Expression of PGC-1 alpha isoforms in response to eccentric and concentric resistance training in healthy subjects

The aim of this study was to investigate the expression of PGC-1 alpha isoforms in response to eccentric and concentric resistance exercise in healthy subjects.

Ten healthy men were randomly divided into two groups (5 men concentric and 5 men eccentric). Isokinetic contraction protocols included eccentric and concentric knee extension with maximum power and angular velocity of 60 degrees per second. The torques for each subject were 60 degrees per second to match the workload in both identical protocols and the rotational speed. Contractions consisted of a maximum of 12 sets of 10 repetitions for the right leg, a rest time of 30 seconds between each set. At the beginning and end of the study, lateralis muscle tissue was biopsied. Biopsies were performed in both distal and proximal directions of the lateral flank. Real time PCR was used to evaluate PGC1α-1 and PGC1α-4 gene expression in each tissue group. Data were analyzed using dependent t-test and covariance test.

The intra-group changes of PGC1α-1 were not significant in eccentric (p = 0.168) and concentric (p = 0.959) groups. There was also a significant difference between PGC1α-4, eccentric group (p = 0.012) and concentric group (p = 0.02).

It seems that lack of significant changes in the desired variables due to the lack of exercise pressure is sufficient to stimulate the increase of PGC1α-1 and PGC1α-4. with regard to reviewing the answer, it seems that the compatibility debate has different results that need to be addressed.