Associations between Daily Step Counts and Physical Fitness in Preschool Children.

Purpose: To investigate the relationships between daily step counts and physical fitness in preschool children.

Methods: Preschoolers' step counts were assessed by ActiGraph accelerometers consecutively for seven days. Physical fitness was assessed by a 20 m shuttle run test (cardiorespiratory fitness), the handgrip and standing long jump tests (musculoskeletal fitness), and the 2 × 10 m shuttle run test (speed/agility).

[Effects of hypoxia conditioned medium of cerebral cortex cells on the differentiation of neural stem cells and related signal pathways].

The aim of this study was to investigate the effects of hypoxia conditioned medium (HCM) of cerebral cortex cells on the differentiation of neural stem cells (NSCs) and to clarify the signal transduction mechanism. The cerebral cortex cells from newborn SD rats were primarily cultured for 5 d, and then the cells were cultured in environments of 4% O2, 1% O2 and normal oxygen concentration, respectively, for 6 h. The culture mediums were collected and centrifuged as the HCM and normoxia conditioned medium (NCM).