Introduction
Methods
Eligibility criteria
Search strategy and study selection
Data extraction process
Synthesis of results
Study quality assessment
Results
Search results
Studies | Quality score | Adults | Older adults | Types of synergy | Synergy model | Task |
---|---|---|---|---|---|---|
Dutta et al (2013) | 6 | Male and female (n = 11) healthy adults (27 ± 11 years); right-handed | Male and female (n = 10) healthy adults (67 ± 5 years); right-handed | Multi-joint kinematic | UCM model included a 10 Dofs elemental variable (clavicle, shoulder, elbow and wrist) and one performance variable (hand position); VUCM, VORT and RVucm/Vort were reported | Reaching and aiming to a target on a touch screen; fast and accurate; no reaction time requirement; right/left hands under certain and uncertain target conditions; 120 trials per condition; only data from "dominant hand" and "certain the study |
Gorniak et al (2011) | 9 | Male and female (n = 13) healthy adults (23 ± 3 years); right-handed | Male and female (n = 9) healthy adults (78 ± 3 years); right-handed | Multi-finger force kinetic | UCM model included force variability among four fingers (elemental variable) to stablise a performance variable (grip force); ΔV was reported | Moving a handle to a visual target by applying fingers grip forces; subjects were instructed to move the handle quickly and accurately 0.30 m vertically to the visual target; 15 trials were completed |
9 | Male and female (n = 8) healthy adults (27.5 ± 3.7 years); right-handed | Male and female (n = 8) healthy adults (76.4 ± 2.5 years); right-handed | Multi-finger force kinetic | UCM model included force variability among four fingers (elemental variable) to stablise a performance variable (total force); VUCM, VORT and ΔV were reported | Finger pressing task in 4-fingers and 1-finger conditions; pressing the fingers in different directions (downward, backward, downward-left); online feedback from the force magnitude (MVC%); 15 trials in Four-finger pressing and 3 trials in 1-finger pressing; only data from "Four-finger pressing" and "force magnitude" were used in this study | |
Kruger et al. (2013) | 6 | Male and female (n = 11) healthy adults (25.5 ± 3.4 years); right-handed | Male and female (n = 11) healthy adults (66.3 ± 3.1 years); right-handed | Multi-joint Kinematic | UCM model included a 7Dofs elemental variable (shoulder, elbow and wrist) and one performance variable (hand position); VUCM, VORT and RVucm/Vort were reported | Reaching and grasping an object; fast and accurate; no reaction time requirement; target location was changed (L/R/M); 120 trials |
8 | Male and female (n = 12) healthy adults (26 ± 3 years); right-handed | Male and female (n = 12) healthy adults (77 ± 4 years); right-handed | Multi-finger force kinetic | UCM model included force variability among four fingers (elemental variable) to stablise a performance variable (total force); ΔV was reported | The subjects were asked to produce a ramp pattern of force from 0–25% of MVC over 5 s by pressing down with four fingers; young participants performed 25 trials and old participants performed 20 trials | |
8 | Male and female (n = 10) healthy adults (27 ± 4 years); right-handed | Male and female (n = 10) healthy adults (77 ± 4 years); right-handed | Multi-finger force kinetic | UCM model included force variability among four fingers (elemental variable) to stablise a performance variable (total force); ΔV was reported | The subjects were asked to produce a ramp pattern of force from 0–10% of MVC over 5 s by pressing down with four fingers under reaction time and self-paced conditions; young participants performed 15 trials and old participants performed 20 trials; only data from self-paced condition was used in this study | |
Park et al. (2011) | 8 | Male and female (n = 7) healthy adults (29.8 ± 2.27 years); right- handed | Male and female (n = 7) healthy adults (79.4 ± 4.31 years); right-handed | Multi-finger force kinetic | UCM model included force variability among four fingers (elemental variable) to stablise a performance variable (total force); VUCM, VORT and ΔV were reported | Participants were instructed to press down four fingers and produce a specific total force (MVC%); 20 trials were completed |
Park et al. (2016) | 6 | Male and female (n = 14) healthy adults (21.1 ± 1.3 years); right- handed | Male and female (n = 14) healthy adults (78.5 ± 4.63 years); right-handed | Multi-finger force kinetic | UCM model included force variability among two fingers (elemental variable) to stablise a performance variable (total force); VUCM, VORT and ΔV were reported | Participants were asked to produce a specific target force with 2 fingers under mechanical constraint and normal conditions; 10 trials per condition were completed; Only normal condition was used in this study |
Shim et al. (2004) | 8 | Male and female (n = 12) healthy adults (26.2 ± 2.8 years); right- handed | Male and female (n = 12) healthy adults (82.6 ± 5.3 years); right-handed | Multi-finger force kinetic | UCM model included force variability among four fingers (elemental variable) to stablise a performance variable (total force); VUCM, VORT and ΔV were reported | Participants were instructed to track a line by producing a specific force (20MVC%) by pressing four fingers within 6 s; 20 trials were completed |
Shinohara et al (2004) | 8 | Male and female (n = 12) healthy adults (28.9 ± 4.4 years); right-handed | Male and female (n = 12) healthy adults (82.1 ± 8 years); right-handed | Multi-finger force kinetic | UCM model included force variability among four fingers (elemental variable) to stablise a performance variable (total force); ΔV was reported | Participants were instructed to reach a target force (30 MVC%) with pressing four fingers; 12 trials were completed |
Singh et al (2013) | 6 | Male and female (n = 8) healthy adults (25.8 ± 3.3 years); right-handed | Male and female (n = 8) healthy adults (74.4 ± 4.5 years); right-handed | Multi-finger force kinetic | UCM model included force variability among four fingers (elemental variable) to stablise a performance variable (total force); VUCM, VORT and ΔV were reported | Participants were instructed to reach a target force (40MVC%) by pressing four fingers; 2 trials were completed |
Skm et al (2012) | 7 | Male and female (n = 9) healthy adults (27.3 ± 1.2 years); right- handed | Male and female (n = 9) healthy adults (77.6 ± 0.6 years); right-handed | Multi-finger force kinetic | UCM model included force variability among four fingers (elemental variable) to stablise a performance variable (total force); ΔV was reported | Participants were required to rotate a handle from neutral to a target position (30 degrees) in slow and fast speed; 24 trials were completed; Only fast speed condition was selected in this study |
Solnik et al. (2012) | 8 | Male and female (n = 8) healthy adults (25.7 ± 5.1 years); right- handed | Male and female (n = 8) healthy adults (77.1 ± 5.2 years); right-handed | Multi-finger force kinetic | UCM model included internal force variability among four fingers (elemental variable) to stablise a performance variable (total force); Normal force, Tangential foce and ratio were | Participants were given a handle to hold with finger tips in air and vertical to the floor for 3 s; different types of grip were used; 36 trials were completed |
Verrel et al. (2012) | 9 | Male and female (n = 12) healthy adults (25.5 ± 2.2 years); right- handed | Male and female (n = 12) healthy adults (73.4 ± 2 years); right-handed | Multi-joint kinematic | UCM model included a 11 Dofs elemental variable (clavicle, shoulder, elbow, wrist and fingers) and one performance variable (finger tip position); GEV , NGEV and UCM index were reported | Participants had to point targets with the right index finger; no reaction time requirement; targets were mounted on a stand (Up/Low); 3 practice conditions (blocked/alternating/random); 40 trials per condition were completed |
Wu et al. (2013) | 7 | Male and female (n = 16) healthy adults (26.9 ± 4.9 years); right- handed | Male and female (n = 10) healthy adults (76.1 ± 5.6 years); right-handed | Multi-finger force kinetic | UCM model included internal force variability among four fingers (elemental variable) to stablise a performance variable (total force); VUCM , VORT and ΔV were reported | Participants were instructed to reach a target force (40 MVC%) by pressing four fingers to match a target force template; 12 trials were completed |
Xu et al. (2013) | 8 | Female healthy (n = 9) adults (25.6 ± 3.9 years); right-handed | Female healthy (n = 9) adults (61.8 ± 4.5 years); right-handed | Multi-joint kinematic | UCM model included a 7 Dofs elemental variable (shoulder, elbow and wrist) and one performance variable (hand position); VUCM, VORT and ΔV were reported | A simulated assembly task was used that required reach, grasp and release movements; 4 sessions (20 min each) were completed |