Abstract
The purpose of this study was to quantify ground reaction forces across all planes of motion and determine the influence of instruction associated with vertical, forward and lateral hop landings in premenopausal women. Bilateral jump-landings have previously been the focus in this population with forces quantified primarily in the vertical direction. There is a need to understand and quantify the landing forces for different types of exercises to determine their osteogenic potential as a stimulus for bone development across the life stages, in addition to identifying at risk populations. Such exercises could help to build a better skeleton, and maintenance of that would decrease the susceptibility to fractures and osteoporosis in later years. Twenty-one women [Mean (SD): 43.3 (5.9) yr; 69.4 (9.6) kg; 167 (5.5) cm; 27.5 (8.7) % body fat] performed a testing session ‘with instruction’ followed by a testing session performed one week later with ‘instruction withdrawn’. The resultant magnitudes (4.02 to 4.93 body weights, BW’s) and rates of strain (237 to 319, body weights per second, BW/s), exceeded previously determined jump-landings thresholds (>3BW’s and >43BW/s, respectively) that have achieved bone gains in this population. Jump-type effects were observed, with larger peak vertical and resultant forces (↑10% to ↑14%; <i>p </i>≤.001, BW) produced for the vertical hop. Significant differences (<i>p </i>≤.001) were detected for hop landing ground reaction force’s across all planes of motion (19% to 93%) suggesting that each landing type provides a different type of force distribution as required to optimize bone stimulation. These multidirectional hop-landings represent a unique training stimulus for premenopausal women and exceed osteogenic thresholds thought pre-requisite for bone growth.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.