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. 2014 Apr 28;6:79. doi: 10.3389/fnagi.2014.00079

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Copyright © 2014 Wolkorte, Kamphuis and Zijdewind.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Submaximal force (A), maximal force (B), standard deviation of the submaximal force (C) and EMG during the submaximal force task (D) during the 10 and 30%-dual-task. Means are calculated for the first and second half of the task. Black circles represent middle-aged subjects, red squares represent young subjects. Solid lines for 30%-dual-task, dashed lines for 10%-dual-task. Error bars represent SE. * Shows main effects, # shows interaction effects. Signs of fatigue in the second half of the dual task are clearly visible for the 30%-dual-task (i.e., decline in MVC, increase in the standard deviation of the submaximal force associated with an increase in EMG).