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silver mondeo wrote:
148+139到鳳山...(恕刪)
以 TT 來說，VI 越接近 1.0 ，速度就會越快。
Variability Index (VI):
A follow up term from the above, initially coined by Charles Howe, is the Variability Index.
The calculation:
This is simply the normalized power divided by the average power. So, in the scenario above, we would say that the 100/200/300 ride had a variability index of 1.20 (239NP/200AP).
This is a good indication of how ‘smooth’ the ride was. In an Ironman context, VI numbers are typically low, ranging from 1.0 to 1.05 for flat courses and 1.05-1.1 for hilly courses.
There is an optimal VI for each athlete on each course that gives the athlete the greatest speed for the lowest effort. This is related to course factors such as the number and grade of hills, which reward the athlete with more relative speed for a given power and the physiological peculiarities of the athlete – while it may be tactically optimal to put out 300W going up the hill and 100W descending for an average of 200W, if 300W puts the athlete over their threshold and the descent isn’t long enough to clear the lactate, tactically optimal doesn’t matter!
For this reason, the best way to determine an optimal VI for a given athlete is with multiple race sims on a given course using differing power output strategies and seeing which affords the athlete the greatest speed/power combo.
新的 Garmin 500 韌體，開始出現 TSS/IF。
(雖然具體我不知道到底TSS公式是不是TP發明的，但 Garmin 採用就表示這個公式已經具有相當可信度）
讓我合理的懷疑 Garmin 跟 Training Peaks 已經開始有某種程度的合作了。
假設 TP 跟 Garmin 510/810 合作有成，TP系統的教練人數就會開始激增......
坐在家裡就可以即時看到、分析選手在作什麼(甚至要用耳機叫選手不要偷懶都行），讓自行車訓練的侷限變的更小！
www.cycliving.com
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