Cycling Training Tips

Jesper Bondo Medhus

I am a medical doctor with a special interest in cycling training. I work at the Hospital of Vejle using clinical physiology and nuclear medicine to diagnose cancer and heart patients. Author of the book: Mastering the Art of Race-Specific Training (Kindle and paperback).

Power output agreement between Polar and SRM

Power meters are very expensive and for many people it is a big decision to buy one. Polar offers one of the cheapest power measurement systems on the market, so it was interesting for me to see how it performed compared to the much more expensive SRM crank system. SRM crank system uses torque and angular velocity to measure power output, while Polar uses the vibration and speed of the chain to calculate power output.

British scientists made a study with 12 trained men who made 12 all-out efforts separated with short recovery periods. This study setup is very demanding for the power meters, since the stress on the bike is very high. The purpose of the study was to compare the agreement between these two different systems. The results were published in Journal of Sports Science, August 2006.

Polar underestimates power output

The main finding was that Polar underestimated the power output and did not agree with the power output from SRM. One of the great problems with the Polar was that it was greatly influenced by chain vibration and sampling rates.

These findings agree with the experiences I have been told about Polar. If you ride on cobble stones it is not reliable at all and it is necessary to change chain often. It is obvious that you can not get a precise system like SRM and only pay 1/10. For me Polar offers a cheap entry level for riders who would like to explore power outputs without spending all their money. I believe that you can make analyzes of races and get a good feeling of how races are. But I am not sure, that Polar is good enough for pacing in intervals. Maybe I should go try one?!

Reference:
Hurst HT, Atkins S. Agreement between polar and SRM mobile ergometer systems during laboratory-based high-intensity, intermittent cycling activity.
J Sports Sci. 2006 Aug;24(8):863-8.

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Inspiratory muscle training might improve endurance

Inspiratory muscle training is done against an external resistance when you breathe. There are several products (POWERbreathe, PowerLung, Ultrabreathe etc.) on the market claiming they can significantly improve your endurance. I have done some studying in Cochrane Library and Pubmed to figure out what we know about inspiratory muscle training for trained cyclists.

Inspiratory resistance training improves maximum inspiratory pressure

Nearly all studies find that it is possible to improve the maximum inspiratory pressure, but it remains uncertain whether this improvement actually affects cycling performance. Most studies have in common that they have used very small study groups with less than 10 participants in each group in the randomized placebo controlled studies. I am pretty sure that inspiratory muscle training does affect maximum inspiratory, but these respiratory muscles are also trained during hard aerobic exercise.

Respiratory muscles get exhausted during hard exercise
The first time I was introduced to exhausted inspiratory muscles was after a long race with a very high intensity. When I took a deep breath afterwards, I could feel pain in my inspiratory muscles. My conclusion was that vo2 intervals and racing probably gives your respiratory muscles a great stimulus.

Inspiratory muscle training – Yes or no?

As I have previously discussed, it remains uncertain whether strength training improves aerobic endurance. It seems like we have a similar problem with respiratory resistance training: Strength training for inspiratory muscles and skeletal muscles both increases maximum strength, but it remains unsure if there is a benefit for you in a competition.In a Cochrane review it is concluded that “Currently there is insufficient evidence to suggest that inspiratory muscle training with external resistive breathing devices provides any demonstrable clinical benefit in patients with asthma.”

So until we get more scientific evidence, I can not advice you to use respiratory resistance training regularly because there is not (enough) evidence for its benefits. On the other hand there is no doubt that instruments like Powerbreathe, PowerLung or Ultrabreath can train your respiratory muscles in a way you can’t train them during endurance training. I can’t think of any unwanted side effects to respiratory training, so if think it sounds interesting you can give it try. They are non-invasive and inexpensive, so it might be a cheap improvement for your performance.

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5 Biggest Mistakes in Heart Rate Monitor Training

1 – Comparing heart rate values with others

The fact is that you can only compare heart rate values with your own previous registrations. The reason for this is that we all have a different anatomy of our cardiovascular system. But these systems are all based on the same physiological mechanisms. Thus, we can learn from each others’ physiological experiences and adaptations, but we can’t compare individual heart rate values. E.g. your resting heart rate is 58bpm while your friend’s heart rate is 42bpm, still I can’t say which one of you are in the best shape nor have the highest VO2 max.

Your maximum heart rate is correlated to your age, but that does not mean that we all fit in to 220-age formula. There is a huge standard deviation because we all are anatomically different. Just like with the resting heart rates, maximum heart rates does not predict performance.

2 ”“ Not being aware of factors affecting heart rate

Your working heart rate at the same external workload changes from day to day because it is affected by several factors including caffeine, water balance, temperature, physical stress, psychological stress etc. Thus, you should know how these things affect your heart rate since that is essential if you want to use your current heart rate for pacing. Taking action of the response from your heart rate monitor on your effort is an important part of using this tool. E.g. if you feel your heart rate is too high compared to the workload, then consider if there is a good reason for this (dehydration, too much coffee etc.) When you have found the answer, then take action on it.

3 ”“ Not analyzing heart rate data

Heart rate monitor training is much about analyzing. If you have an advanced or professional heart rate monitor from Polar, you can collect tons of data for analyzing on your personal computer. This is an important process if you want to get the full value out of your heart rate monitor. When you get used to see your heart rate records, you will begin to get a deeper understanding of how your body works. If you add some studying in exercise physiology to your analyzing, you will be able to make better decisions about your future cycling training. And that is exactly the point of spending reviewing your bike rides.

4 ”“ Wrong use of heart rate monitor during races

When you enter a race, you will see that you are able to ride faster than you normally do at training. It is difficult, if not impossible, to make clever decisions based on your current heart rate in a cycling race. I’ve heard several riders give up, when they were trying to jump from the peloton because they thought their heart rate indicated that they should slow down. That is definitively a big mistake since there is large tactical factor in play in cycling races. Thus, if you are lucky, the peloton will slow down and stop struggling to close the gap. And that is why experience is so much more important in races than heart rate registrations.

5 ”“ Wrong use of target zones during training

Heart rate target zones are a way to categorize different types of training. Many riders use basic training programs where they are supposed to work at percentage of their maximum heart rate. But these programs are born to be inadequate since there is a huge deviation in relative working heart rates (Just like with minimum and maximum heart rates). Thus, these target zones should be based on your personal experiences and testing procedures, not a general formula. Also I will recommend you to not making the target zones to small, because of the factors influencing on the heart rate. One day you are in top of the target zone and the next day you are in the bottom, but the subjective feeling might be the same. Thus, if the interval is too small you are likely to cross the limits which will make you work either easier or harder to stay in the target zone.

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Last chance to participate in the Power Meter Profile Project is 31st of July

The Power Meter Profile Project has been collecting power meter data from riders from all over the World for the last 3 months. 31st of July is the last chance to join this project and make the total data amount even better. Thus, if you haven’t submitted your power records yet, then it is about time to fill in the form on this site. If you know about PowerTap or SRM users who have performed these tests then please ask them to submit their data. The more data we get, the more power to this study.

Read more about the Power Meter Profile Project here.

I will publish the results and conclusion in August.

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Interview with Gonzalo Vilaseca about the Power Meter Project

I made a short interview with Gonzalo about his impressive results in the Power Meter Project:

Your 5min maximum power went from 357Watts in week 1 to 416Watts in week 12. What impact has this increment had on your performance?

Gonzalo: “No, because I haven’t done any short races since then. My wife had a baby and I couldn’t race for some weeks, since then there have been no more races, I hope the second part of the racing season starts soon.”

How will you describe your progress through the project?

Gonzalo: “My short time power increased dramatically, my recovery from short efforts also improved, which was what I was looking after: changing from endurance races to ‘criterium’ style races.”

What is your opinion on power meter training now?

Gonzalo: “More or less the same as before, but some things have changed: I don’t focus that much on the powermeter when riding endurance sessions, and I listen more to my body, if I feel Im reaching a physicall and mental limit I rest for a week. But all in all I believe power traing is THE method to use.”

Have you adapted some of the ideas from the power meter project into your daily training?

Gonzalo: “Not now, but I will. Now Im riding endurance races, but in two weeks I switch again to short races and I will follow some ideas of workouts I did during the project.”

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