Guest Columnist and runner, Raghul Trekker gives you nutritional advice before the most celebrated marathon in India, the Tata Mumbai Marathon.
If you are a marathoner and if you live in India, you wouldn’t want to miss the Tata Mumbai Marathon. It is the most celebrated marathon considering the huge local support from the Government, Police, general public, etc. Also, you get to see some lightening elite runners (probably overtaking you at some point of your run). Many runners peak their training towards this race and target their personal best at this grand stage. The environment makes it possible too.
If it is your target race, you definitely need a proper strategy on your pre-race meal for which, we have to look into some calorie calculation. In general, the calorie expended by a person while running can be approximately measured using body weight and distance run. For sample calculation, I am considering a 65 kg runner
Body weight * distance run ≈ energy expended in calorie
65 kg * 42 km ≈ 2730 calorie
Almost everyone concentrates on their race week carb loading but surprisingly forgets their pre-race meal. It is more important than your race week nutrition. This amount of calorie, on an empty stomach, would all be supplied from the energy reserve which is usually somewhere near 2000 calorie which will be expended when you run a little over 30 km. Does it ring any bell? Yes, I am talking about the wall of a marathon. This is why people bonk between 30 & 35 km mark.
A pre-race meal of 500 calorie is a good way to start a race day with this being 90 min before the race start if it is solid food or 15-30 min before race start if it is liquid food.
Now that we have understood some numbers related to how much is expended and how much is to be consumed, it is time to understand the breakage of consumption in terms of fat and carbs. For a marathon, we can expect finish times of 120 min to 360 min range. With this we can recommend the following (the below calculations are based on heart rate zones)
- Fast runners 120-150 min: a high carb pre-race meal with a shot of caffeine. The carbs being a mixture of high GI and low GI.
- Intermediate runners 150-200 min: a high carb pre-race meal & little bit of fat. The carbs being low GI.
- Slow runners 200 min or above: a carb & fat mixed pre-race meal. The carbs being low GI.
Fast runners 120-150 min
Cereals with almond milk, grapes, banana, white bread with jam and other high GI foods. The high GI carbs will provide fast release of energy. A shot of caffeine from coffee, caffeinated salt capsules, caffeinated energy drinks, etc.
Intermediate runners 150-200 min
Fruits like apple, pears, oranges, yoghurt, grainy bread and other low GI foods in combination with cereals, grapes, banana and other high GI foods. The low GI carbs will provide slow release of energy for a prolonged period.
Slow runners 200 min & above
Grainy bread with peanut butter, cheese, avocado, nuts like almonds, pistachio, cashew, groundnuts with almond milk, millets and other fat & carb mixed meal. The fat will supply energy for the slow runners because they will use more of fat while running at low HR zones than the faster runners. So, this fact cannot be overlooked.
Consider the above points and put yourself into one of the categories to suit an apt pre-race meal for your upcoming marathon. Since the race starts at 0540 hrs, I would consume a semi solid pre-race meal at around 0445 hrs after a long 8 hour sleep.
With a little bit of smartness, you can do a lot better
All the best for your PB.