To combine measurement methods of biophysical skin properties in a clinical setting and to measur... more To combine measurement methods of biophysical skin properties in a clinical setting and to measure baseline values in the unloaded sacral region of healthy persons after lying 30 min in supine position. Hydration (Corneometer® CM 825), redness (Mexameter® MX 18), elasticity (Cutometer® MPA 580) and perfusion (PeriFlux System 5000) of the skin in the sacral region of 10 healthy participants (median age: 26.9 years) were measured consecutively in the laying position by two trained examiners. The assessment duration for all four parameters lasted about 15 min. Intra-class correlation coefficients were overall moderate to strong (hydration r = 0.594, redness r = 0.817, elasticity r = 0.719, perfusion r = 0.591). Hydration (median 27.7 arbitrary units (AU)) mainly indicated dry skin conditions. Redness (median 158.5 AU) was low. Elasticity (median 0.880 AU) showed similar values as in the neck region. Perfusion (median 17.1 AU) showed values in the range of results reported in the litera...
Decubitus ulcers or pressure ulcers are a major health problem. This study investigated the possi... more Decubitus ulcers or pressure ulcers are a major health problem. This study investigated the possibility of using low-friction bed sheets with optimized moisture transport properties for the prevention of decubitus ulcers. The tribological behavior of a newly developed prototype in contact with human skin was investigated in vivo. For comparison conventional hospital bed sheets were also investigated.
ABSTRACT Decubitus or pressure ulcers in immobile patients are associated with prolonged pressure... more ABSTRACT Decubitus or pressure ulcers in immobile patients are associated with prolonged pressure, shear and friction forces acting on the skin and the soft tissue underneath. We investigated the friction behaviour of hospital bed sheets in comparison with prototypes of low friction textiles in order to assess their potential for decubitus prevention. A specific textile composed of synthetic fibres showed a factor of three lower friction than normal hospital bed sheets under both dry and wet conditions. By absorbing and distributing interfacial water within the textile structure, the prototype additionally exhibited beneficial water transport properties.Highlights► The friction behaviour of a novel prototype of a hospital bed sheet was investigated. ► Low friction was found in contact conditions that are relevant for immobile patients. ► The distribution of interfacial water during friction was measured using thermography. ► Efficient water transport within the textile limited the influence on friction. ► The prototype performed better than normal bed sheets under dry and wet conditions.
To evaluate the effect of the spatial orientation of the crank axis on mechanical efficiency, phy... more To evaluate the effect of the spatial orientation of the crank axis on mechanical efficiency, physiological strain and perceived discomfort in submaximal synchronous arm crank ergometry. Twelve able-bodied individuals performed 12 submaximal exercise bouts of 3 minutes (women: 20 W/25 W; men: 25 W/35 W). The crank axis position was defined by elbow and shoulder angle. The results showed that a crank set-up with an elbow angle of 30 degrees was more efficient than 15 degrees ; oxygen consumption and minute ventilation were significantly lower. No significant effects were seen for shoulder angle. Power output and gender showed obvious effects. The magnitude of this effect and the absence of any significant shoulder angle effects may be due to the relative low exertion levels that were evaluated. An elbow angle of 30 degrees flexion in arm crank exercise is favourable compared to an elbow angle of 15 degrees in able-bodied untrained subjects.
Archives of Physical Medicine and Rehabilitation, 2005
Wirz M, Zemon DH, Rupp R, Scheel A, Colombo G, Dietz V, Hornby TG. Effectiveness of automated loc... more Wirz M, Zemon DH, Rupp R, Scheel A, Colombo G, Dietz V, Hornby TG. Effectiveness of automated locomotor training in patients with chronic incomplete spinal cord injury: a multicenter trial. Arch Phys Med Rehabil 2005; 86:672-80.
To combine measurement methods of biophysical skin properties in a clinical setting and to measur... more To combine measurement methods of biophysical skin properties in a clinical setting and to measure baseline values in the unloaded sacral region of healthy persons after lying 30 min in supine position. Hydration (Corneometer® CM 825), redness (Mexameter® MX 18), elasticity (Cutometer® MPA 580) and perfusion (PeriFlux System 5000) of the skin in the sacral region of 10 healthy participants (median age: 26.9 years) were measured consecutively in the laying position by two trained examiners. The assessment duration for all four parameters lasted about 15 min. Intra-class correlation coefficients were overall moderate to strong (hydration r = 0.594, redness r = 0.817, elasticity r = 0.719, perfusion r = 0.591). Hydration (median 27.7 arbitrary units (AU)) mainly indicated dry skin conditions. Redness (median 158.5 AU) was low. Elasticity (median 0.880 AU) showed similar values as in the neck region. Perfusion (median 17.1 AU) showed values in the range of results reported in the litera...
Decubitus ulcers or pressure ulcers are a major health problem. This study investigated the possi... more Decubitus ulcers or pressure ulcers are a major health problem. This study investigated the possibility of using low-friction bed sheets with optimized moisture transport properties for the prevention of decubitus ulcers. The tribological behavior of a newly developed prototype in contact with human skin was investigated in vivo. For comparison conventional hospital bed sheets were also investigated.
ABSTRACT Decubitus or pressure ulcers in immobile patients are associated with prolonged pressure... more ABSTRACT Decubitus or pressure ulcers in immobile patients are associated with prolonged pressure, shear and friction forces acting on the skin and the soft tissue underneath. We investigated the friction behaviour of hospital bed sheets in comparison with prototypes of low friction textiles in order to assess their potential for decubitus prevention. A specific textile composed of synthetic fibres showed a factor of three lower friction than normal hospital bed sheets under both dry and wet conditions. By absorbing and distributing interfacial water within the textile structure, the prototype additionally exhibited beneficial water transport properties.Highlights► The friction behaviour of a novel prototype of a hospital bed sheet was investigated. ► Low friction was found in contact conditions that are relevant for immobile patients. ► The distribution of interfacial water during friction was measured using thermography. ► Efficient water transport within the textile limited the influence on friction. ► The prototype performed better than normal bed sheets under dry and wet conditions.
To evaluate the effect of the spatial orientation of the crank axis on mechanical efficiency, phy... more To evaluate the effect of the spatial orientation of the crank axis on mechanical efficiency, physiological strain and perceived discomfort in submaximal synchronous arm crank ergometry. Twelve able-bodied individuals performed 12 submaximal exercise bouts of 3 minutes (women: 20 W/25 W; men: 25 W/35 W). The crank axis position was defined by elbow and shoulder angle. The results showed that a crank set-up with an elbow angle of 30 degrees was more efficient than 15 degrees ; oxygen consumption and minute ventilation were significantly lower. No significant effects were seen for shoulder angle. Power output and gender showed obvious effects. The magnitude of this effect and the absence of any significant shoulder angle effects may be due to the relative low exertion levels that were evaluated. An elbow angle of 30 degrees flexion in arm crank exercise is favourable compared to an elbow angle of 15 degrees in able-bodied untrained subjects.
Archives of Physical Medicine and Rehabilitation, 2005
Wirz M, Zemon DH, Rupp R, Scheel A, Colombo G, Dietz V, Hornby TG. Effectiveness of automated loc... more Wirz M, Zemon DH, Rupp R, Scheel A, Colombo G, Dietz V, Hornby TG. Effectiveness of automated locomotor training in patients with chronic incomplete spinal cord injury: a multicenter trial. Arch Phys Med Rehabil 2005; 86:672-80.
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