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  • 1.
    Blomqvist, Sven
    et al.
    Swedish Development Centre for Disability Sport, Bollnäs, Sweden; Umeå universitet.
    Wester, Anita
    Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University, Umeå, Sweden.
    Rehn, Börje
    Department of Research and Evaluation, Swedish National Agency for Education, Stockholm, Sweden.
    Postural muscle responses and adaptations to backward platform perturbations in young people with and without intellectual disability2014Inngår i: Gait & Posture, ISSN 0966-6362, E-ISSN 1879-2219, Vol. 39, nr 3, s. 904-908Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study examines postural muscle responses to backward perturbations in young people (16-20 years) with and without intellectual disability (ID). The study included 56 young people with ID and 43 age-matched without ID volunteers. The subjects stood on a platform that was moved backwards in a surface translation. Lower and upper leg muscles and lower back spine muscles were recorded with surface electromyography (EMG). Muscle onset latency, time to peak amplitude (EMG), adaptation of muscle responses to repeated perturbations (using integrated EMG (IEMG) for epochs), and synergies and strategies were assessed. The result showed no differences between the two groups in muscle onset latency, synergies, and strategies. Young people with ID reduced their time to peak amplitude in investigated muscles, a response that was different from the group without ID. Also, young people with ID tended to adapt their IEMG less compared to the controls. These findings suggest that young people with ID have limited ability to use somatosensory information and adapt their postural muscle responses to repeated external perturbations.

  • 2.
    Stensdotter, Ann-Katrin
    et al.
    Umeå University, Umeå, Sweden; Sør-Trøndelag University College, Trondheim, Norway.
    Bjerke, Joakim
    Umeå University, Umeå, Sweden; Sør-Trøndelag University College, Trondheim, Norway.
    Djupsjöbacka, Mats
    Högskolan i Gävle, Akademin för hälsa och arbetsliv, Avdelningen för arbets- och folkhälsovetenskap, Arbetshälsovetenskap. Högskolan i Gävle, Centrum för belastningsskadeforskning.
    Postural sway in single-limb and bilateral quiet standing after unilateral total knee arthroplasty2015Inngår i: Gait & Posture, ISSN 0966-6362, E-ISSN 1879-2219, Vol. 41, nr 3, s. 769-773Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Aim: To investigate whether total knee arthroplasty (TKA) was associated with stability in single-limb stance and whether reduced stability in single-limb stance was associated with increased postural sway in bilateral quiet standing. Methods: 3D kinematics for center of mass was used to assess postural sway in 23 subjects with TKA and 23 controls. Tests included bilateral quiet standing with and without vision and on a compliant surface, and single-limb stance. Results: 30% of the subjects in the TKA group were unable to maintain single-limb stance for 20. s on any leg. Of the 70% in the TKA group able to stand on one leg, mean sway velocity in the medio-lateral direction was marginally higher for the prosthetic side (p = .02), but no differences were found between the TKA and the control group in single-limb stance. Performance in bilateral quiet standing was similar in TKA-subjects, able as well as unable to stand on one leg, and controls. Reduced quadriceps strength in the contralateral leg, higher BMI, and older age predicted failure to maintain single-limb stance. Conclusion: In subjects able to stand on one leg, performance was considered comparable between the prosthetic and contralateral side and between groups. Inability to stand on one leg did not affect postural sway in bilateral quiet standing. The results suggest that inability to maintain single-limb stance is explained by reduced physical capacity rather than the knee condition in itself. The present study emphasizes the importance of physical activity to improve strength and functional capacity.

  • 3. Stensdotter, Ann-Katrin
    et al.
    Lorås, Håvard W.
    Fløvig, John Christian
    Djupsjöbacka, Mats
    Högskolan i Gävle, Akademin för hälsa och arbetsliv, Avdelningen för arbets- och folkhälsovetenskap, Arbetshälsovetenskap. Högskolan i Gävle, Centrum för belastningsskadeforskning.
    Postural control in quiet standing in patients with psychotic disorders2013Inngår i: Gait & Posture, ISSN 0966-6362, E-ISSN 1879-2219, Vol. 38, nr 4, s. 918-922Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    There is evidence that patients with psychotic conditions display greater center of pressure (CoP) displacement during quite standing than healthy subjects, but the underlying impairments in the control mechanisms are uncertain. The aim of this study was to identify the nature of possible impairments in the control of posture by modulation of visual and kinesthetic information during quiet standing. Center of pressure (CoP) data and whole-body kinematics of the center of mass (CoM) were recorded during quite standing on a firm surface with eyes open and with eyes closed, and standing with eyes open on a yielding surface. During all three conditions, patients displayed greater migration of CoM and CoP-CoM, a measure related to ankle joint torque, whereas CoP-frequency (MPF) was similar in patients and healthy subjects. Our results suggested that greater postural sway in patients may depend on disproportionally large ankle joint torque without corresponding increase in frequency. Furthermore, interactions between groups and conditions suggested that the patients made less use of visual information for postural control than the healthy subjects.

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