Personal collective of ideas, thoughts and notes
Tracking cycling endurance training progress over time. As I have shifted my focus from MTB racing to Endurance/long distance triathlon, My sprint power has decreased slightly (5 minutes and 1 minute) but FTP (20 min+) has slowly been ticking upward. Since I have been swimming and running more, it probably has not increased as much as I hoped, but I am learning endurance is not something that gets established overnight ….
Super interesting article on the use of Hypoxanthine (from sweat) being used as a predictor of performance in athletes.
Having done HR tracking, Power and over the last couple of years, Lactate, it’s always interesting to hear of new methods and advancements in performance, and opportunities to improve metabolic health. So while I am still waiting for a reasonable/practical real-time Lactate monitoring solution, maybe I should skip to the next big thing …
Check it out here: https://pubmed.ncbi.nlm.nih.gov/23670363/
Purine metabolism reflects the exercise-induced muscle adaptations and training status. This study evaluated the utility of plasma hypoxanthine in the prediction of actual sport performance. We studied male athletes: 28 triathletes (21.4±2.9 years), 12 long-distance runners (23.2±1.9 years), 13 middle-distance runners (22.9±1.8 years) and 18 sprinters (22.0±2.7 years). Season-best race times were considered, achieved over standard triathlon, 5 000 m, 1 500 m and 100 m, respectively. Incremental treadmill test was administered to determine maximum and “threshold” oxygen uptake. Resting and post-exercise plasma concentrations of hypoxanthine, xanthine, uric acid and lactate were measured as well as resting erythrocyte hypoxanthine-guanine phosphoribosyltransferase activity. Simple and multiple regression analyses were used to identify significant contributors to the variance in performance. Hypoxanthine considered alone explained more variance in triathletes, long-distance runners, middle-distance runners and sprinters (r 2=0.81, 0.81, 0.88 and 0.78, respectively) than models based on aerobic capacity and lactate (R 2=0.51, 0.37, 0.59 and 0.31, respectively). Combining purine metabolites and cardiorespiratory variables resulted in the best prediction (R 2=0.86, 0.93, 0.93 and 0.91; r=0.93, 0.96, 0.96 and 0.95, respectively). In summary, hypoxanthine is a strong predictor of performance in highly trained athletes and its prediction ability is very high regardless of sport specialization, spanning the continuum from speed-power to endurance disciplines.
Another 3D printed bottle holder for my Canyon Speedmax. This is a raised bottle holder for between your arms and mounts a traditional water bottle cage.
The typical distance between for the mount holes on cages are 64mm. 2 100mm M5 bolts keep the mount attached to a custom made carbon fiber base plate.
I could not justify spending $1500+ on a aero disc wheel, so I went with a more budget friendly alternative from the company EZGains. It is essentially a disc cover which can be attached to your existing wheel set with nearly identical benefits as a traditional disc wheel.
Below are some interesting statistics regarding disc wheels and these types of aero gains: (From EZGains website)
Tests 31st January 2023 using rim tape and a rider holding the exact position within the green lines set out from base ride.
The idea was to validate that putting one of these covers on your wheel actually makes you faster. Spoiler – it does! We had an array of quality carbon wheels of different depths with EZDisc covers for each, one aluminium box rimmed training wheel, one relatively cheap disc wheel and one relatively expensive disc wheel to play with. The test itself was with the wheels on my TT bike, with the wheels spinning, without a rider. Why? The rider adds far more drag than a wheel so unintentional movements can mask the differences the wheels make. We tested with wind speeds of 30, 40 and 50kmph, with wind angles of -15 degrees through to 15 degrees. The results were unequivocal! This graph shows lines, one per wheel, for the aerodynamic drag (the “CDA“), including the bike, against the wind angle (the “yaw”). It’s averaged across the wind speeds. The lower the CDA, the better. As you’d expect the training wheel performed worst (the top line in dark grey).Then there is a group of all the carbon wheels. Surprisingly the depths from 38 to 88 all performed similarly, with the deeper rims just outperforming the shallower ones at higher yaws. Then there is a grouping containing the real disc wheels and the disc wheels with covers. There’s very little difference between these. These distinct groupings show the disc covers improving the aerodynamics of the wheels up to the same performance as normal disc wheels! Bearing in mind these are a fraction of the cost, this is a pretty big finding! What do those figures mean in terms of racing? Plugging the differences between the wheels with and without the disc into a calculator or directly using the formula you can work it out the saving.
I did a lot of running, riding and swimming 🙂
My 3D design skills and understanding of modeling around a physical object have come a long way since my first bike storage box, this one fits my 2022 Canyon Speedmax CF (Medium). The reason for designing and printing these is that while the bike has built in storage, it’s seldomly enough to be self sufficient during long rides. For full distance Ironman events, I take the following: (After mishaps, trial and error) 2 x Tubolito spare tubes, 2 x CO2 Cartridges, 1 x Dart puncture tool, 1 x Mini Pump, a Multi Tool and a Chain link.
Design: Autodesk Fusion 360
Printer: Prusa Mk2
Material: PLA
Print Time: 12 Hours
How to perform a DIY Test: https://www.youtube.com/watch?v=MYA8gzF9Zd8
Do not perform a test if you base (i.e. before exercising) is greater than ~ 1.8 mmol/L. Spin easy for 15 mins and try to get it down before starting the ramp test. Otherwise, don’t waste the test strips.
First middle distance triathlon! Fast swim, great bike and HOT run! Fun times!
