Tom Cuddy

Exercise physiologist, bike fitter, & coach. Founder of Calibrated Coaching. Sometimes I race my MTB and ski in cool places.

[Tom Cuddy @cuddy_tom]

@knowledgeiswatt Gold standard for all testing modalities or just cycling?

[Tom Cuddy @cuddy_tom]

@Jamie_langley1 Hi Jamie, curious of your thoughts on if 1.15 is required for VO2max determination given what we know (or perhaps don’t know) of VLamax? I.e. would we expect a 1.15 RER for everyone regardless if their VLamax is .2 or 1.2 mmol/l/s.

[Tom Cuddy @cuddy_tom]

New article reflecting on this past season and how I’m using metabolic testing to specify training:

https://t.co/5g0G9csrjP

[Tom Cuddy @cuddy_tom]

@zbitter Especially when you find out how much those coaches are charging their athletes per month…

[Tom Cuddy @cuddy_tom]

@MicZanini One more question - do you think that the drop in VO2peak but not VO2 at LT challenges the idea of trying to get LT as high as possible relative to VO2max? I know this depends on the type of performance effort but maybe your thoughts on marathon?

[Tom Cuddy @cuddy_tom]

@MicZanini Amazing work—super practical for real-world coaching and performance.

Out of curiosity, how much variability did you observe in performance declines across the group? And were there cases where reductions in running economy were more pronounced than VO2peak, or the reverse?

[Tom Cuddy @cuddy_tom]

@jem_arnold From what I understand, some of the methods are determined from a step test while others are determined from a ramp test? Or is the ramp test only used for PPO?

[Tom Cuddy @cuddy_tom]

@jem_arnold Would be interesting if researchers included info on individual power profiles, CP/W’, etc. I’ve observed similar trends in mod-hvy domain BLa levels especially when comparing distance vs. middle distance runners. Crossfit athletes also tend to maintain high BLa.

[Tom Cuddy @cuddy_tom]

@coachjorgem 🎯

[Tom Cuddy @cuddy_tom]

@JimGalanes @neuromanter @soudalquickstep @Hytrotraining B strong. My sense was they were trying to explain that the cross sectional area of FT increases relative to ST.

[Tom Cuddy @cuddy_tom]

@JimGalanes @neuromanter @soudalquickstep @Hytrotraining I have no doubt BFR works, however, the ‘science-marketing’ behind it tends to be disappointing. In the certification course I took a few yrs ago, the instructors claimed that BFR converts slow twitch muscle fiber into fast twitch.

[Tadej Debevec @DebevecTadej]

When used appropriately in laboratory settings, the COSMED Quark and VO2Master Pro systems provide gas exchange and ventilatory data within an acceptable range for metabolic testing equipment that are both reliable and transferable between optimally performing devices.

[Tom Cuddy @cuddy_tom]

@Catalyst2Thrive @feelthebyrn1 @brady_h @hjluks I’ve been using mine for over 2 years! Has been instrumental in my coaching and consulting business for endurance athletes.

[Tom Cuddy @cuddy_tom]

@StephenSeiler @sweatscience It would be interesting to see a follow-up study of how long it takes him to improve his running economy back to baseline..any guesses on timeline based on the literature?

[Tom Cuddy @cuddy_tom]

@TrainingPeaks is launching a payment service for self employed coaches with a “transparent transaction fee of 5.9% +1$ per transaction.” This is absurd…

[Tom Cuddy @cuddy_tom]

@EliasLehtonen Such an interesting topic. Can you share any notable differences in training or other physiologic markers?

[Tom Cuddy @cuddy_tom]

@MountainRoche @JamilCoury @JavelinaJundred @Meg_Runs_Happy Running economy FTW 🤘

[Tom Cuddy @cuddy_tom]

@jem_arnold Similar to what you reported, RERs of .7 & .85 lead to a 3.8% diff in GE. In this sample, a 3.8 % diff in GE = ~8 W improvement. So maybe not that significant but I wonder about this thought experiment in higher power outputs seen in world tour riders?

[Tom Cuddy @cuddy_tom]

@jem_arnold Great figure Jem! My VO2master device doesn’t measure VCO2 (yet) so I typically report W/L O2.

Based on what you’re suggesting, I was curious to do a comparison of GE at LT1 assuming RER was .7 vs. .85 in some male cyclists I work with. Avg LT1 at 210 W (n=14).