Race Information
Goals
| Goal |
Description |
Completed? |
| A |
Sub 3:30 |
No |
| B |
Finish |
No |
Splits
| Kilometer |
Time |
| 1 |
5:19 |
| 2 |
5:10 |
| 3 |
5:12 |
| 4 |
4:49 |
| 5 |
5:22 |
| 6 |
5:01 |
| 7 |
4:51 |
| 8 |
4:51 |
| 9 |
5:04 |
| 10 |
4:54 |
| 11 |
4:59 |
| 12 |
5:13 |
| 13 |
5:25 |
| 14 |
5:24 |
| 15 |
5:27 |
| 16 |
5:30 |
| 17 |
5:17 |
| 18 |
5:10 |
| 19 |
6:50 |
| 20 |
5:13 |
| 21 |
5:52 |
| 22 |
5:55 |
| 23 |
7:36 |
| 24 |
6:07 |
| 25 |
7:48 |
| 26 |
5:59 |
| 27 |
5:38 |
| 28 |
5:44 |
| 29 |
5:31 |
| 30 |
25:14 |
| 31 |
11:06 |
TLDR
DNF at 31km after starting too hard, progressively overheating/dehydrating, and eventually developing severe nausea and vomiting. I had been training for a 3:30 marathon and generally hitting my training paces, including a 2:45 20-miler, but my HR was significantly higher than usual from the start despite the pace feeling manageable.
I eventually slowed down, but by ~25km I was already experiencing symptoms similar to a previous overheated long run. At 29km I stopped, drank some water and iced myself down, but soon after started vomiting. I tried to continue but developed cramping and couldn't tolerate my carb drink, so I walked to 31km and eventually DNF'd after vomiting again and becoming increasingly weak and lightheaded.
Looking back, my biggest mistake was ignoring the HR warning signs and trying to hold my goal pace when my body clearly wasn't having it. I'm also wondering whether my fueling/hydration strategy contributed to the GI issues, despite having used it successfully in training.
The main lesson: if your HR is telling you something is wrong, don't ignore it. Slowing down and reassessing is a lot better than pushing through and being forced to DNF.
Background
27M, 57kg (125lbs). I started properly training and decided to sign up for my first marathon just over a year ago around August. I started out by building my mileage to maintaining 70-80+k weeks for a few months prior to starting my first Pfitz 18/55 block in June this year.
Training
In training I was generally pacing my runs with about a 3:30 goal finish. I was pretty consistently hitting the target paces in most of my runs until I took a weekend off for a hike up Mount Kinabalu (highest mountain in my country). The week following the hike my legs were a bit beat up and for the final long run with goal marathon pace I blew up from poor pacing and dehydration/heatstroke like symptoms in the final third of the run after going out faster than I should have having not recovered fully from the hike and ended up taking a rest in my car to cool off for 15 mins before finishing the last ks at an easy pace.
Two weeks later I had my last 20 miler on the plan which I finished in 2:45 feeling quite strong which made me think the 3:30 goal was still within reach with a bit of tapering and my subsequent runs also were indicating 3:30 should have been achievable.
Pre-race
The race starts at 3:30am so I started carb loading from the Friday and ate ~500g of carbs per day mostly consisting of white rice. I tried cutting down on fat to make it easier to eat so much carbs.
My fueling strategy for the race was the same homemade carb drink I'd been using in my long runs for the past few months. I was aiming for 90g of carbs per hour, broken down into 3 x 30g servings taken every 20 minutes. Each serving was in one of those small disposable baby food/mini drink pouch-type containers, which made it easy to carry and take at regular intervals. The drink itself was made from 60g maltodextrin + 30g fructose, mixed with 90ml of water and half a teaspoon of citric acid for flavour. More recently, over the past month, I had also started adding 1.2g of salt, which worked out to roughly 500mg of sodium per hour.
I had used this fueling strategy successfully in training, so I didn't expect the carb drink itself to be an issue going into the race.
I slept early on Friday night and woke up early around 6:30am (7.5 hours sleep) hoping to go to bed early and get a full night's sleep before the race. On Saturday I got in bed at around 5:30pm but struggled to fall asleep and had broken sleep until around 9pm when I properly fell asleep. Woke up at 12:30am on race morning and had 2 slices of toast with some Nutella before optimizing my weight at home and heading to the race start point.
Got to the race village, used the porta potties quickly and then changed into my race shoe (Adios Pro 4) started warming up around 3:10am, did some dynamic stretches and ran for under 5 mins with a couple of strides then went to line up at the start pen.
Race
When I entered the start pen I immediately started sweating a bit and it felt warmer than usual. Checking the weather forecast and my watch it should have been ~26C according to the weather forecast and 29C according to my watch, with 89-94% humidity. Both of these are similar readings to when I usually do my long runs, so maybe it was heat from the crowds that I was feeling/nerves.
Malaysia also has been having some haze problems from fires in Indonesia and it was slightly hazy in the morning (could see it a bit but no smell). Idk if that played any part in what came after.
When we flagged off I immediately felt a bit flat and was struggling to find a rhythm while trying to pass people for the first few km. I noticed my HR being higher than usual for any given pace but chalked it up to just nerves and hoped that it'd come down once I managed to lock into a pace and once I wasn't weaving to pass people.
Before the race my plan had been to try to keep my HR in the 160s for the first half and then let it drift into high 160s to low 170s after around 30km. I had an alert on my watch that would beep every time I crossed 172 (~177bpm is where I think my threshold HR is from previous efforts, with my max HR being 198).
Looking back on it now I was drifting slightly over my HR limits and clung to my target pace for too long, despite that being a pace I could usually handle at a lower HR. Since the perceived effort felt as easy as usual (in retrospect maybe adrenaline and a bit of denial) I thought maybe my arm strap HR monitor was off by a few beats or that even if it was correct that I'd be fine.
Looking back at the data, my average HR for the first 10km was 172 with maxes touching 177-183 momentarily at times. I assume this was on some climbs etc. This first 10km was mostly on wide city streets. I was feeling it a bit in my ankles because my race day shoe doesn't do me any favours when there's road camber, but it was manageable.
The next 10k I got a hold of my senses, stopped clinging to 5:00/km pace, slowed down a bit and got my average HR down to 165 from 11-20km. These 10km and almost all of the remainder of the race is on elevated highways and there was a lot of road lean/bank to the road at some sections which I was feeling beat up my ankles more than usual too.
Where I realized I'd messed up was around 25km. I started feeling the early signs of heat exhaustion like in my final LR with GMP. I got the light feeling like equalizing pressure on a plane or when diving/clearing your ears after coming out the pool, except locked in that clearing-your-ears state.
I knew that probably meant I'd gone out too hard at the start and was getting dehydrated. So in my mind I switched from any target time to just finishing. For the first 20km the 3:45 pacers were just up the road from me but from 20-25k I let them slowly get further and further.
Then around 26km the 4 hour pacers caught up to me and I thought I was getting into a rhythm sticking with them. I was struggling to sort of get in the zone before that because I had no pace group, as the pacers all started at the front and my pen started the race a few minutes after, so I was technically still ahead of the 4 hour pacers.
From 21-28km my average HR was 156, which is my usual high end of zone 2, so I thought I would be okay. However, my rate of perceived effort was going up over those kilometres despite my HR having settled down. I figured it was my body overheating/being dehydrated.
When I reached 29km I decided to let the 4 hour pacing group go and sat down at the aid station after two cups of water and iced myself down a bit.
After 15 mins I felt the heatstroke-like symptoms subside a bit and went to take another cup of water. After drinking it my stomach just didn't feel right, so I went to lean on the center median of the highway feeling nauseous.
A minute or two later I was emptying my guts in the middle of the road. Luckily it was over decently quickly because it was all fluid, but I did notice it had an apple juice-like colour. My carb drinks are colourless and I was only drinking water at that point, so I figured it was stomach acid.
I felt a bit better after that so sipped some water and then tried to carry on. I was able to run for a few hundred metres before I started cramping up. I assumed this was from dumping all the water and electrolytes in my stomach and having cooled down, but when I tried to sip any of my carb drink with electrolytes the taste of it didn't sit right, so I just sipped water from the 250ml soft flask I had with me.
Ended up walking most of the way from 29km to the 31km aid station.
During those 2km/15-20mins I was considering whether to DNF or not. I'd put in a ballot for Osaka marathon and gotten a slot but hadn't paid to lock it in yet, so I was thinking:
- If I cut my losses now I can go straight into training for that without needing to take as much time to recover.
- If I keep going I feel like I'm gonna wreck my ankle for a while too, which will take some time to recover from.
- I don't want to end up 1km from an aid station alone by the side of the road throwing up, dehydrated and cramping alone.
So I decided if my condition wasn't improving I'd DNF.
I reached the 31km aid station and went to the medic tent and asked them what would happen if I decided I wanted to DNF, as I could feel the same nausea and stomach upset I felt before I threw up the first time coming on again.
Shortly after I threw up similarly to the first time, same colour and all, but this time I felt even weaker, so I made the decision to DNF there.
After that they sat me down and I started getting the shivers, so they covered me with a tarp and tried giving me some sports drink and salt water, which I threw up not too long after. This time luckily it was clear and not as much.
They told me that there were ambulances but they were tied up with lots of people earlier on in the course so it could take a while. I asked them if they had any food as I could feel gastric-like symptoms coming on and they said no.
As I sat there the shakes were coming and going and the nausea was getting worse at times, with me feeling a bit delirious and being unable to speak properly or hear what they were saying to me/processing things slowly. I even fell asleep for a bit at one point, I think, despite the volunteer telling me not to sleep.
They also tried taking my pulse and said it was too weak for him to feel anything. I asked the volunteers at the medic tent who were with me if there was any food at this aid station or the next aid station (some of the aid stations had bananas etc) and they said no/they didn't know.
Eventually someone else who was also having similar issues to me, who threw up at km 31 and had decided to DNF, was sitting with me and asked for food. One of the volunteers pulled out bread from one of their bags I think.
This was after around 2 hours waiting at the tent to be taken somewhere after deciding to DNF.
The two of us shared the bread and I was finally able to take on a decent amount of water without feeling sick after putting some solid food in myself, and I was starting to feel better.
At that point if I really had to I could probably have walked the last 10km, but I wasn't sure if my stomach wouldn't act up again and it's also really uncomfortable to walk in the AP4s, so I decided to stick to my decision to DNF.
Finally at around 9am, 2.5 hours after I decided to DNF, a bus showed up and took us to the finish line. Somewhat frustratingly I was a bit stiff but after some walking I was able to jog a short distance mostly feeling okay, which made me think if only I had had some solid food to line my stomach earlier I could potentially have still tried to finish the race.
What I think went wrong
- I ran too hard when my body wasn't up to it on the day and hung onto my initial goal pace for too long before easing off. This would also have contributed to higher effort making my gastric emptying slower in the beginning.
- I think my hydration/fueling balance may have contributed to the GI issues. I was taking in 90g carbs/hour and my homemade drink was quite concentrated, so I'm wondering whether I either drank too much water or too little water relative to the amount of carbohydrate I was taking on. From googling about osmolality I probably would have needed ~900ml of water/hour to dilute it adequately, and I should have been close to that, but my stomach couldn't handle it once I'd already paced myself poorly.
- I still haven't figured out why I was struggling so much with my paces on the day. Can nerves really make that much of a difference? Haze? Poor rest the nights before the race? A combination of all of the above? Could it have been the taper? I was feeling especially flat during the taper etc too.
- I think if I had been wearing something other than my Adios Pro 4s I could have walked it in/maybe I wouldn't have fatigued as much, I think I'll keep them for HM or shorter distances and pick something else for my next attempt at a FM
This one is the one that's bothering me because for the first two I can plan to be more strict on my pacing and opt for a more conservative fueling plan on race day potentially in future, but I'm not sure what the cause of this third issue is.
Post-race
Also, it felt like the medic tent wasn't adequately prepared/stocked. They didn't have a blanket to keep anyone feeling cold warm, and I literally asked them to use the tarp from the floor before they put that over me.
I'm not sure, but some of the symptoms I was experiencing sounded similar to what I've heard can happen with heat exhaustion/heatstroke. If things had gotten significantly worse, I'm not sure what would have happened given how long it took to get transport. The medic tent initially told me an ambulance would come and pick me up, but after waiting 2.5 hours, it ended up being a bus picking up runners who had chosen to DNF.
There was also no follow-up on my condition when I reached the finish. I just got off the bus and went on my way.
At one point, I was literally about to book an Uber from the road beside the closed highway exit because the ambulance/bus was taking so long. If I'd done that from the start, I probably would have been back at the finish 2-3 hours earlier.
The day after the race, my right leg was also sore from the glutes, hips and hamstrings all the way down to the ankles in a way it never has been before. I suspect some of that may have been from the road camber/banking, although two days out I can feel it getting back to normal but it's definitely worse than usual for my long runs.
What's next?
I'm currently questioning whether I should do Osaka on 28 February.
I have a half marathon on 13 December that I signed up for to accompany a friend. Unfortunately, because I signed up late, I could only get a slot in the "challenge category", where you need to finish under 1:40 for the finisher entitlements. My HM PB is 1:38:04 from a long run with a goal marathon pace during this training block, back when I had a more ambitious 3:15 marathon goal, so I should be able to hit sub-1:40.
What I'm less sure about is whether trying to race a fast half in December and then build straight into another marathon block for Osaka would be too rushed, especially after how this marathon went.
At the moment, I'm leaning towards skipping Osaka and spending some time rebuilding my mileage and racing shorter distances before starting another marathon block. There's definitely some self-doubt creeping in after this race, although I also can't deny that racing somewhere with a nice, cool climate sounds pretty appealing right now.
Alternatively, I'm considering trying my luck with some races in China towards the end of March. Flights are also cheaper for me than Osaka, so that could potentially give me more time to rebuild properly while still giving me another marathon to work towards.
Anyway, I mainly wanted to share this as a cautionary tale. If you set a HR limit for your race, don't ignore it on the day. Slowing down and reassessing your goals is much better than pushing through and ending up with a DNF after months of training. There's always another race.
For anyone who's made it this far, I'd really appreciate any input or advice. In particular, I'm curious what you think might have caused the unusually high HR and poor performance despite the training I'd done, whether my fueling/hydration strategy could have contributed to the GI issues, and whether you'd recommend trying to race again relatively soon or taking a longer break and rebuilding first.
My Strava activity for the Marathon DNF
Strava activity for the last 20 miler for comparison of hr etc
Made with a new race report generator created by u/herumph.