Grip and load force control and coordination in object manipulation during a night of sleep deprivation

Author(s)

Pedao, Sabrina Tiago ^[1] ; Aguiar, Stefane Aline ^[1] ; Cunha, Bianca Pinto ^[1] ; de Freitas, Paulo Barbosa ^[1]

Affiliation

^[1] Univ Cruzeiro Sul, Inst Phys Act & Sport Sci, Grad Program Human Movement Sci, BR-01506000 Sao Paulo - Brazil

• Document type: Journal article
• Source: SLEEP AND BIOLOGICAL RHYTHMS; v. 13, n. 2, p. 163-171, APR 2015.
• Web of Science Citations: 2

Abstract

Although sleep deprivation causes deficits in the performance of several sensorimotor tasks, its effects on object manipulation are underexplored. To investigate the possible effects of sleep deprivation on the control of object manipulation we assessed the relationship between the force components acting on the digits-object interaction (i.e. grip force {[}GF] and load force {[}LF]) during two simple manipulation tasks. Sixteen young adults performed two manipulation tasks five times along one night of sleep deprivation, at 23:00, 01:00, 03:00, 05:00, and 07:00h. In the first task (i.e. holding), participants were asked to hold an instrumented object, as still as possible, during 12s. In the second task (i.e. shaking), they were instructed to continuously oscillate the object upward and downward at two frequencies, 0.8Hz and 1.2Hz. The results revealed that individuals who remained sleep deprived decreased linearly the amount of GF exerted while holding the object still as the night progressed. Also, results revealed that during the shaking task the GF-LF coordination and GF control were negatively affected at 03:00. These results indicate that during the holding task GF control is strongly affected by time awake and that during the shaking, a dynamic task, circadian variations play a major role. These changes could be detrimental to work-related manipulation tasks. (AU)

• FAPESP's process: 10/02939-4 - Hand function in neuropathic diabetic patients: control and coordination of forces acting on the digits-object interaction in manipulation tasks
• Grantee: Paulo Barbosa de Freitas Júnior
• Support type: Regular Research Grants
• FAPESP's process: 12/24426-4 - Hand function in post-stroke individuals: effect of lesion side
• Grantee: Bianca Pinto Cunha
• Support type: Scholarships in Brazil - Doctorate
• FAPESP's process: 11/16016-8 - Sleepness effects in the sensory-motor coupling in adults
• Grantee: Stefane Aline Aguiar
• Support type: Scholarships in Brazil - Master