Dependence of Finger Flexion Force on the Posture of the Nonperforming Fingers During Key Pressing Tasks
作者:Zong-Ming Li、Guang H. Yue
DOI:10.1080/00222890209601951
日期:2002.12
The influence of different positions of the non-performing (idle) fingers on the maximal force contraction of flexion (master) fingers during key pressing tasks was investigated. Ten participants performed maximal voluntary flexion contractions with various combinations of the index, middle, ring, and little fingers while the idle fingers rested on or were lifted away from the supporting surface. The effect of idle finger posture on total finger force production of master fingers was dependent on finger combination. In general, force production by master fingers was higher when the idle fingers were lifted away from the supporting surface than when they rested on it. The average increase in total force production by master fingers caused by the lifting of idle fingers was +12.4% (from -8.3% to +30.2%). Force-production capability of individual master fingers can be facilitated (as high as 34.1%), unchanged, or depressed (as high as -29.0%) by lifting the idle fingers. The effect of idle finger posture on finger force production of master fingers led to changes in force deficit. Neural, anatomical, and mechanical factors might account for the dependence of finger flexion force of master fingers on the posture of the idle fingers.
DE855108
申请人:——
公开号:——
公开(公告)日:——
Beets; van Essen, Recueil des Travaux Chimiques des Pays-Bas, 1955, vol. 74, p. 98,108
作者:Beets、van Essen
DOI:——
日期:——
US4011273A
申请人:——
公开号:US4011273A
公开(公告)日:1977-03-08
Iridium-Catalyzed Reactions of ω-Arylalkanols to α,ω-Diarylalkanes
The long and the short of it: An atom‐economicalroute to α,ω‐diarylalkanes from ω‐arylalkanols was achieved by a direct one‐step method, or a sequential two‐step method depending on the alkyl chain length. The reaction proceeded through the formation of β‐methylhydroxy‐α,ω‐diarylalkanes by dehydrogenation/β‐alkylation, followed by dehydrogenation/decarbonylation.