procedure
The researchers used ordinary least squares linear regression to compare ΔEE to Δ({\dot{{\rm{V}}}}{{\rm{E}}}) and ΔHR, and used multiple regression to assess the independent, additive effects of ({\dot{{\rm{V}}}}{{\rm{E}}}) and HR on ΔEE, setting the intercept to 0 under the assumption that ΔEE was attributable to circulatory and ventilatory expenditure.

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