Figure 1. A) Representative fatiguing exercise ground reaction force in multiples of body weight (which is the same as acceleration in multiples of gravitational acceleration) from one subject. B) The corresponding amplitudes of frequency components obtained with fast Fourier transformation from the representative ground reaction force curve. C) Osteogenic potential components of frequency components of the representative ground reaction force curve. Frequency content up to 50 Hz was included in the osteogenic index calculations.