The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform

A De Haan - One of the best experts on this subject based on the ideXlab platform.

  • Relative Torque contribution of vastus medialis muscle at different knee angles
    Acta Physiologica, 2008
    Co-Authors: C J De Ruiter, J G Hoddenbach, Arnold Huurnink, A De Haan
    Abstract:

    AIM: We investigated the Relative contribution of the vastus medialis (VM) muscle to total isometric knee extension Torque at 10 degrees , 30 degrees , 60 degrees and 90 degrees knee flexion. In the past a more prominent role of the VM muscle at more extended knee angles has been put forward. However, different components of the quadriceps muscle converge via a common distal tendon. We therefore hypothesized that the Relative contribution of the VM to total knee extension Torque would be similar across angles. METHODS: At each knee angle the EMG isometric Torque relations [20%, 25%, 30%, 35% maximal voluntary contraction (MVC)] of the rectus femoris (RF), vastus lateralis (VL) and VM muscle were established in 10 healthy male subjects; rectified surface EMG was normalized to M-wave area. Subsequently, the VM was functionally eliminated by selective electrical surface stimulation with occluded blood flow. RESULTS: There was no evidence for preferential activation of VM at any of the knee angles. Following VM elimination, total knee extension Torque during maximal femoral nerve stimulation (three pulses at 300 Hz) at 10 degrees , 30 degrees , 60 degrees and 90 degrees , respectively, decreased (P 0.05 among knee angles). In addition, during voluntary contractions at 20% MVC the increases in Torque output of RF and VL compensating for the loss of VM function were calculated from the increases in EMG and found to be similar (P > 0.05) at 10 degrees , 30 degrees , 60 degrees and 90 degrees values (%MVC), respectively, were: 9.1 +/- 6.8, 7.5 +/- 2.9, 5.9 +/- 3.7 and 6.9 +/- 3.4. CONCLUSION: The present findings support our hypothesis that the VM contributes similarly to total knee extension Torque at different knee angles.

Natalie E. Monaco - One of the best experts on this subject based on the ideXlab platform.

  • Measurement of Clinicians' Ability to Hand Torque Dental Implant Components
    Journal of Oral Implantology, 2009
    Co-Authors: Ali Kanawati, Mark W. Richards, Jeffery J. Becker, Natalie E. Monaco
    Abstract:

    Abstract There is a varying degree of hand Torque abilities using finger drivers among clinicians. Calibrating one's own abilities requires complicated instruments not readily available. This study evaluated a simple-to-use method that allows dental practitioners to have a quantifiable clinical assessment of Relative Torque ability using finger drivers to Torque down dental implant components. A typodont that includes dental implants was mounted in a mannequin placed in a patient-reclined position. The subjects were asked to Torque as tightly as they could a new healing abutment to an implant secured firmly in resin within the typodont. All participants wore moistened gloves when using a finger driver. The healing abutment was counterTorqued using a certified precalibrated precision Torque measurement device. The reading on the Torque driver was recorded when the healing abutment disengaged. An average of Torque values of dentists and dental students was calculated. Fifty subjects had an average maximum t...

  • Measurement of Clinicians' Ability to Hand Torque Dental Implant Components
    Journal of Oral Implantology, 2009
    Co-Authors: Ali Kanawati, Mark W. Richards, Jeffery J. Becker, Natalie E. Monaco
    Abstract:

    There is a varying degree of hand Torque abilities using finger drivers among clinicians. Calibrating one's own abilities requires complicated instruments not readily available. This study evaluated a simple-to-use method that allows dental practitioners to have a quantifiable clinical assessment of Relative Torque ability using finger drivers to Torque down dental implant components. A typodont that includes dental implants was mounted in a mannequin placed in a patient-reclined position. The subjects were asked to Torque as tightly as they could a new healing abutment to an implant secured firmly in resin within the typodont. All participants wore moistened gloves when using a finger driver. The healing abutment was counterTorqued using a certified precalibrated precision Torque measurement device. The reading on the Torque driver was recorded when the healing abutment disengaged. An average of Torque values of dentists and dental students was calculated. Fifty subjects had an average maximum Torque ability of 24 Ncm (male dentists: 28 Ncm; students: 22 Ncm; male students: 24 Ncm; female students: 19 Ncm). Maximum Torque values for all participants ranged from 11 Ncm to 38 Ncm. There was no significant difference between groups. This study showed a varying degree of hand torquing abilities using a finger driver. Clinicians should regularly calibrate their ability to Torque implant components to more predictably perform implant dentistry. Dental implant manufacturers should more precisely instruct clinicians as to maximum Torque, as opposed to "finger tighten only".

P. V. Komi - One of the best experts on this subject based on the ideXlab platform.

  • Changes in the soleus muscle architecture after exhausting stretch-shortening cycle exercise in humans.
    Arbeitsphysiologie, 2006
    Co-Authors: M. Ishikawa, E. Dousset, J. Avela, H. Kyröläinen, J. Kallio, V. Linnamo, S. Kuitunen, C. Nicol, P. V. Komi
    Abstract:

    This study focused on the architectural changes in the muscle-tendon complex during the immediate and secondary (delayed) reductions of performance (bimodal recovery) caused by an exhaustive rebound type stretch-shortening cycle (SSC) exercise. The isometric plantar flexor Torque during maximum voluntary contraction (MVC) was measured together with recording of electromyography (EMG) and ultrasonography from the soleus muscle before (BEF), after (AFT), 2 h (2H), 2 and 8 days (2D, 8D) after the SSC exercise (n=8). The performance variables (MVC Torque and EMG activation) followed the bimodal recovery patterns. This was not the case in the changes of the fascicle length and muscle thickness. The Relative Torque changes in MVC correlated positively (R=0.78, P=0.02) to the corresponding averaged EMG changes between BEF and 2H (BEF-->2H); the significance disappeared in the comparison between 2H and 2D (2H-->2D), during which period MVC showed a secondary reduction. The Relative Torque changes in MVC showed no correlation with the changes in muscle thickness between BEF-2H. However, this correlation between 2H-2D was negative (R=-0.85, P

  • Changes in the soleus muscle architecture after exhausting stretch-shortening cycle exercise in humans
    European Journal of Applied Physiology, 2006
    Co-Authors: M. Ishikawa, E. Dousset, J. Avela, H. Kyröläinen, J. Kallio, V. Linnamo, S. Kuitunen, C. Nicol, P. V. Komi
    Abstract:

    This study focused on the architectural changes in the muscle–tendon complex during the immediate and secondary (delayed) reductions of performance (bimodal recovery) caused by an exhaustive rebound type stretch-shortening cycle (SSC) exercise. The isometric plantar flexor Torque during maximum voluntary contraction (MVC) was measured together with recording of electromyography (EMG) and ultrasonography from the soleus muscle before (BEF), after (AFT), 2 h (2H), 2 and 8 days (2D, 8D) after the SSC exercise (n = 8). The performance variables (MVC Torque and EMG activation) followed the bimodal recovery patterns. This was not the case in the changes of the fascicle length and muscle thickness. The Relative Torque changes in MVC correlated positively (R = 0.78, P = 0.02) to the corresponding averaged EMG changes between BEF and 2H (BEF → 2H); the significance disappeared in the comparison between 2H and 2D (2H → 2D), during which period MVC showed a secondary reduction. The Relative Torque changes in MVC showed no correlation with the changes in muscle thickness between BEF–2H. However, this correlation between 2H–2D was negative (R = –0.85, P < 0.01). The fascicle shortening/average EMG ratio in MVC increased at 2H, and then decreased more at 2D than 2H (P < 0.05). Thus, the secondary performance decline was not related to the corresponding EMG reduction but to the increased muscle thickness, which peaked at 2D. The results suggest clearly that the secondary decline in MVC could be related to the increase in muscle volume.

C J De Ruiter - One of the best experts on this subject based on the ideXlab platform.

  • Relative Torque contribution of vastus medialis muscle at different knee angles
    Acta Physiologica, 2008
    Co-Authors: C J De Ruiter, J G Hoddenbach, Arnold Huurnink, A De Haan
    Abstract:

    AIM: We investigated the Relative contribution of the vastus medialis (VM) muscle to total isometric knee extension Torque at 10 degrees , 30 degrees , 60 degrees and 90 degrees knee flexion. In the past a more prominent role of the VM muscle at more extended knee angles has been put forward. However, different components of the quadriceps muscle converge via a common distal tendon. We therefore hypothesized that the Relative contribution of the VM to total knee extension Torque would be similar across angles. METHODS: At each knee angle the EMG isometric Torque relations [20%, 25%, 30%, 35% maximal voluntary contraction (MVC)] of the rectus femoris (RF), vastus lateralis (VL) and VM muscle were established in 10 healthy male subjects; rectified surface EMG was normalized to M-wave area. Subsequently, the VM was functionally eliminated by selective electrical surface stimulation with occluded blood flow. RESULTS: There was no evidence for preferential activation of VM at any of the knee angles. Following VM elimination, total knee extension Torque during maximal femoral nerve stimulation (three pulses at 300 Hz) at 10 degrees , 30 degrees , 60 degrees and 90 degrees , respectively, decreased (P 0.05 among knee angles). In addition, during voluntary contractions at 20% MVC the increases in Torque output of RF and VL compensating for the loss of VM function were calculated from the increases in EMG and found to be similar (P > 0.05) at 10 degrees , 30 degrees , 60 degrees and 90 degrees values (%MVC), respectively, were: 9.1 +/- 6.8, 7.5 +/- 2.9, 5.9 +/- 3.7 and 6.9 +/- 3.4. CONCLUSION: The present findings support our hypothesis that the VM contributes similarly to total knee extension Torque at different knee angles.

Ali Kanawati - One of the best experts on this subject based on the ideXlab platform.

  • Measurement of Clinicians' Ability to Hand Torque Dental Implant Components
    Journal of Oral Implantology, 2009
    Co-Authors: Ali Kanawati, Mark W. Richards, Jeffery J. Becker, Natalie E. Monaco
    Abstract:

    Abstract There is a varying degree of hand Torque abilities using finger drivers among clinicians. Calibrating one's own abilities requires complicated instruments not readily available. This study evaluated a simple-to-use method that allows dental practitioners to have a quantifiable clinical assessment of Relative Torque ability using finger drivers to Torque down dental implant components. A typodont that includes dental implants was mounted in a mannequin placed in a patient-reclined position. The subjects were asked to Torque as tightly as they could a new healing abutment to an implant secured firmly in resin within the typodont. All participants wore moistened gloves when using a finger driver. The healing abutment was counterTorqued using a certified precalibrated precision Torque measurement device. The reading on the Torque driver was recorded when the healing abutment disengaged. An average of Torque values of dentists and dental students was calculated. Fifty subjects had an average maximum t...

  • Measurement of Clinicians' Ability to Hand Torque Dental Implant Components
    Journal of Oral Implantology, 2009
    Co-Authors: Ali Kanawati, Mark W. Richards, Jeffery J. Becker, Natalie E. Monaco
    Abstract:

    There is a varying degree of hand Torque abilities using finger drivers among clinicians. Calibrating one's own abilities requires complicated instruments not readily available. This study evaluated a simple-to-use method that allows dental practitioners to have a quantifiable clinical assessment of Relative Torque ability using finger drivers to Torque down dental implant components. A typodont that includes dental implants was mounted in a mannequin placed in a patient-reclined position. The subjects were asked to Torque as tightly as they could a new healing abutment to an implant secured firmly in resin within the typodont. All participants wore moistened gloves when using a finger driver. The healing abutment was counterTorqued using a certified precalibrated precision Torque measurement device. The reading on the Torque driver was recorded when the healing abutment disengaged. An average of Torque values of dentists and dental students was calculated. Fifty subjects had an average maximum Torque ability of 24 Ncm (male dentists: 28 Ncm; students: 22 Ncm; male students: 24 Ncm; female students: 19 Ncm). Maximum Torque values for all participants ranged from 11 Ncm to 38 Ncm. There was no significant difference between groups. This study showed a varying degree of hand torquing abilities using a finger driver. Clinicians should regularly calibrate their ability to Torque implant components to more predictably perform implant dentistry. Dental implant manufacturers should more precisely instruct clinicians as to maximum Torque, as opposed to "finger tighten only".