Ergonizer Software e.K.

Save the date: 4. Nachwuchssymposium des Wissenschaftsrates der DGSP. Seien Sie am 19. September dabei. linkedin.com/events/4-nachw…

Our new paper about the magnitude and duration of performance decrements with COVID-19 (huge study population, mixed model analysis): journals.lww.com/acsm-msse/abst…

@jem_arnold It’s something like this: en.wikipedia.org/wiki/Michaelis… – so, none of the above :-)

Which shape describes the response curve best?

What shape response curve comes to mind?📈📉 During constant workload high-intensity exercise starting from rest, 🩸Blood lactate [BLa] 🩸increases...

@CoachSusigan For athletes, I think that steps longer than 3 minutes only bring disadvantages ...

@ergonizer What do you consider a too long stage?

The Natural Distribution of Heart Rates is ~Lognormal (w/occasional extremes), which explains the recent claims about the benefits of Z2 training. This is a sketch (not to scale, just to illustrate the problem; the scale vary with individual fitness). But with fitness -> barbell.

Winter School Exercise Physiology in Health and Disease, Salzburg. For more information please see pmu.ac.at/winter-school-… #amedtec @cosmedhq @ergonizer @hpcosmos @RadiometerMed #physiology #winterschool #paracelsusuniversity #meduni #exercisephysiology

@jem_arnold You should try a mixed model for repeated measures (MMRM). That includes modeling with a variable number of individual results ... 🧐

I'm thinking something with multivar mixed effects model. Stepwise var selection? Marginal R^2? What's a meaningful outcome if poly coefs themselves aren't physiologically meaningful? Descriptive? Predictive eq? This is all above my pay grade 🐣 Any help appreciated!

If I have repeat measures data like lactate curves and want to know how the 'shape' of the curve (not just LTs, peak) is associated with baseline characteristics, eg. sex, VO2peak, bodyweight (collinearity expected) What approach should I use? How has this been done before? 🤔

@jem_arnold Yes, most sprinters hyperventilate heavily after their race. And that's not just to breathe out CO2 ...

Also fascinating to see that even 100m sprinters are able to attain VO2peak within ~10-sec!

Relationships between External, Wearable Sensor-Based, and Internal Parameters: A Systematic Review mdpi.com/2063608 #mdpisensors via @Sensors_MDPI

@felipe_mattioni @uni_tue 👍👍

Christmas arrived earlier this year 🙏🏻 received today the certificate of my Ph.D. 🎓 @uni_tue

@Alan_Couzens Interestingly, the original conclusion sounds different: "Both LOW and MIX training programs improved performance and V O2peak by the same magnitude, whereas LOW attenuated the blood lactate response to a given exercise intensity more so than MIX". No influence on performance!?

For today's edition of #ClassicPhysiologyPapers A relatively recent classic by Steve Ingham and crew: 2 groups of experience rowers training the same volume: a) Does almost all volume in Z1-2 b) Does 30% High Intensity. Whose power at LT1 *AND VO2peak* increases the most?🤔

@Alan_Couzens Now it works, sorry!

@ergonizer That's weird. Live for me.

@Alan_Couzens The link seems to be dead ---

Paper: europepmc.org/article/med/18…

@jem_arnold @nntaleb @Alan_Couzens @waydiscipline The picture shows the hyperbolic increase pattern that I mentioned above. Since that is always the same, it is irrelevant at which moment you take your samples - you only have adjust the level …

@nntaleb @Alan_Couzens @waydiscipline Let me try this argument: The utility of 'arbitrary' LTs should be understood considering how incremental exercise responses predict constant workload exercise LT appears to be a function of intensity, but it is evaluated along a 'hidden' dimension of duration at each intensity

@jem_arnold @nntaleb @Alan_Couzens @waydiscipline Here's to consider that lactate also accumulates to some extent. Therefore, increasing stage duration results in increasing fuzziness. You measure something that did not happen at the respective step. That also applies to the LT(1) …

@nntaleb @Alan_Couzens @waydiscipline The point I'm suggesting is that analysing ramp BLa alone will appear like we're looking for the corner of a circle, without considering that LTs are an incremental operationalisation of a constant-workload construct (metabolic responses across intensity domains)

@jem_arnold @Toptimum_Perfor @JonasZakaitis @thenwerun And lastly: Unfortunately, 125W was left out here. This significantly worsens the possibilities for interpretation.

@ergonizer @Toptimum_Perfor @JonasZakaitis @thenwerun eg. this lovely figure from Bourdon et al 2018 pubmed.ncbi.nlm.nih.gov/29035635/ Δ ~25 W (visual interpretation) at LT1 from 3-min to 10-min in this subject is well within the group SD of ±40+ W, but I would suggest is meaningful for an individual. Thoughts?

So just tested a strong recreational runner (marathon PB 2:34) who’s been struggling with training and finishing races the last few years and wants to figure things out now. An interesting case, I think! Where’s LT1/LT2 and what do u see in the data?🧐

@jem_arnold @Toptimum_Perfor @JonasZakaitis @thenwerun Another thought: reliability and exactness also counts. Not given with the publication cited. But my feeling is that both gets worse with a longer step duration (less values means less averaging).

@jem_arnold @Toptimum_Perfor @JonasZakaitis @thenwerun I think this is good indication of my view: one could calculate identical references from each of the curves shown. The informational content is similar in each curve (little bit better at 3min). What is sometimes called LT2 is not a physiological but a computational phenomenon.

@Toptimum_Perfor @JonasZakaitis Could it also be that he is not reaching his 2:34 because he's going on too fast in his race attempts (due to his reduced exertion sensation)? Anyway, I do know too less about the case. That's the point.

@Toptimum_Perfor @JonasZakaitis @thenwerun I do not think (or say) that step duration does not affect lactate concentration. I meant that a changed duration does not affect reliability of any anchor points: A threshold is relatively as high with 2 minute steps as with 10 minute steps. Just at a different level.

@ergonizer @JonasZakaitis @thenwerun journals.plos.org/plosone/articl…

@spinmonk @JohanTanman @Alan_Couzens @Marinak12781887 Oups. That is important to know! I'll send an link to you privately ... sorry for the inconveniences.

@ergonizer @JohanTanman @Alan_Couzens @Marinak12781887 I'm interested to know if your software might be helpful for me. Unfortunately I seem unable to even access the trial version

Just racking up that time under 1.5 #PracticeWhatYouPreach