Maturity alters drop vertical jump landing force-time profiles but not performance outcomes in adolescent females
Lloyd, Rhodri S.
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The stretch-shortening cycle (SSC) assists in effective force attenuation upon landing and augments force generation at take-off during a drop vertical jump (DVJ). General performance outcomes such as jump height or peak measures have been used to assess SSC function in youth populations; however, these discrete metrics fail to provide insight into temporal jump-landing characteristics. This study assessed DVJ force-time profiles in 1013 middle and high-school female athletes (n = 279 prepubertal, n = 401 pubertal, n = 333 postpubertal). Maturity status was determined using the Pubertal Maturation Observation Scale. Ground reaction force data were analysed to extract a range of variables to characterize force-time profiles. SSC function was categorized as poor, moderate or good dependent on the presence of an impact peak and spring-like behaviour. No differences in jump height or ground contact time were observed between maturity groups (p > 0.05). Significant differences in absolute peak landing and take-off force were evident between all maturational statuses (p < 0.05). Relative to bodyweight normalized forces, only peak take-off force was significantly different between prepubertal and postpubertal groups (p < 0.05; d = 0.22). Spring-like behaviour showed small improvements from pubertal to postpubertal (p < 0.05; d = 0.25). Most females displayed poor SSC function at prepubertal (79.6%), pubertal (77.3%) and postpubertal (65.5%) stages of maturity. Large increases in absolute forces occur throughout maturation in female athletes, however, only small maturational differences were found in relative force or spring-like behaviour. Consequently, most girls display poor SSC function irrespective of maturity.
Scandinavian Journal of Medicine and Science in Sport;
Pedley, J.S., DiCesare, C.A., Lloyd, R.S., Oliver, J.L., Ford, K.R., Hewett, T.E. and Myer, G.D. (2021) 'Maturity alters drop vertical jump landing force-time profiles but not performance outcomes in adolescent females', Scandinavian Journal of Medicine and Science in Sports. https://doi.org/10.1111/sms.14025
Article published in Scandinavian Journal of Medicine and Science in Sports available at https://doi.org/10.1111/sms.14025
Cardiff Metropolitan University (Grant ID: Cardiff Metropolian (Internal))
- Sport Research Groups 
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