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. 2020 Oct 21;11:544559. doi: 10.3389/fphys.2020.544559

FIGURE 4.

FIGURE 4

Mean ± SD V˙O2 (A), V˙E (B), HR (C), RER (D), RPEL (E), and RPEC (F) responses to 30 min level and downhill walking. All responses were greater during level than downhill walking (p < 0.001).