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Table 3 Myocardial function at rest and maximal exertion by condition

From: Myocardial functional responses do not contribute to maximal exercise performance in the heat

  Temperate (n = 12) Heat stress (n = 12)
Rest Maximal Delta Rest Maximal Delta
Stroke volume (mL beat−1) 81 (14) 116 (20) 35 (16) 72 (16) 111 (24) 39 (17)
Stroke index (mL beat−1 m−2) 40.3 (6.3) 57.5 (6.2) 17.2 (6.9) 35.5 (6.3) 54.9 (8.7) 19.4 (8.1)
Cardiac output (L min−1) 5.5 (1.1) 21.3 (3.5) 15.8 (3.0) 5.1 (1.3) 20.4 (4.1) 15.3 (3.3)
Cardiac index (L min−1 m−2) 2.7 (0.4) 10.6 (1.1) 7.8 (1.1) 2.5 (0.5) 10.1 (1.5) 7.6 (1.4)
Aortic velocity (cm s−1) 102 (10) 204 (23) 103 (21) 95 (10) 205 (29) 110 (23)
Ejection time (s) 0.247 (0.037) 0.173 (0.023) −0.074 (0.025) 0.242 (0.034) 0.167 (0.015) −0.075 (0.029)
Ejection rate (mL s−1) 326 (21) 673 (114) 347 (107) 296 (56) 661 (117) 365 (85)
S (cm s−1) 12 (2) 26 (3) 13 (3) 14 (2) 25 (3) 12 (4)
E (cm s−1) 69 (15) 167 (17) 97 (16) 71 (14) 159 (11) 88 (14)
E′ (cm s−1) 16 (3) 32 (5) 16 (7) 15 (3) 31 (4) 17 (5)
E/E 4.4 (1.1) 5.3 (0.9) 0.9 (1.4) 5.0 (1.5) 5.2 (0.8) 0.2 (1.8)
  1. Values are mean (SD).
  2. Main effect of time (p < 0.001) for all variables except E/E′.