In terms of total energy expenditure is it more expensive running a 10 km race at 10 km/h or at 20 km/h? If we don’t consider the air friction component and if the race is run without any pace variation (steady state), the answer is: the total energy requirement is approximately the same!
The reason lies in the linear relationship between oxygen consumption and running speed. As a rule of thumb, during horizontal running the energy cost is about 1 kCal/kg/km. Thus, the energy cost of running 10 km for a 70 kg individual averages 700 kCal, regardless of running speed.
Having an ergospirometer, as explained in the previous Part 1 and Part 2, allows to know the relative contribution of Carbohydrates and Lipids in the energy transfer system; in Figure 1 the data are put together in a graph, and the main results can be described as follows:
- the whole-body energy requirement increases up to 15-20 times above resting levels (purple curve);
- for this athlete, between 6 and 10 km/h is evident the formation of a plateau where the ratio between Fats and Carbs contribution is constant;
- training to extend the plateau is something to focus on, since the energy contribution of Fats is more than double of the Carbs’ one (9 kCal/g vs. 4 kCal/g);
- the higher the speed, the lower the Fat’s contribution;
- training at low speeds is a good way to “teach” the body to use the Lipids as energy source;
- doing a Conconi test will allow the athlete to know exactly the different “fuels” contribution at his anaerobic threshold;
- Proteins contribution is not taken into account, as explained in Part 2.
|Figure 1 – Energy expenditure during running.|
We are working on the fourth part, wich will be published after the next test session. Meanwhile…keep on training, people!
- How to publish your Garmin training data to other services with “tapiriik”
- Heel-to-toe drop: meaning and measurement
- Garmin, Polar and WTEK: heart rate sensors comparison
- What is training load?
- Runner’s performance evaluation – Part 1: the VO2max.
- Runner’s performance evaluation – Part 2: Carbs, Fats and Proteins as Energy for living.
- Motivation for training: two inspirational speeches by John Doman.
- A pseudo-“Conconi test” to predict the anaerobic threshold
- Running at 4000 m: the hypoxic chamber
- Can the Kinematics of arm movements be trained to improve Running Economy?
- Forest steeplechase training
- Snowy workout in the forest
- 2013 Track & Field season – Chronicle of a Steeplechase year
- 2012 Track & Field season – Chronicle of a Steeplechase year
- My 2011 in numbers – Happy new year!
- Omni-Lite ceramic track spikes
- 7th Airport Run Berlin: second place and PB
- A good way to end the year
- Cone-Project presents: “Emozioniadi” 2012
- Tough Guy: the safest most dangerous event in the world
- 24th Lauf im Britzer Garten: a good pre-season test.
- 32nd Pankower Frühlingslauf
- BIG 25 Berlin 2012: a new World Record!
- The hardest 400 m of the World: the “Red Bull 400”
- Trail running in the dark: 4^ Notturna di Sant’Antonio – Miane (TV), Italy
- Talkin’ blues: when XC meets life. Offene Berlin-Brandenburgische Crossmeisterschaften
- “Non Solo Sport Race” – Padova, 28th August 2011