Effects of functional and combined training on subsets of memory T cells and functional fitness of postmenopausal women: A randomized controlled trial

Abstract

This study investigated the effects of functional (FT) and combined (CT) training on memory T cells and functional fitness of postmenopausal women. 108 participants were randomly allocated to the control (CG), FT and CT groups. Functional fitness was assessed through physical tests similar to daily activities, such as dressing on and taking off a t-shirt (DTTS), 10-meter walking and countermovement jump. The CCR7 and CD45RA surface markers were used to characterize the memory T cells. Regarding the frequency of memory T cells, both training protocols reduced the percentage of CD4+ Terminally Differentiated Effector Memory T Cells Re-Expressing CD45RA (TEMRA) (FT: -38.73%, p=0.0455; CT: -30.43%, p=0.0036) and CD8+ TEMRA cells (FT: -22.24%, p<0.0013; CT: -13.13%, p=0.0051). Also, both FT and CT increased the percentage of central memory (TCM) CD4+ (FT: +55.22%, p=0.0104; CT: +68.03%, p=0.0167) and CD8+ (FT: +142.00%, p<0.0001; CT: +83.76%, p=0.0001) T cells. Furthermore, FT and CT increased the percentages of CD8+ effector memory T cells (TEM) (FT: +63.58%, p<0.0001; CT: +14.12%, p=0.0041). Regarding functional fitness, both training protocols reduced the time required to perform the DTTS (FT: -19.71%, p<0.0001; CT: -14.69%, p<0.0001) and 10-m walk tests (FT: -13.05%, p<0.0001; CT: -12.83%, p<0.0001), in addition to improving jumping ability (FT: +29.97%, p<0.0001; CT: +20.00%, p<0.0001), both compared to the pre-test or to the CG. Therefore, both FT and CT seem to be equally effective alternatives for promoting the reduction of CD4+ and CD8+ TEMRA cells, increasing the frequency of TCM and TEM cells, and improving functional fitness of postmenopausal women.