Alex Welburn
@alexwelburn.bsky.social
Lboro PhD student, Sport Scientist and Cycling Coach. Trying to work out the watt in W' & W’bal insights.
https://linktr.ee/alexwelburn
https://linktr.ee/alexwelburn
Reposted by Alex Welburn
Finally, someone has solved a real problem with AI! No more having to take a paper in the format for a journal that rejected you, and reformat it for a new journal. Well done!! formatmypaper.com
October 15, 2025 at 6:33 AM
Finally, someone has solved a real problem with AI! No more having to take a paper in the format for a journal that rejected you, and reformat it for a new journal. Well done!! formatmypaper.com
Reposted by Alex Welburn
It’s a complex thing W’ : link.springer.com/article/10.1...
The effect of reducing work rate on total work done and time to task failure during severe intensity exercise - European Journal of Applied Physiology
Purpose This study assesses the finite work capacity (W′) above critical power (CP) when work rate is reduced during severe intensity exercise and whether reducing work rate immediately prior to task ...
link.springer.com
November 12, 2025 at 3:32 PM
It’s a complex thing W’ : link.springer.com/article/10.1...
Reposted by Alex Welburn
Nice to see this paper by Alex Welburn et al. on W’ reconstitution modelling during intermittent exercise. Two @drphilipskiba.bsky.social models in here too, which must be good. Open Access. link.springer.com/article/10.1...
W′ reconstitution modelling during intermittent exercise performed to task failure - European Journal of Applied Physiology
Purpose W′ balance (W′BAL) modelling is becoming an important tool to monitor intermittent cycling performance. This study assessed the ability of different time constant (τW′) equations for W′ recons...
link.springer.com
August 18, 2025 at 9:44 PM
Nice to see this paper by Alex Welburn et al. on W’ reconstitution modelling during intermittent exercise. Two @drphilipskiba.bsky.social models in here too, which must be good. Open Access. link.springer.com/article/10.1...
Open access….rather expensive.
August 7, 2025 at 8:31 PM
Open access….rather expensive.
CP/W' testing complete both in the Lab and on the Road.
Mock 45 minute TT for individualise some parameters for the W'bal model.
BBS Suggest pacing with a 5% increase in mean power.
Now to tweak 2nd 1/2 after the climb, can see depletion of that below.
Execute on race day then write up paper
Mock 45 minute TT for individualise some parameters for the W'bal model.
BBS Suggest pacing with a 5% increase in mean power.
Now to tweak 2nd 1/2 after the climb, can see depletion of that below.
Execute on race day then write up paper
June 21, 2025 at 2:45 PM
CP/W' testing complete both in the Lab and on the Road.
Mock 45 minute TT for individualise some parameters for the W'bal model.
BBS Suggest pacing with a 5% increase in mean power.
Now to tweak 2nd 1/2 after the climb, can see depletion of that below.
Execute on race day then write up paper
Mock 45 minute TT for individualise some parameters for the W'bal model.
BBS Suggest pacing with a 5% increase in mean power.
Now to tweak 2nd 1/2 after the climb, can see depletion of that below.
Execute on race day then write up paper
Does anyone have lode bike 3 minute all out file they wouldn’t mine sharing? Would like to produce a chart of the power file as a figure example
June 21, 2025 at 2:41 PM
Does anyone have lode bike 3 minute all out file they wouldn’t mine sharing? Would like to produce a chart of the power file as a figure example
Anyone have an actual copy of this - Whipp et al 1982 ‘A constant which determines the duration of tolerance to high-intensity work’
June 18, 2025 at 5:10 PM
Anyone have an actual copy of this - Whipp et al 1982 ‘A constant which determines the duration of tolerance to high-intensity work’
A morning relatively well spent. Modelling different variations on the influence of durations on recovery based on some data we have. Tau left, duration impact of the work out on the bottom Baseline tau is 127s. Integrating into our model. Specifically for ITT, next step is weighted time factor.
May 24, 2025 at 3:44 PM
A morning relatively well spent. Modelling different variations on the influence of durations on recovery based on some data we have. Tau left, duration impact of the work out on the bottom Baseline tau is 127s. Integrating into our model. Specifically for ITT, next step is weighted time factor.
Reposted by Alex Welburn
Ignore what the press and critics say…this is an incredible classics campaign
April 21, 2025 at 4:04 PM
Ignore what the press and critics say…this is an incredible classics campaign
What else to do on a Sunday morning. TT W'bal app v0.02
March 30, 2025 at 10:12 AM
What else to do on a Sunday morning. TT W'bal app v0.02
A well paced TT here, 3 clear phases In the W’bal profile, final sector power was hovering around CP. Top 8.
Wind direction was a large factor in pacing as well.
Wind direction was a large factor in pacing as well.
March 11, 2025 at 8:00 AM
A well paced TT here, 3 clear phases In the W’bal profile, final sector power was hovering around CP. Top 8.
Wind direction was a large factor in pacing as well.
Wind direction was a large factor in pacing as well.
Piloting a few different protocols [More bits to come]. Some interesting observations so far.
First part works well - second part has one of the issues we have found. Developing a few tweaks to account for this. Can’t say that much on it just yet.
First part works well - second part has one of the issues we have found. Developing a few tweaks to account for this. Can’t say that much on it just yet.
March 5, 2025 at 9:10 PM
Piloting a few different protocols [More bits to come]. Some interesting observations so far.
First part works well - second part has one of the issues we have found. Developing a few tweaks to account for this. Can’t say that much on it just yet.
First part works well - second part has one of the issues we have found. Developing a few tweaks to account for this. Can’t say that much on it just yet.
For CP and W' SE values via 3 points - with the 2P non linear calculation I will take that.
last two studies - we have been really strict to minimise these SE values. As these are the inputs for the W’bal model.
Will look to add a function for these SE values into the prediction I.e high and low
last two studies - we have been really strict to minimise these SE values. As these are the inputs for the W’bal model.
Will look to add a function for these SE values into the prediction I.e high and low
March 5, 2025 at 5:56 PM
For CP and W' SE values via 3 points - with the 2P non linear calculation I will take that.
last two studies - we have been really strict to minimise these SE values. As these are the inputs for the W’bal model.
Will look to add a function for these SE values into the prediction I.e high and low
last two studies - we have been really strict to minimise these SE values. As these are the inputs for the W’bal model.
Will look to add a function for these SE values into the prediction I.e high and low
Another lovely example of a TT W'bal output. Two variations which demonstrate a slightly different narrative.
Individualisation is key 🔑 but it’s a balance with prev testing and specific testing along with what has been done and race/training data.
Currently developing something new/tweaks ;)
Individualisation is key 🔑 but it’s a balance with prev testing and specific testing along with what has been done and race/training data.
Currently developing something new/tweaks ;)
March 1, 2025 at 12:26 PM
Another lovely example of a TT W'bal output. Two variations which demonstrate a slightly different narrative.
Individualisation is key 🔑 but it’s a balance with prev testing and specific testing along with what has been done and race/training data.
Currently developing something new/tweaks ;)
Individualisation is key 🔑 but it’s a balance with prev testing and specific testing along with what has been done and race/training data.
Currently developing something new/tweaks ;)
Reposted by Alex Welburn
A.V. Hill was a hero, a genius, and the most upright person Bernard Katz ever met. He helped bring exercise physiology into being. Here’s our review of that story, published in @jphysiol.bsky.social. physoc.onlinelibrary.wiley.com/doi/full/10....
Blue plaque review series: A.V. Hill, athletic records and the birth of exercise physiology
Abstract figure legend Depiction of the world running records from 1925 studied by A. V. Hill and those of 2025 up to and including ultradistance events on a semi-logarithmic plot. These records, in ...
physoc.onlinelibrary.wiley.com
February 24, 2025 at 9:52 AM
A.V. Hill was a hero, a genius, and the most upright person Bernard Katz ever met. He helped bring exercise physiology into being. Here’s our review of that story, published in @jphysiol.bsky.social. physoc.onlinelibrary.wiley.com/doi/full/10....
I think this picture says it all. A fantastic weekend with two pb’s from two riders and a National champs jersey.
Privileged to be able to do something I love, and how my PhD supports it.
Privileged to be able to do something I love, and how my PhD supports it.
February 24, 2025 at 9:59 PM
I think this picture says it all. A fantastic weekend with two pb’s from two riders and a National champs jersey.
Privileged to be able to do something I love, and how my PhD supports it.
Privileged to be able to do something I love, and how my PhD supports it.
Still a lot of work to be done, but this is the start of it. We’ll have a few new inputs/variations into it from the findings of the PhD so far.
Likely turn a few parts into slider vs typing so UI is faster.
And to expand this for full sessions and a few cool things.
Likely turn a few parts into slider vs typing so UI is faster.
And to expand this for full sessions and a few cool things.
February 14, 2025 at 8:51 AM
Still a lot of work to be done, but this is the start of it. We’ll have a few new inputs/variations into it from the findings of the PhD so far.
Likely turn a few parts into slider vs typing so UI is faster.
And to expand this for full sessions and a few cool things.
Likely turn a few parts into slider vs typing so UI is faster.
And to expand this for full sessions and a few cool things.
Setmana Valenciana- W'bal Insights. Asides from the fact my PhD is based around this. I find it often paints a nice narrative of what happened. Hard push on 2nd to last climb, pace was hot on the last then eased. Then saved themself for final Sprint, with a few up the road.
February 13, 2025 at 7:52 PM
Setmana Valenciana- W'bal Insights. Asides from the fact my PhD is based around this. I find it often paints a nice narrative of what happened. Hard push on 2nd to last climb, pace was hot on the last then eased. Then saved themself for final Sprint, with a few up the road.
Tour of Oman Stage 5: W'BAL profile of two riders. Both finished well. Other a good few places ahead.
After W'bal is close to 0, it hovers low with slow recovery. They were unable to maintain the set pace, and continued around ± CP until the finish.
After W'bal is close to 0, it hovers low with slow recovery. They were unable to maintain the set pace, and continued around ± CP until the finish.
February 12, 2025 at 1:22 PM
Tour of Oman Stage 5: W'BAL profile of two riders. Both finished well. Other a good few places ahead.
After W'bal is close to 0, it hovers low with slow recovery. They were unable to maintain the set pace, and continued around ± CP until the finish.
After W'bal is close to 0, it hovers low with slow recovery. They were unable to maintain the set pace, and continued around ± CP until the finish.
Chrono Étoile de bessege - TT W'bal insights
#3 different variations for 𝜏w', showing differences. This was a well paced effort. Climb to finish. Also need to consider technical ability with speed/corners.
Consider which 𝜏w' you use - Paper on this hopefully out soon.
#3 different variations for 𝜏w', showing differences. This was a well paced effort. Climb to finish. Also need to consider technical ability with speed/corners.
Consider which 𝜏w' you use - Paper on this hopefully out soon.
February 12, 2025 at 7:13 AM
Chrono Étoile de bessege - TT W'bal insights
#3 different variations for 𝜏w', showing differences. This was a well paced effort. Climb to finish. Also need to consider technical ability with speed/corners.
Consider which 𝜏w' you use - Paper on this hopefully out soon.
#3 different variations for 𝜏w', showing differences. This was a well paced effort. Climb to finish. Also need to consider technical ability with speed/corners.
Consider which 𝜏w' you use - Paper on this hopefully out soon.
W'bal insights: Research Data from our work rate and fatigue study. Here is a fresh and fatigued W'bal output. in the Fatigued state there is a reduction. Maybe W' does not go back to 100%, Maybe 𝜏w' slows. Likely a combo of all. Fast component seems to be impacted the most.
February 12, 2025 at 7:12 AM
W'bal insights: Research Data from our work rate and fatigue study. Here is a fresh and fatigued W'bal output. in the Fatigued state there is a reduction. Maybe W' does not go back to 100%, Maybe 𝜏w' slows. Likely a combo of all. Fast component seems to be impacted the most.
A little insight into the German Hour record. I had a great time recording this with @PaddyTHarrison and Axel. open.spotify.com/episode/47C7...
Episode #10 - The German Hour Record: The Insights into Performance
The Performance Exchange · Episode
open.spotify.com
November 22, 2024 at 3:02 PM
A little insight into the German Hour record. I had a great time recording this with @PaddyTHarrison and Axel. open.spotify.com/episode/47C7...
Some days I enjoy more than others. Today is not one I’m enjoying 😂. Time to get thinking
September 3, 2024 at 1:59 PM
Some days I enjoy more than others. Today is not one I’m enjoying 😂. Time to get thinking
Playing around here, so [n=1] 40s on 20s off and then TTE (around 4-5 minute power), then 30 minutes recovery and we go again. Done at two different recovery powers. Dcp 68 ± 2and 35 ± 2 Appears a small drop in CP and 4-6% drop in W'. TAU individualised.
November 28, 2023 at 5:46 PM
Playing around here, so [n=1] 40s on 20s off and then TTE (around 4-5 minute power), then 30 minutes recovery and we go again. Done at two different recovery powers. Dcp 68 ± 2and 35 ± 2 Appears a small drop in CP and 4-6% drop in W'. TAU individualised.
Finally decided to have a go at ‘code’ been on my list for ages. Still an absolute beginner. Was very happy being able to print(“Alex”) 😂. Had some help as well but this is a good start. *excel graph but it managed to run the W’bal model for me. *yes no labels etc.
November 24, 2023 at 10:33 AM
Finally decided to have a go at ‘code’ been on my list for ages. Still an absolute beginner. Was very happy being able to print(“Alex”) 😂. Had some help as well but this is a good start. *excel graph but it managed to run the W’bal model for me. *yes no labels etc.