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Table 5 Geometric conditional angles \(\beta _i\) and \(\gamma _i\) for each muscular arrangement

From: Geometric conditions of a two-link-and-six muscle structure based on internal force stability

 Simple-joint musclesBiarticular muscles
A
   Conditions [deg]\(\beta _{1...4}>90\) or \(\gamma _{1...4}>90\)\(\beta _{5, 6}>90\) and \(\gamma _{5, 6}>90\)
   \(\beta _{1...6}\) [deg]95.1, 95.1, 95.1, 95.1120.0, 120.0
   \(\gamma _{1...6}\) [deg]29.9, 29.9, 29.9, 29.9120.0, 120.0
B
   Conditions [deg]\(\beta _{1...4}>90\) or \(\gamma _{1...4}>90\)\(\beta _{5, 6}>90\) and \(\gamma _{5, 6}>90\)
   \(\beta _{1...6}\) [deg]67.5, 67.5, 67.5, 67.590.0, 90.0
   \(\gamma _{1...6}\) [deg]27.5, 27.5, 27.5, 27.590.0, 90.0
C
   Conditions [deg]\(\beta _{1...4}>90\) or \(\gamma _{1...4}>90\)\(\beta _{5, 6}>90\) and \(\gamma _{5, 6}>90\)
   \(\beta _{1...6}\) [deg]95.1, 95.1, 95.1, 95.190.0, 90.0
   \(\gamma _{1...6}\) [deg]29.9, 29.9, 29.9, 29.990.0, 90.0
D
   Conditions [deg]\(\beta _{1...4}>90\) or \(\gamma _{1...4}>90\)\(\beta _{5, 6}>90\) and \(\gamma _{5, 6}>90\)
   \(\beta _{1...6}\) [deg]67.5, 67.5, 67.5, 67.5120.0, 120.0
   \(\gamma _{1...6}\) [deg]27.5, 27.5, 27.5, 27.5120.0, 120.0