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Table 1 Means, standard deviations, and values for each variable included in the statistical calculations

From: Performance with an additional load: formula-based predictions for controlling the load intensity when carrying backpacks

Variable

Without additional load

With additional load 32.0 ± 14,2%

p-value

Speed (km/h) at VT1

9.3 ± 1.4

7.4 ± 1.2

< 0.001*

HR (bpm) at VT1

157 ± 14

152 ± 16

0.002

VO2 (L/min) at VT1

2.4 ± 0.6

2.3 ± 0.6

< 0.001*

Speed (km/h) at VT2

12.9 ± 1.8

10.0 ± 1.8

< 0.001*

HR (bpm) at VT2

182 ± 10

176 ± 10

< 0.001*

VO2 (L/min) at VT2

3.2 ± 0.7

3.0 ± 0.7

< 0.001*

HR peak (bpm)

187 ± 10

183 ± 9

< 0.001*

VO2 peak (mL/kg/min-1)

48.6 ± 6.9

46.9 ± 7.2

< 0.001*

  1. Data are presented in mean ± SD. N = 105 (VT2; N = 88)
  2. bpm beats per minute km/h kilometres per hour, L/min litres per minute, mL/kg/min-1 millilitres per kilogram per minute, SD standard deviation, VO2 oxygen uptake, peak value at peak exercise, VT1 ventilatory threshold 1, VT2 ventilatory threshold 2