Eight male athletes participated in a study of fatigue with the purpose of investigating the effect, acute fatigue in the muscles of the medial longitudinal arch has on jump height. The participants performed a control experiment with no fatigue, and an intervention where they were fatigued in the muscles of the medial longitudinal arch by performing a short foot fatiguing exercise. Maximal voluntary isometric contractions of five seconds were used as a measurement of fatigue with the help of a force platform. A Pre and post measurement of maximal vertical jump height was performed, using the impulse method. We hypothesized that fatigue in the muscles of the medial longitudinal arch would reduce jump height. According to the maximal voluntary isometric contraction measurements, fatigue was only significant in the intervention (p = 0.0002) and a students paired t-test (p = 0.53) indicated no significant difference in vertical jump height from pre to post fatigue.