TY - JOUR
T1 - The reachable 3-D workspace volume is a measure of payload and body-mass-index
T2 - A quasi-static kinetic assessment
AU - Castro, Miguel Nobre
AU - Rasmussen, John
AU - Bai, Shaoping
AU - Andersen, Michael Skipper
PY - 2019/2
Y1 - 2019/2
N2 - An experimental protocol with five tasks is proposed for a low-cost empirical assessment of the reachable 3-D workspace (RWS), including both close-to-torso and far-from-torso regions. Ten participants repeated the protocol for four distinct hand payloads. The RWS expressed as a point cloud and its non-convex alpha-shape were obtained for each case. Moreover, individual strength surrogates for glenohumeral flexion and abduction, and elbow flexion were collected using a dynamometer. The RWS volume was statistically modelled using payload, body-mass-index and the strength surrogates as predictors. For increasing payload, a significant (r = −0.736,p < 0.001) decrease in RWS volume was found for distinct payload cases across all subjects. The only significant predictors found for the RWS volume were normalized payload (F = 73.740,p < 0.001) and body-mass-index (F = 11.008,p = 0.003). No significant interactions were found. The consequent regression model (F(2,27) = 41.11, p < 0.001, R
adj
2 = 0.7345) explained around 73% of the variation in the data. The RWS volume is a function of payload and body-mass-index.
AB - An experimental protocol with five tasks is proposed for a low-cost empirical assessment of the reachable 3-D workspace (RWS), including both close-to-torso and far-from-torso regions. Ten participants repeated the protocol for four distinct hand payloads. The RWS expressed as a point cloud and its non-convex alpha-shape were obtained for each case. Moreover, individual strength surrogates for glenohumeral flexion and abduction, and elbow flexion were collected using a dynamometer. The RWS volume was statistically modelled using payload, body-mass-index and the strength surrogates as predictors. For increasing payload, a significant (r = −0.736,p < 0.001) decrease in RWS volume was found for distinct payload cases across all subjects. The only significant predictors found for the RWS volume were normalized payload (F = 73.740,p < 0.001) and body-mass-index (F = 11.008,p = 0.003). No significant interactions were found. The consequent regression model (F(2,27) = 41.11, p < 0.001, R
adj
2 = 0.7345) explained around 73% of the variation in the data. The RWS volume is a function of payload and body-mass-index.
KW - Reachable workspace
KW - Statistical modelling
KW - Strength measurements
KW - Upper extremity kinematics
UR - http://www.scopus.com/inward/record.url?scp=85053930721&partnerID=8YFLogxK
U2 - 10.1016/j.apergo.2018.09.010
DO - 10.1016/j.apergo.2018.09.010
M3 - Journal article
SN - 0003-6870
VL - 75
SP - 108
EP - 119
JO - Applied Ergonomics
JF - Applied Ergonomics
IS - C
ER -