NRF-1 genotypes and endurance exercise capacity in young Chinese men.

BACKGROUND

Nuclear respiratory factor 1 (NRF-1) is a critical component of the energy-sensing mechanism in mammalian cells, and translates physiological signals (particularly those induced by exercise) into increased capacity for mitochondrial biogenesis and oxidative phosphorylation.

OBJECTIVE

To study the possible association between rs2402970, rs6949152 and rs10500120 NRF-1 genotypes and several phenotypes indicative of maximum (VO(2max)) and submaximum aerobic capacity (ventilatory threshold (VT) and metabolic cost of submaximum running at 12 km/hour (running economy; RE)) both at baseline and in response to a 18-week endurance training programme in young Chinese men of Han origin (n = 102; 19 (SD 1) years).

RESULTS

For rs2402970, a significant genotype effect was seen for VT (p = 0.004) and RE (p = 0.027). For rs6949152, a significant interaction (genotypextraining) effect (p = 0.047) was found for VT.

CONCLUSIONS

There is an association between NRF-1 genotypes (rs2402970 and rs6949152 polymorphisms) and the baseline and/or training response of human aerobic capacity. More research is needed to corroborate our data in other ethnic groups with lower fitness levels at the pre-training state (particularly Caucasians) and to identify the molecular mechanisms involved in the genotype-phenotype associations we found.