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Table 1 Physiological responses during load carriage with the DM and CM of the backpack

From: Effect of heavy load carriage on cardiorespiratory responses with varying gradients and modes of carriage

Parameter Grade Mode of carriage (mean ± SD) % of change
No Load DM (31.4 kg) CM (31.4 kg) NL vs DM NL vs CM CM vs DM
HR (beats/min) −10% 88.00 ± 8.89 107.00 ± 7.00 92.00 ± 5.43 21.59* 4.55 16.30
−5% 89.00 ± 8.01 111.00 ± 5.54 92.00 ± 4.91 24.72* 3.37 20.65*
0% 95.00 ± 7.00 121.00 ± 4.67 100.00 ± 5.54 27.37* 5.26* 21.00
5% 111.00 ± 8.31 160.00 ± 13.50 125.00 ± 8.73 44.14* 12.61* 28.00*
10% 130.00 ± 9.09 183.00 ± 7.48 156.00 ± 8075 40.77* 20.00* 17.31
VO2 [ml/(min·kg)] −10% 6.64 ± 2.17 9.12.00 ± 3.35 8.24 ± 2.05 37.35* 24.10 10.68
−5% 6.76 ± 1.87 9.58 ± 3.85 8.92 ± 2.14 41.72* 31.95 7.40
0% 9.45 ± 2.13 13.50 ± 3.39 12.84 ± 2.50 42.86* 35.87 5.14
5% 15.14 ± 2.80 22.76 ± 3.57 17.75 ± 1.43 50.33* 17.24 28.23
10% 21.12 ± 2.58 30.50 ± 3.63 25.69 ± 4.53 44.41* 21.64 18.72
EE (kcal/min) −10% 2.45 ± 0.85 3.29 ± 1.20 2.87 ± 0.68 34.29* 17.14 14.63
−5% 2.51 ± 0.79 3.45 ± 1.34 3.11 ± 0.72 37.45* 23.90 10.93
0% 3.49 ± 0.90 4.46 ± 1.28 4.43 ± 0.88 27.79* 26.93 0.68
5% 5.59 ± 1.15 8.28 ± 1.29 6.26 ± 0.45 48.12* 11.99 32.27*
10% 7.86 ± 1.22 11.61 ± 1.20 9.23 ± 1.27 47.71* 17.43 25.79*
RF (breaths/min) −10% 27.49 ± 5.74 33.51 ± 6.40 31.62 ± 5.76 21.90* 15.02 5.98*
−5% 26.58 ± 4.94 33.38 ± 6.46 32.39 ± 5.98 25.58* 21.86 3.06*
0% 27.51 ± 6.54 34.13 ± 5.77 32.29 ± 6.14 24.06 17.38 5.70*
5% 28.51 ± 4.20 37.54 ± 5.18 35.34 ± 4.93 31.67* 23.96 6.23
10% 30.57 ± 3.73 44.67 ± 7.16 40.40 ± 5.61 46.12* 32.16 10.57*
  1. NL No load, DM Distributed mode, CM Compact mode, HR Heart rate, VO2 Oxygen consumption, EE Energy expenditure, RF Respiratory frequency; *P < 0.05