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Indices of co-variation of elemental variables (ΔV) averaged across subjects for all six component of the force and moment of force vectors. (A) and (C) show ΔV across lever arms at the VF-TH and IF level, respectively. (B) and (D) show ΔV across external loads at the VF-TH and IF level, respectively. Note that ΔV are predominantly positive at both levels (with the exception of Fn at the IF level), and changes in the lever arm and load magnitude had only minor effects on ΔV.
