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Table 4 Cardiorespiratory and substrate oxidation responses to 30 min exercise before and after training period

From: 4 weeks of high-intensity interval training does not alter the exercise-induced growth hormone response in sedentary men

Time    0 min 30 min 60 min 90 min
Heart rate (bpm) HIT Before 75 ± 5 163 ± 5* 91 ± 3* 82 ± 3
After 73 ± 3 155 ± 4* 97 ± 4* 81 ± 4*
LT Before 73 ± 3 167 ± 4* 93 ± 3* 86 ± 3*
After 70 ± 3 160 ± 4* 99 ± 3* 85 ± 2*
V ˙ O 2 (ml/min) HIT Before 260 ± 14 2041 ± 101* 269 ± 19 269 ± 12
After 253 ± 15 2157 ± 107* 269 ± 17 268 ± 20
LT Before 258 ± 11 1953 ± 99* 276 ± 15 261 ± 15
After 243 ± 17 1953 ± 120* 247 ± 11 251 ± 14
V ˙ CO 2 (ml/min) HIT Before 211 ± 13 1924 ± 102* 195 ± 15 210 ± 12
After 200 ± 13 2056 ± 97* 205 ± 12 208 ± 15
LT Before 211 ± 9 1892 ± 101* 206 ± 11 203 ± 11
After 207 ± 18 1919 ± 116* 192 ± 12 198 ± 12
RER HIT Before 0.81 ± 0.02 0.94 ± 0.01* 0.73 ± 0.02* 0.78 ± 0.02
After 0.79 ± 0.01 0.96 ± 0.01* 0.77 ± 0.03 0.78 ± 0.02
LT Before 0.83 ± 0.01 0.97 ± 0.01* 0.75 ± 0.01* 0.78 ± 0.02*
After 0.85 ± 0.02 0.99 ± 0.01* 0.77 ± 0.02* 0.79 ± 0.02*
Carbohydrate contribution (%) HIT Before 35.4 ± 7.3 79 ± 3.9* 11.9 ± 4.0* 23.2 ± 5.9
After 26.8 ± 3.2 84.6 ± 2.8* 21.5 ± 8.8 25.5 ± 6.7
LT Before 39.7 ± 4.7 88.3 ± 2.4* 12.9 ± 3.5* 24.5 ± 5.2*
After 47.5 ± 5.1 91.9 ± 2.0* 21.5 ± 6.4* 27.6 ± 4.9*
Fat contribution (%) HIT Before 64.6 ± 7.3 20.2 ± 3.9* 88.1 ± 3.9* 76.8 ± 5.9
After 73.2 ± 3.2 15.4 ± 2.8* 78.5 ± 8.8 74.5 ± 6.7
LT Before 60.4 ± 4.7 11.8 ± 2.4* 87 ± 3.5* 75.6 ± 5.2*
   After 52.5 ± 5.1 8.2 ± 2.0* 78.5 ± 6.4* 72.4 ± 4.9*
  1. Values are means ± SE. *; P < 0.05 vs. 0 min. Carbohydrates and fat contributions indicate the relative utilization rate of energy resource to the total energy expenditure during 30 min exercise and 60 min recovery.