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.

Impact of storm water on groundwater quality below retention/detention basins.

Groundwater from 33 monitoring of peripheral wells of Karachi, Pakistan were evaluated in terms of pre- and post-monsoon seasons to find out the impact of storm water infiltration, as storm water infiltration by retention basin receives urban runoff water from the nearby areas. This may increase the risk of groundwater contamination for heavy metals, where the soil is sandy and water table is shallow. Concentration of dissolved oxygen is significantly low in groundwater beneath detention basin during pre-monsoon season, which effected the concentration of zinc and iron.