Marcelo Heinig

⚕️ MD & endurance athlete.
🔢 Passionate about how science and data push physiological limits.
⚡ Creator of

[Marcelo Heinig @marceloheinig]

@Alan_Couzens The real solution is building a fitness base that allows you to easily burn 600+ kcal/hour in Zone 1. We need to build bigger engines, not just restrict the fuel.
​This isn't about aesthetic preference; it's about health.

[Marcelo Heinig @marceloheinig]

@Alan_Couzens Spot on. In a sedentary world with low VO2 max, continuous caloric restriction is a losing battle that leaves people dependent on GLP-1 drugs.

[Marcelo Heinig @marceloheinig]

@Alan_Couzens I agree! I’ve been checking my HRV every morning for years. If it’s good, I will do my goal session; otherwise it will be rest/short Z1 session. I only push when my body shows me it's ready to handle it. I always weigh whether alcohol is worth the stress... and at 48 it rarely is

[Marcelo Heinig @marceloheinig]

@Alan_Couzens Currently at a BMI of 23.5, aiming for 21 by September. Still got a fair amount of body fat to shed.

[Marcelo Heinig @marceloheinig]

@Alan_Couzens Same here...

[Marcelo Heinig @marceloheinig]

@Alan_Couzens Completed 8 weeks of training since Feb. Garmin VO2max est. went from ~56 to ~64. HR intensity distribution from the same period. Just an estimate, but confirms your point.

[Marcelo Heinig @marceloheinig]

@DelRealMartin2 It is striking how early the crossover point occurs in this population and the implications this has for obesity management.

[Marcelo Heinig @marceloheinig]

@DanielBerglind I didn't use ChatGPT 4o and Claude 3.5 much back then... but I imagine they have evolved significantly as well.

[Marcelo Heinig @marceloheinig]

@DanielBerglind It's hard to evaluate anything properly... by the time a study is published, we are already 2 models ahead of the one used in the research.

[Marcelo Heinig @marceloheinig]

@inaki_delaparra @Garmin They offered a security deposit option: they sent the new watch, I returned the old one after, and got my deposit back days after they received it.

[Marcelo Heinig @marceloheinig]

@inaki_delaparra @Garmin Initially, they asked me to send the old one first, but I explained I used it daily and was training for a race & couldn't be without it.

[Marcelo Heinig @marceloheinig]

Expected peak power: 402 watts
Expected best 1-minute power: 393 watts

The power achieved in the last stage aligned very closely with the power predicted for this ramp protocol, given the athlete's CP and W'.

(The platform uses 75% of best 1 min power as FTP)

[Marcelo Heinig @marceloheinig]

Recent test... estimated CP 275 watts and W' 24302 joules from 3 maximal intervals under 3 min.

[Marcelo Heinig @marceloheinig]

If you calculate when an athlete with a CP of 275 watts and W' of 24302 joules should fail when performing a 20 w/1 min ramp test, we find that failure should occur 7 seconds into the 400w stage.

https://t.co/LJYJvssDSy

[Marcelo Heinig @marceloheinig]

Ultimately, if it works for you, use it! If not, then simply look for another method that does.

[Marcelo Heinig @marceloheinig]

Hey everyone who loves to tinker with physiological models! I've built a personal project to estimate CP & W' from intervals under 3 minutes. (1st webapp - excuse any beginner's quirks!)

Check it out: https://t.co/CVPG2jxXrY

@SeanSeale @jem_arnold @MedBonnevie @StephenSeiler

[Marcelo Heinig @marceloheinig]

The tool has already helped me come up with ideas about the impact of various changes, such as athlete position, fatigue, and nutrition, on my power curve.

[Marcelo Heinig @marceloheinig]

Regardless, feel free to play around with the tool and assess how a few extra watts in a sprint, or in the 60-second and 3-minute efforts, affect the curve's shape.