Table 3.

Effects of training and genotype-training interactions in the response to high-intensity intermittent training for muscle fiber types and enzyme activities

Enzyme	Before training mean ± SD	After training mean ± SD	Genotype-training interaction F ratio	Intrapair resemblance in response
CK	237.0 ± 48	278.0 ± 98	9.8**	0.82
HK	1.3 ± 0.4	1.41 ± 0.36	3.8*	0.59
PFK	152.0 ± 27	155.0 ± 52	2.2	0.38
LDH	239.0 ± 122	201.0 ± 93	4.6**	0.64
MDH	220.0 ± 56	246.0 ± 44*	3.0*	0.50
HADH	3.7 ± 1.2	5.03 ± 1.55**	1.3	0.15
OGDH	0.7 ± 0.2	1.04 ± 0.23**	3.0*	0.50
PFK/OGDH ratio	558.0 ± 173	231.0 ± 109	4.5**	0.64

All enzymes were expressed in μmol of NADH or NADPH per gram of wet weight per minute.

n=12 pairs of MZ twins. HADH=3-hydroxyacyl CoA dehydrogenase, CK=creatine kinase, HK=hexokinase, LDH=lactate dehydrogenase, MDH=malate dehydrogenase, OGDH=oxoglutarate dehydrogenase, PFK=phosphofructokinase.

^*p < 0.05

^**p < 0.01

From Simoneau, J.A. et al. (1986) Inheritance of human skeletal muscle and anaerobic capacity adaptation to high-intensity intermittent training. International Journal of Sports Medicine 7, 167–171. Reproduced with permission from Thieme.