Use of apostrophes by six to nine year old children

This paper investigated six to nine year old children's ability to use contractive and possessive apostrophes, the effects of type and token frequency, and the effect of teaching on this ability. Apostrophes provide an interesting opportunity to examine the basis of frequency effects in rule inference, as type and token frequencies dissociate in apostrophes found in children's early reading materials. Teaching effects are now open to inspection as the National Literacy Strategy Framework for Teaching lays down a specific and detailed curriculum and teaching timetable. Results showed that token but not type frequency influenced children's correct use of apostrophes. There were also effects of teaching.     

A comparison of haemolytic responses in fore-foot and rear-foot distance runners

This study examined the haemolytic effects of an interval-based running task in fore-foot and rear-foot striking runners. Nineteen male distance runners (10 fore-foot, 9 rear-foot) completed 8 × 3 min repeats at 90% vVO_2peak on a motorised treadmill. Pre- and post-exercise venous blood samples were analysed for serum haptoglobin to quantify the haemolytic response to running. Vertical ground reaction forces were also captured via a force plate beneath the treadmill belt. Haptoglobin levels were significantly decreased following exercise (P = 0.001) in both groups (but not between groups), suggesting that the running task created a haemolytic stress. The ground reaction force data showed strong effect sizes for a greater peak force (d = 1.20) and impulse (d = 1.37) in fore-foot runners, and a greater rate of force development (d = 2.74) in rear-foot runners. The lack of difference in haptoglobin response between groups may be explained by the trend for fore-foot runners to experience greater peak force and impulse during the stance phase of their running gait, potentially negating any impact of the greater rate of force development occurring from the rear-foot runners’ heel strike. Neither type of runner (fore-foot or rear-foot) appears more susceptible to technique-related foot-strike haemolysis.