Instantaneous Metabolic Cost of Walking: Joint-Space Dynamic Model with Subject-Specific Heat Rate.

摘要: A subject-specific model of instantaneous cost transport (ICOT) is introduced from the joint-space formulation metabolic energy expenditure using laws thermodynamics and principles multibody system dynamics. Work heat are formulated in generalized coordinates as functions joint kinematic dynamic variables. Generalized rates mapped muscle energetics estimated experimental walking data for whole body, including upper-body bilateral synchronization. Identified energetic parameters-mass, height, (estimated) maximum oxygen uptake, torques-are incorporated into rate, opposed to traditional vitro subject-invariant parameters. The total values within 5.7 ± 4.6% error measured with strong (R2 > 0.90) inter- intra-subject correlations. reliably predicts characteristic convexity magnitudes (0.326-0.348) COT (0.311-0.358) across different subjects speeds. ICOT a function time provides insights gait causes effects (e.g., normalized comparison sensitivity respect speed) phase-specific COT, which unavailable conventional measurements or models. Using variables commonly simulated data, models enable real-time evaluations transient non-periodic general tasks that use range (aerobic) pathway similar steady-state walking.