Yazar "Stoffregen, Thomas A." seçeneğine göre listele

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    Dynamic perception of dynamic affordances: walking on a ship at sea
    (SPRINGER, 2017) Walter, Hannah; Wagman, Jeffrey B.; Stergiou, Nick; Erkmen, Nurtekin; Stoffregen, Thomas A.
    Motion of the surface of the sea (waves, and swell) causes oscillatory motion of ships at sea. Generally, ships are longer than they are wide. One consequence of this structural difference is that oscillatory ship motion typically will be greater in roll (i.e., the ship rolling from side to side) than in pitch (i.e., the bow and stern rising and falling). For persons on ships at sea, affordances for walking on the open deck should be differentially influenced by ship motion in roll and pitch. Specifically, the minimum width of a walkable path should be greater when walking along the ship's short, or athwart axis than when walking along its long, or fore-aft axis. On a ship at sea, we evaluated the effects of walking in different directions (fore-aft vs. athwart) on actual walking performance. We did this by laying out narrow paths on the deck and asking participants (experienced maritime crewmembers) to walk as far as they could while remaining within the lateral path boundaries. As predicted, participants walked farther along the athwart path than along the fore-aft path. Before actual walking, we evaluated participants' judgments of their walking ability in the fore-aft and athwart directions. These judgments mirrored the observed differences in walking performance, and the accuracy of judgments did not differ between the two directions. We conclude that experienced maritime crewmembers were sensitive to affordances for walking in which the relevant properties of the environment were exclusively dynamic.
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    Qualitative assessment of balance performance among judo players with visual impairment
    (STOWARZYSZENIE IDOKAN POLSKA-IDOKAN POLAND ASSOC, 2017) Tukel, Yalcin; Sanioglu, Ahmet; Taskin, Halil; Stoffregen, Thomas A.; Erkmen, Nurtekin
    Background. Visual impairment is associated with decrements in the control of standing postural balance. At the same time, skill in many sports is associated with increased balance skills. Aim. The study hypothesized that athletes with visual impairment would have better balance performance than non-athletes with visual impairment. Methods. To evaluate this hypothesis the postural balance of highly experienced judo players were investigated. Standing postural balance was evaluated in three groups of male participants: judo players with visual impairment, non-athletes with visual impairment, and sighted non-athletes. Balance performance was measured by the Balance Error Scoring System during stance on a firm surface, and during stance on a foam surface. Results. Balance errors were more common during stance on the foam surface, confirming previous findings. No significant difference was found in balance performance between the different participant groups (p > 0.05). Conclusion. The study discusses the results in relation to the existing literature, and in terms of the sensitivity of different types of balance assessment. It will be important to include measures of the quantitative kinematics of body sway to better understand the effects of sports training and skill on the postural control of persons with visual impairment.