Alongside the magnitude of force, the study examines its distribution across both body sides. This second variable is less visible but decisive for loading and wear.
What counts as the optimum?
The optimum is reached when both feet apply an identical amount of force — a 50/50 distribution. Figure 2 shows for each measurement how far the actual distribution deviates from this ideal. Values close to the zero line mean a balanced ratio; large excursions in either direction mean an imbalance in favour of one side.
- without insole
- with Winsole
The result
Across the 9 measurements the deviation without an insole averages 7.4 N. With Winsole insoles the deviations are 1 N lower. The larger excursions occur in the measurements using the standard insoles.
The study concludes that an approximation to the ideal distribution can be achieved when using the Winsole insoles.
Why symmetry matters
Uneven loading regularly leads to an increased risk of injury and to long-term wear.
In its conclusion the study states that a loss of performance caused by asymmetric power transfer could be minimised and compensated.