Dr. Zeno Zani, through her profession as a sports doctor with a long experience in the field of sports traumatology, reached conclusions similar to those of Dr. Pruitt and Haushalter.
According to Zani the seat height is that which allows optimum knee to form a working angle of about 150-155 degrees, measured after knee on the line formed by the thigh and leg which are joined at the knee. This static measurement, Zani has also added a dynamic measurement. This involves placing the bike on a training session with the front wheel lifted 10 centimeters above the ground than the rear, so as to simulate the action uphill. After adequate heating, with the relationship longer, it takes the ride with a camera. Dynamics in cycling and watched the computer freeze, when the crank is located near the bottom dead center, the extension of the seat tube, with the pedal that is parallel to the inclined plane of the wheels, the angle formed by the line of the femur the theoretical tibia must be 15-20 degrees. The height of the seat must be calculated so that this corner is created dynamically.
The method Zani, despite the obvious differences, leads to a height of the seat quite high and quite comparable to that obtained with the method or Pruitt Haushalter. Then have a height of the seat rather high, which worsens the efficiency of pedalling, but ensures reduced stress to the knee. Pros and cons of this solution are the same as the other two methods. Again there is a certain complexity of determining the angle of the knee choir work, but nothing impossible.
Method of today
Today it continues the search for the correct saddle height. With the new tools, such as three-dimensional analysis of pedalling, we can understand and better determine the optimum height of the saddle, although many issues remain unresolved. Today, the main biomechanical studies determine optimal height of the seat with an angle dynamic (thus realized during the ride) made between the thigh and leg and subsequently measured at the knee. This angle should be between 130 and 140 degrees, although most studies suggest a much lower and range between 130 and 135 degrees. In all these studies have put the expressive power in comparison with the energy expenditure and the optimal range has resulted from the analysis of different athletes subjected to the tests.
These studies were carried out on athletes and were given as a main objective to have a better pedalling efficiency possible. Thus we find the seat height lower than the methods Pruitt, Zani and Haushalter, this means that there is a better speed in more than two dead, down and up, and greater speed in reaching the active phase, with workout more "roundabout". If the biomechanical efficiency is ensured, the saddle can expose the lower knee to greater trauma and injury.