1 / 13

Why Power

Why Power. Topics. What is power and how can we measure it? Principles of training. What is Power?. Power is simply the amount of mechanical work or energy you expend in a given time frame measured as a watt . Power = Work = Joule Time Sec. Power for Bike & Rider.

dena
Download Presentation

Why Power

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Why Power

  2. Topics • What is power and how can we measure it? • Principles of training

  3. What is Power? Power is simply the amount of mechanical work or energy you expend in a given time frame measured as a watt.

  4. Power = Work = Joule Time Sec Power for Bike & Rider All the Forces Resisting Movement x Speed Power at the Hub (or crank) Torque x Cadence or Angular Velocity Push Harder or PedalFaster

  5. Kjoules to Kcals 1 Kcal = 4.186 Kjoules 1 Kcal 4.186 Kj E.g., Work on Bike 1000 kj x = 239 Kcal The number of kcals burned by your body is actually much higher and depends on how mechanically efficient you are. Most humans are about 22% efficient on a bike, meaning only 22% of the kcals you burn actually goes into the bike. 239 ÷ .22 = 1086 kcals burned by the body

  6. Points of Reference • 1 horse power = 746 watts • A 68 kilogram (150 lb) rider with an 8.6 kg (19 lb) bike at 32 kph on flat ground with no wind requires about 177 watts • 56.5 W are required to press a 20 lb dumbbell 25 in. Overhead in one second • Tour de France winners can generate 465 watts for over 30 minutes

  7. Why Use a PowerTap? • Power is the most objective measure of intensity • RPE is too subjective by itself and relies on too many factors • Speed changes with terrain • Heart Rate response lags behind actual effort and measures body’s response, not the work being done

  8. The principles of training have not changed.

  9. Specificity • Training adaptations are highly specific to the activity and environment. • Pattern of power output. • Joint and body positions. • Speed of movement. • Temperature, humidity, altitude, wind. • Availability and type of food. • Terrain. • The best way to develop better training strategies is to better understand the demands of racing.

  10. Training is Overload • A training stimulus is only a training stimulus if the “load” is greater than recently experienced. • Overload: greater force, faster speed, higher power, longer duration, more work. • In order to adapt the body must be placed under an unfamiliar and stressful load that acutely disturbs homeostasis.

  11. Overload Concerns: Fatigue • Overload training is in addition to other life stressors. Account for the combination. • Overload is fundamentally about exceeding previous performance limits and exceeding limits can lead to illness, injury, and sometimes over-reaching/overtraining.

  12. Recovery • Overload phase ends with an acute drop in performance, whereas the recovery phase ends with a restoration or increase in performance. Choose recovery rather than trying to have a perpetual overload. • Adaptive processes occur during the recovery phase (e.g., protein synthesis, restoration of homeostasis). • There is no such thing as overtraining, just under-resting.

  13. Individuality • Fields are born, winners are made. • Each individual is their own scientific experiment.

More Related