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.
Your Baby's Stool. The first few stools' your baby has will likely be black in color. These stools are referred to as meconium. The color of and consistency of your babies stool will change to reflect the way you have chosen to nourish your baby.