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

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*

$\dot{\mathrm{V}}{\mathrm{O}}_2$ (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

${\dot{\mathrm{V}}\mathrm{CO}}_2$ (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*