Grinding is integral to tacking and gybing manoeuvres in Americaâs Cup sailing. Grinding is a standing position cyclic upper body task requiring manual arm cranking of winches, which control movement of the mast and sails. Limited information exists on biomechanical factors involved in grinding performance. This thesis determined technique and muscular performance characteristics of sailors related to grinding performance, and effects of a training intervention on grinding performance. Reliability of grinding ergometer performance testing was evaluated across direction, load and heel conditions.
Most babies will have their first meconium bowel movement within 24 hours of birth, and may have several before the poop changes to a yellow color. The meconium is sticky and tar like and will generally come out in large amounts, larger than the bowel movements will be after the baby gets rid of the meconium.
Symptoms at birth. Around 10% of babies with cystic fibrosis are born with a serious bowel obstruction, known as meconium ileus. This can make them very ill in their first few days of life. All babies are born with meconium in their bowels.