Moment Arms with Respect to Flexio/Extensio Axis of Rotation in Elbow Joint
 dBRD = 2.015-0.458*a+3.058*a2 -1.081*a3+0.159*a4-0.0187*a5
 dBIC = 1.963-1.44*a+3.031*a2+0.887*a3-1.418*a4+0.285*a5
 dBRA = 1.554+0.0813*a-1.689*a2+3.523*a3-1.811*a4+0.276*a5
 dECRL = 1.195+0.17*a-1.318*a2+2.49*a3-1.207*a4+0.177*a5
 dPRO = 0.682 -0.459*a+1.266*a2 -0.356*a3 -0.149*a4+0.0468*a5
 dFCR = 0.0987+0.415*a -0.446*a2+0.343*a3 -0.145*a4+0.0212*a5
 dEDI = 0.0827 -0.101*a -0.101*a2+0.0129*a3+0.0298*a4-0.0069*a5
 dECRB = 0.0463 -0.281*a+0.182*a2 -0.114*a3+0.0474*a4-0.0072*a5
 dFDS = -0.405 -0.357*a+1.084*a2 -0.91*a3+0.303*a4-0.0356*a5
 dECU = -0.245 -0.898*a+0.395*a2 -0.251*a3+0.179*a4-0.0346*a5
 dANC = -0.5345-0.22841*10-1*b+0.84297*10-3*b2
-1.4329*10-5*b3+1.0448*10-7*b4-0.27306*10-9*b5
 dTRI = -2.365-1.015*a+1.92*a2-1.035*a3+0.257*a4 -0.0262*a5
ARMS1
Moment Arms with Respect to Pronato/Supenato Axis of Rotation in Elbow Joint
 dBRD = 1.2-11*10-5*(90-b)+47*10-6(90-b)2+11*10-7*(90-b)3
-23*10-9*(90-b)4+88*10-12*(90-b)5
 dBIC = 9+13*10-3*(90-b)-59*10-5*(90-b)2+91*10-7*(90-b)3
-53*10-9*(90-b)4+10*10-11*(90-b)5
 dBRb = 0.65-30*10-4*(90-b)-66*10-5*(90-b)2+22*10-8*(90-b)3
 dECRL = -0.72-11*10-3*(90-b)+15*10-5*(90-b)2-47*10-8*(90-b)3
 dPRO= -2+31*10-4*(90-b)-64*10-6(90-b)2
ARMS2
Moment Arms with Respect to Flexio/Extensio Axis of Rotation in Wrist Joint
 dPLO = 2.17 +0.91*a -0.31*a2 -0.26*a3 +0.07*a4 +0.04*a5
 dFPL = 1.513 +0.971*a + 0.442*a2 - 0.523*a3 -0.179*a4 +0.164*a5
 dFDS = 1.48 + 1.149*a +0.31*a2 -0.86*a3 -0.15*a4 +0.25*a5
 dFDP = 1.31 +0.97*a +0.41*a2 -0.72*a3 -0.19*a4 +0.23*a5
 dECRB = -1.37 +0.18*a +0.21*a2 -0.11*a3 -0.08*a4 +0.04*a5
 dFCR = 1.77 -0.081*a -0.24*a2 +0.05*a3 +0.07*a4 -0.02*a5
 dAPL =0.7 +0.39*a +0.008*a2 -0.14*a3 -0.03*a4 -0.04*a5
 dEPB =0.35 +0.09*a +0.05*a2 -0.07*a3 -0.02*a4 +0.02*a5
 dECRL = -1.02 +0.31*a +0.12*a2 -0.12*a3 -0.03*a4 +0.03*a5
 dECU = -0.57 +0.28*a +0.04*a2 -0.14*a3 -0.02*a4 +0.03*a5
 dEPL = -0.75 -0.039*a +0.043*a2 +0.003*a3 -0.01*a4
 dFCU = 1.9 +0.14*a -0.55*a2 +0.2*a3 +0.22*a4 -0.12*a5
 dEDI = -1.37 +0.18*a +0.21*a2 -0.11*a3 -0.08*a4 +0.04*a5
ARMS3
Moment Arms with Respect to Abductio/Adductio Axis of Rotation in Wrist Joint
 dEPB = 2.35 +0.78*a - 3.33*a2 +0.25*a3
 dECRL = 2.1 +0.97*a - 1.22*a2 +0.41*a3
 dAPL = 2.28 +0.2*a -0.14*a2 -0.43*a3
 dECRB =1.17 +- 1.23*a - 1.22*a2 -0.41*a3
 dFCR =0.97 +0.8*a -0.06*a2 -0.55*a3
 dEPL =0.96 +0.62*a +0.96*a2 - 1.89*a3
 dFPL =0.54 -0.16*a -0.066*a2 +0.14*a3
 dPLO =0.21 -0.36*a -0.98*a2 + 1.6*a3
 dFDS = -0.2 -0.65*a +0.15*a2 +0.31*a3
 dFDP = -0.16 -0.89*a - 1.12*a2 + 2.51*a3
 dEDI = 0.34 +0.07*a + 0.52*a2 -0.78*a3
 dFCU = -1.61 +0.74*a +0.11*a2 -0.45*a3
 dECU = -2.49 -0.02*a +0.023*a2 -0.86*a3
ARMS4
where "a" is joint angle in radianed and "b" is joint angle degrees

Data Sources
dBRD, dBIC, dBRA, dECRL, dPRO, dFCR, dEDI, dECRB, dFDS, dECU, dTRI Lemay M.A., Crago, P.E. (1996) A dynamic model for simulating movements of the elbow, forearm, and wrist. J.Biomechanics, 29, 1319-1330
dANC Pigeon ,P., Yahia L.H., Feldman A.G. (1996) Moment arms and lengths of human upper limb muscles as functions of joint angles. Journal of Biomechanics, 29, 1365-1370