Time per kilometre

Estimating the time per kilometer may or may not be relevant, depending on the objectives.
If the purpose of the race is sporting, whether competitive or not, and regardless of the level, taking the time per kilometer into account is of great importance.
This is because only by appreciating a reduction in minutes per km in a maximum performance can we be sure of having progressed.
Furthermore, by managing this parameter during training, we can develop specific and effective tables and correctly manage the training parameters.
Furthermore, by periodically checking performances thanks to aptitude tests that measure the time per kilometer in specific contexts, we have the confirmation or denial that our theoretical protocol is really working.
It may be important to take into account the time per kilometer even if the objective is to improve cardiovascular and respiratory function or the metabolic parameters of blood pressure, blood sugar and cholesterol.
If, however, the purposes are of another kind, the time per kilometer does not necessarily matter. For example, if we run for the pleasure of it, it doesn't matter; it is enough to enjoy the training in order to have good continuity in the long term.
Or, if we run to increase energy expenditure and promote weight loss, the time per kilometer becomes a meaningless parameter. What we should measure is the distance travelled, i.e. the training volume.
For the same mileage, going slower consumes less, but runs for longer. Conversely, by going faster you consume more, but you run for less time. The energy cost is, in the end, practically the same.
The hypothesis according to which by going slowly, in the famous intensity range called lipolytic, one can lose weight more effectively, must also be refuted. What matters is, in fact, the total cost of the activity.
Even if we consumed exclusively muscle glycogen, we would still obtain a huge advantage in managing dietary carbohydrates, with the result of increasing fat consumption at rest in the following hours.
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