 hours, with daytime temperatures increasing dehydration risk substantially.
Shephard and Wilson (2013) published a comprehensive review of 35 Ramadan studies across sports. Their meta-analysis found that body weight declined 0.5–2.0kg during Ramadan, predominantly reflecting water and glycogen mass. Aerobic capacity (VO2max) showed negligible change during Ramadan when training volume was maintained. Short-duration explosive performance was the most affected metric: sprint times, jump height, and peak power output declined 2–5% in the final hours before iftar (the evening meal that breaks the fast), when dehydration and glycogen depletion are maximal.
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The suhoor (pre-dawn meal) is the most consequential nutritional intervention available to fasting athletes. Leiper et al. (2008), studying Tunisian athletes, identified that athletes who consumed a high-carbohydrate suhoor — timed as close to the start of the fast as possible (Fajr prayer, typically 75–90 minutes before dawn) — showed significantly better afternoon performance and lower dehydration markers than those who woke earlier and ate 3–4 hours before dawn.
The ideal suhoor prioritises: slow-digesting carbohydrates (oats, basmati rice, whole grain bread) to extend blood glucose availability; a high-protein component (40–50g) to support MPS throughout the fast and attenuate muscle protein breakdown; and maximum fluid loading including sodium to delay thirst onset during the day. The glycogen window from suhoor lasts approximately 6–8 hours of rest; in training sessions timed to the late afternoon, athletes will be 8–12 hours post-suhoor and substantially glycogen-depleted.
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Training timing is the primary management lever. Three evidence-based windows emerge:
Pre-suhoor: Training immediately before the pre-dawn meal works well for aerobic sessions at moderate intensity. Muscle glycogen from the previous night's iftar is available; the suhoor follows immediately to start recovery. Sleep compression is the cost.
Post-iftar: The 1–3 hours after breaking the fast allow moderate-to-high-intensity training with adequate hydration and glycogen access. Ramadan schedules typically shift athlete training to this window. The sleep trade-off is milder — athletes can complete training by midnight and achieve 4–5 hours before suhoor.
Late afternoon pre-iftar: Training 60–90 minutes before iftar minimises performance loss (dehydration is tolerable when the rehydration end-point is close) and maximises the post-workout anabolic window by immediately following with iftar, providing a full protein-carbohydrate recovery meal.
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Al-Attar et al. (2021) studied 168 Saudi professional footballers over two consecutive Ramadan seasons. Teams that implemented structured Ramadan training plans — including shifted training times, individualised suhoor guidance, and explicit sleep management protocols — showed no decline in match performance metrics compared to pre-Ramadan baselines. Teams without structured plans showed a 4.7% decline in distance covered in the second half of matches by week 3 of Ramadan.
Sleep architecture is a significant and often under-addressed challenge. Nocturnal activity for iftar, prayers, and suhoor routinely reduces total sleep time by 1.5–2 hours during Ramadan. Strategic napping (15–20 minutes post-zuhr prayer) partially compensates, particularly for cognitive recovery.
Muslim athletes managing their Ramadan eating window can use the fasting calculator at winsport.uk/tools/nutrition/intermittent-fasting-calculator to structure their suhoor and iftar timing around training sessions, optimising both religious observance and physiological performance.
Coaches and practitioners: have you adapted training programmes for Ramadan? What's been the most effective change you've made?