Asymmetry Thresholds for Common Screening Tests and Their Effects on Jump Performance in Professional Soccer Players.

Context: Arbitrary asymmetry thresholds are regularly used in professional soccer athletes, notwithstanding the sparse literature available to examine their prevalence.

Objective: To establish normative and positional asymmetry values for commonly used screening tests and investigate their relationships with jumping performance.

Design: Cross-sectional study.

Timing of the decline in physical activity in childhood and adolescence: Gateshead Millennium Cohort Study.

Background And Aim: There is a widely held and influential view that physical activity begins to decline at adolescence. This study aimed to identify the timing of changes in physical activity during childhood and adolescence.

Methods: Longitudinal cohort study (Gateshead Millennium Study) with 8 years of follow-up, from North-East England.