Effect of wrist position on grip force sense in healthy adults

2020 ◽  
Vol 30 (4) ◽  
pp. 237-247
Author(s):  
Lin Li ◽  
Yan‐xia Li ◽  
Rui Gong ◽  
Hao Fu
Keyword(s):  
Grip Force ◽  
Healthy Adults ◽  
Wrist Position ◽  
Force Sense

Verbal Regulation of Grip Force in Preschoolers

2009 ◽  
Vol 108 (2) ◽  
pp. 540-548 ◽  
Author(s):  
Koichi Haishi ◽  
Ayumi Komatsu ◽  
Hideyuki Okuzumi ◽  
Mitsuru Kokubun ◽  
Yoshio Kitajima ◽  
...  
Keyword(s):  
Preschool Children ◽  
Young Children ◽  
Grip Force ◽  
Developmental Process ◽  
Healthy Adults ◽  
Developmental Changes ◽  
Typically Developing ◽  
Typically Developing Children ◽  
Preschool Period ◽  
Semantic Aspect

The purpose of this study was to clarify the developmental processes in verbal regulation by preschool children. Participants were 152 typically developing children (74 boys, 78 girls) between 4 and 6 years of age ( M = 5.3, SD =.8), and 30 healthy adults (15 men, 15 women) between 19 and 26 years of age ( M = 20.8, SD = 1.4). In Exp. 1, the task was to regulate grip force based on quantitative instruction which implies using a scale for regulation. Participants were required to produce a half-grip force of the maximum (Task 1). In Exp. 2, the task was grip-force regulation based on nonquantitative instruction. The participants were asked to respond with a slightly weaker grip force than the maximum (Task 2) and then a further weaker grip force (Task 3) than that used on Task 2. The regulation rates produced the extent of regulation and suggest regulation by quantitative instruction may develop earlier than by nonquantitative instruction. Also, precise grip-force regulation based on the semantic aspect of instruction may be difficult for young children. The developmental changes in the rate of performance especially observed in children of 4 to 6 years indicate that the tendency to use too much grip force disappears during this preschool period. In addition, too little grip force in regulation may reflect the developmental process toward fine grasping movements.

scholarly journals Median nerve travel and deformation in the transverse carpal tunnel increases with chuck grip force and deviated wrist position

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11038
Author(s):  
Kaylyn E. Turcotte ◽  
Aaron M. Kociolek
Keyword(s):  
Median Nerve ◽  
Carpal Tunnel ◽  
Grip Force ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Ulnar Deviation ◽  
Radial Deviation ◽  
Wrist Position ◽  
Anterior Posterior

Background We assessed median nerve travel and deformation concurrently to better understand the influence of occupational risk factors on carpal tunnel dynamics, including forceful chuck gripping and deviated wrist positions. Methods Fourteen healthy right-hand dominant participants performed a chuck grip in 6 experimental conditions: two relative force levels (10% and 40% of maximum voluntary effort); three wrist positions (15° radial deviation, 0° neutral, 30° ulnar deviation). Chuck grip forces were measured with a load cell while the transverse cross-section of the carpal tunnel was imaged via ultrasound at the distal wrist crease. Images of the median nerve were analyzed in ImageJ to assess cross-sectional area, circularity, width, and height as well as travel in the anterior-posterior and medial-lateral axes. Results We found a main effect of deviated wrist position on both anterior-posterior and medial-lateral travel, with the greatest nerve travel occurring in 30° ulnar deviation. There was also a significant interaction between chuck grip force and deviated wrist position on cross-sectional area. Specifically, the area decreased with 40% vs. 10% chuck grip force when the wrist was in 30° ulnar deviation; however, there were no changes in 0° neutral and 15° radial deviation. Discussion Overall, we demonstrated that forceful chuck gripping in deviated wrist positions influenced carpal tunnel dynamics, resulting in both migratory and morphological changes to the median nerve. These changes may, in turn, increase local strain and stress with adjacent structures in the carpal tunnel. Future studies mapping contact stress between structures may further elucidate injury development of work-related carpal tunnel syndrome.

The effect of lower leg sensory impulses on the force sense of knee extensor muscles in healthy adults: The accuracy of sense-of-force studies

2019 ◽  
Vol 23 (4) ◽  
pp. 739-745 ◽  
Author(s):  
B. Amirshakeri ◽  
M. Khalkhali Zavieh ◽  
A. Rezasoltani ◽  
K.H. Khademi Kalantari ◽  
A. Akbarzadeh
Keyword(s):  
Knee Extensor ◽  
Lower Leg ◽  
Healthy Adults ◽  
Extensor Muscles ◽  
Force Sense ◽  
Knee Extensor Muscles

scholarly journals Effects of grip force on median nerve deformation at different wrist angles

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2510 ◽  
Author(s):  
Ping Yeap Loh ◽  
Hiroki Nakashima ◽  
Satoshi Muraki
Keyword(s):  
Median Nerve ◽  
Carpal Tunnel ◽  
Grip Force ◽  
Sectional Area ◽  
Wrist Flexion ◽  
Cross Sectional ◽  
Wrist Extension ◽  
Wrist Position ◽  
Main Effects ◽  
Healthy Participants

The present study investigated the effects of grip on changes in the median nerve cross-sectional area (MNCSA) and median nerve diameter in the radial-ulnar direction (D1) and dorsal-palmar direction (D2) at three wrist angles. Twenty-nine healthy participants (19 men [mean age, 24.2 ± 1.6 years]; 10 women [mean age, 24.0 ± 1.6 years]) were recruited. The median nerve was examined at the proximal carpal tunnel region in three grip conditions, namely finger relaxation, unclenched fist, and clenched fist. Ultrasound examinations were performed in the neutral wrist position (0°), at 30°wrist flexion, and at 30°wrist extension for both wrists. The grip condition and wrist angle showed significant main effects (p< 0.01) on the changes in the MNCSA, D1, and D2. Furthermore, significant interactions (p< 0.01) were found between the grip condition and wrist angle for the MNCSA, D1, and D2. In the neutral wrist position (0°), significant reductions in the MNCSA, D1, and D2 were observed when finger relaxation changed to unclenched fist and clenched fist conditions. Clenched fist condition caused the highest deformations in the median nerve measurements (MNCSA, approximately −25%; D1, −13%; D2, −12%). The MNCSA was significantly lower at 30°wrist flexion and 30°wrist extension than in the neutral wrist position (0°) at unclenched fist and clenched fist conditions. Notably, clenched fist condition at 30°wrist flexion showed the highest reduction of the MNCSA (−29%). In addition, 30°wrist flexion resulted in a lower D1 at clenched fist condition. In contrast, 30°wrist extension resulted in a lower D2 at both unclenched fist and clenched fist conditions. Our results suggest that unclenched fist and clenched fist conditions cause reductions in the MNCSA, D1, and D2. More importantly, unclenched fist and clenched fist conditions at 30°wrist flexion and 30°wrist extension can lead to further deformation of the median nerve.

Influence of wrist position on maximum grip force in a post-operative orthosis

2016 ◽  
Vol 41 (1) ◽  
pp. 78-84 ◽  
Author(s):  
Arne Burssens ◽  
Nathalie Schelpe ◽  
Jeroen Vanhaecke ◽  
Marleen Dezillie ◽  
Filip Stockmans
Keyword(s):  
Grip Strength ◽  
Correlation Coefficient ◽  
Grip Force ◽  
Flexor Tendon ◽  
Tendon Repair ◽  
Flexion Angle ◽  
Flexor Tendon Repair ◽  
Wrist Position ◽  
Force Reduction ◽  
Maximum Grip

Background: Flexor tendon repair in the hand remains challenging in avoiding tendon rupture and adhesion formation. Post-operative mobilization has been shown to be critical in regaining functional range of motion. Objectives: The objective of this study is 2-fold: to assess the influence of wrist position on maximum grip force generated in a post-operative orthosis and to determine the correlation between this maximum grip force and an individual’s grip strength. Study design: Clinical measurement Methods: A total of 30 uninjured wrists of right-handed men were given a post-operative orthosis with an incorporated Caroli-hinge. The maximum grip force was measured according to a different wrist position ranging from −30° extension until 80° of flexion using a 10° interval. These measurements were plotted out on a graph for regression analysis. A correlation was determined between measurements in a neutral wrist position and maximum grip strength generated without an orthosis. To assess the coherence of the measurements, a mean intraclass correlation coefficient was used. Results: The maximum grip force values were statistically significantly different in every wrist position and decreased progressively with an increasing flexion angle ( p < 0.05). This relationship is expressed in a logistic regression curve f( x) = −4.98 + 16.92/(1 + (x/8.59))2.24. A wrist position of 4.4° of flexion was derived from this function to cause a maximum grip force reduction of 33%. Further analysis showed a force decrease of 50% at 23.2° and 66% at 51.8° of wrist flexion. The grip strength measured without an orthosis showed a positive correlation with previous measurements (Spearman’s correlation coefficient = 0.74 for the right hand and 0.72 for the left hand ( p < 0.001)). Conclusions: The obtained logistic function allowed to derive the wrist position needed in a post-operative orthosis to obtain a desired amount of maximum grip force reduction. Clinical relevance Measuring a high grip force in a clinical setting of flexor tendon repair on the contralateral non-affected hand could indicate the use of an increased flexion angle in a post-operative orthosis. This reduces the load transferred on the tendon repair when involuntary contractions take place, for example, during sleeping when positioned in a post-operative orthosis.

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