SELF-CORRECTION OF DEADLIFT FORM UTILIZING REAL TIME VISUAL FEEDBACK INFORMATION

Practice in front of mirrors to enhance performance through visual feedback and knowledge of performance is common in athletics that require precision and fine body control like dance and gymnastics. It is also very common to enhance motor learning of a task through evaluation of performance after the completion of a motor task such as weight lifting. Competitive weightlifters often utilize recordings of their lifts to improve future performance by evaluating form, technique, speed of movements, and several other factors that influence the quality of the lift. Studies have been performed to analyze the effect of the use of mirrors during the performance of a power-clean, but no known study has been completed evaluating the use of a system that provides concurrent augmented visual feedback of a weightlifter’s sagittal plane. The visual feedback system utilized in this study projects a real-time video image of the subject’s sagittal plane to a screen directly in front of the subject allowing the subject to view their performance as they complete a deadlift. Each subject performed two deadlifting sessions, one utilizing concurrent visual feedback and one without. During each session the subject achieved a 1RM for the deadlift then performed successive repetitions at 90% of their 1RM to determine if the use of concurrent visual feedback effected maximum force production or the subject’s ability to self-correct discrepancies in their form allowing them to complete more repetitions with proper form as they fatigue. Statistical analysis showed a significant increase in maximal strength when concurrent visual feedback was provided; no significant difference was seen concerning the performance of repeated efforts at 90% 1RM.