A little different perspective
I'm going to try to keep this brief but I'm another one in favor of wt training and here's why:
- The body will preferentially fire certain muscle fibers in a muscle group. This is related to neurological hardwiring. Without overload of some sort, the body will keep firing those same muscle fibres and not use others. In endurance sports, what prevents fatigue is the body's ability to recruit different muscle fibres at different times to allow individual fiber groups to recovery. So while you may only need to contract 5 % of your quads to produce a pedal stroke, you do need to change which 5 % you are using at any one time in order to continue to produce thousands of pedal strokes. This can be achieved through long hours on the bike, forcing your muscles to fatigue and thereby learn to use other muscle fibres and change your hard wiring, or you can do it with weights in conjunction with cycling. Wts can provide the overload to train the nervous system to use different fiber groups in a single muscle. Since most of us can't ride 6 hours a day like Lance did to train, strength training is a good option.
- Strength training increases the tensile strength of body tissue making it more resistent to damage from overload or overuse. This is also a matter of physics. Biophysics.
- Last and most important IMO is that it is well documented in the medical literature that osteoporosis is a problem in the elite cyclist. Cycling does not protect bone mass. Strength training does. As this a forum of women that I hope wish to contine a good quality of life, this is a very important point. Osteoporosis is devistating.
In summary, physics can not be taken out of the context of muslce physiology, neurology and biochemistry if you're discussing a living, moving creature. Equus said it well, strength training can be adapted for any goal. But it also has a bearing on health and the risk of osteoporosis in women and cyclists can not be ignored.
I'd also like to say that many good points were made on this thread. And I feel that TE is a discussion forum of high quality.