Martin MacInnis

Dad, assistant professor, exercise physiology researcher. Interested in muscle metabolism, hypoxia, nutrition, wearable technology, and science education.

[European Journal of Applied Physiology @EJAP_official]

Research involving 19 cyclists shows that power output at RCP calculated using a step-ramp-step protocol is lower than uncorrected estimates. This highlights the impact of methodology on determining exercise thresholds.

https://t.co/XwEFthhRXo

[Hilkka Kontro @HilkkaKontro]

In our new EJAP paper with @MartinMacInnis, we found that the respiratory compensation point (RCP) agrees well with critical power (CP) if individual VO2 kinetics are accounted for (and poorly if ignored), but the CP model chosen also affects the agreement.

[Journal of Applied Physiology @japplphysiol]

Before your next ride, take into account the fantastic work from @uofcknes, The influence of sex, hemoglobin mass, and #skeletal #muscle characteristics on #cycling critical power (Allison Caswell et al.):

https://t.co/js8K0Jwzv0

[Technavance @technavance]

🌟 Grateful for the wonderful feedback from @MartinMacInnis, Associate Professor at @UCalgary! From custom equipment solutions to ongoing support, we're committed to the success of every researcher we work with.

Read more reviews at the link below!

https://t.co/FjZHnyWLC0

[Journal of Applied Physiology @japplphysiol]

Research Article by RS Ghitter (@MartinMacinnis) #Sexdifferences in the power-duration relationship for dynamic #knee extension are largely explained by #muscle size
https://t.co/kh0YyyrKNP

[Journal of Applied Physiology @japplphysiol]

Research Article by @ZhangJens et al. (@MartinMacinnis @UCalgary) #Neurophysiological and #perceptual responses to consecutive days of exhaustive #highintensityinterval #cycling are dissociated
https://t.co/d4L3ibfLhQ

[Hilkka Kontro @HilkkaKontro]

How to quantify the training load of higher intensities and sprints, separately from aerobic training load, simply from power data? We suggest a 3D strain score (alternative to the "1D" TSS/TRIMP/work -> fitness paradigms) to capture the nuances of training CP, W', and Pmax.

[Technavance @technavance]

Reminder: Less than 8 weeks left to apply! ⏰

There’s still time to apply for the 2nd Technavance Student Travel Award. If you’re presenting research at a conference in 2026, you could win up to $500 to support your travel.

👇 Apply here:
https://t.co/sJnNO0Ybmp

[Alex Hutchinson @sweatscience]

This wasn't on my bingo card for 2025 - but yes, I'm giving a lecture hosted by TPL's famed Arthur Conan Doyle Collection on Nov 29!

I'll be talking about blank spaces, armchair exploring, and the pursuit of "useless knowledge." Come check it out!

[FloTrack @FloTrack]

Dunfee has done it! 🥇

After narrowly missing gold in multiple global championships, 34-year old Evan Dunfee is the 2025 35km race walk World Champion. He finished in 2:28:22, ahead of Brazil’s Caio Bonfim in 2:28:55, and Japan’s Hayato Katsuki in 2:29:16.

#WCHTokyo25 coverage presented by @brooksrunning

[CBC Olympics @CBCOlympics]

WORLD CHAMP 🇨🇦🥇

With grit and determination, @EvanDunfee wins Canada's first medal of #WCHTokyo25 and it's a GOLD 🙌

[Devin Heroux @Devin_Heroux]

Evan Dunfee just grabbed a Canadian flag from fans lining the track.

He’s now charging into the stadium.

It’s going to be go gold. Incredible.

[Jem Arnold @jem_arnold]

When does resistance exercise become endurance exercise? 🏋️↔️🏃

It might depend on the critical occluding tension in our muscles 💪🩸

🧵/ 📚link👇

A Critical Occluding Tension Phase Transition Occurs Between 30-40% 1RM in Dynamic Knee Extension Exercise

[Experimental Physiology @ExpPhysiol]

Nominations for our Inaugural Review Prize are open!

🏆 The winner will receive £1000, and publish a Review Article in our journal.

📆 Nominations are open until 31 July 2025.

📜 Find out more about how to apply and submit your proposal: https://t.co/FF0oMFKKwQ

[Brian Carson @DrBPCarson]

🚨PhD alert 🚨 looking for interested candidates to apply for a fully funded PhD in Physical Activity, Sedentary Behaviour & Metabolic Health of new parents. For enquiries DM or brian.carson[at]https://t.co/ZJEQS0oXFh & include CV. Must be willing to work on app over next 3 weeks

[Alex Hutchinson @sweatscience]

1953: Hillary & Norgay climb Everest with O2, Bannister just misses sub-4 with lapped pacer

2025: 4 Brits climb Everest with xenon, Kipyegon aims for women's sub-4

My thoughts on history, fair play, and the problem when everything becomes a competition.
https://t.co/penguMdVU3

[The Hornberger Lab @HornbergerLab]

1/10 Excited to write this thread summarizing our new paper in @NatMetabolism, which identifies a potentially critical part of the signaling pathway that drives skeletal muscle growth in response to resistance exercise!
Free link https://t.co/JWca6dVU2a
#Myotwitter @NIH_NIAMS

[Australian Physiological Society @AuPhysiolSoc]

🎉 The Australian Physiological Society turns 65 in 2025!
Add to your calendar the annual meeting, 23–26 Nov at Western Sydney Uni (Parramatta), to celebrate 🧠🔬
Cutting-edge science, networking & more!
#AuPS2025 #Physiology #STEM #AusSci #65YearsStrong

[Technavance @technavance]

🔬 Meet Rachel Ghitter, a grad student at the @UCalgary! Her research explores sex differences in muscle performance. She’s up to win our Student Travel Award and is presenting at the 2025 @csep_scpe annual conference! Vote for Rachel here 👇

https://t.co/sJnNO0Ybmp

[Hilkka Kontro @HilkkaKontro]

New! We measured rates of hemoglobin synthesis in trained and untrained individuals and found them to be similar despite some earlier work showing shorter RBC lifespan in athletes. @MartinMacInnis https://t.co/RKzxSu8YYM