How does postural stability following a single leg drop jump landing task relate to postural stability during a single leg stance balance task?

Abstract

We aimed to verify whether the static phase after a single leg drop jump (DJ) landing on a force plate may serve as a proxy for a single leg stance (SLS) balance task, as this would increase the application possibilities of landing tasks in the evaluation of sensorimotor function in relation to injury rehabilitation or performance assessment. Twenty-five healthy participants performed two sessions of five valid trials for both tasks in a reproducibility-agreement design. Three postural stability outcome measures ('COP speed', 'COP sway' and 'Horizontal GRF') were calculated for DJ (5-20s after landing) and for SLS (15s), and were averaged per session. Paired T-tests revealed a learning effect of SLS for postural stability (4.6-6.1%; P-values <0.03), in contrast to DJ (P-values >0.27). Only session 2 resulted in superior postural stability for SLS compared to DJ for 'COP speed' (5.0%; P=0.017) and 'Horizontal GRF' (8.2%; P=0.001). Bland and Altman methods demonstrated inter-session SD's of difference for DJ of 11-12% and for SLS of 10-12%, while inter-task SD's of difference ranged 10-17%. Precision ('SD within') was better for SLS concerning 'COP speed' (14-15% vs 13%) and 'Horizontal GRF' (18-20% vs 14-15%). In conclusion, postural stability during DJ and SLS cannot be considered interchangeable, due to a learning effect for SLS and inferior precision for DJ. However, a DJ task may be used as a proxy for static postural stability, although more than three trials are needed to achieve individual errors similar to SLS for 'COP speed' (4) and 'Horizontal GRF' (5).

Time series of ground reaction forces following a single leg drop jump landing in elite youth soccer players consist of four distinct phases

“…In accordance with previous studies [26], COP speed showed consistently higher reliability compared to COP sway and Hor GRF. Table 1 An overview of the identified phases, in relation to the factors and their correlation; the identified windows that were most representative for a given phase and the mean resultant center of pressure speed (COP speed), mean resultant center of pressure sway (COP sway) and mean resultant horizontal ground reaction force (Hor GRF); intraclass correlation coefficients (ICC) are shown with 95% confidence interval (95% ci).…”

“…Therefore, distinct information may be available within the dynamic phases as well. An interesting characteristic of the jump landing task is that the landing itself, the stabilizing phase and static balance performance can be evaluated [26]. To date, a thorough and systematic evaluation of the complete COP and GRF time series following landing has not been addressed.…”

The effect of the stability threshold on time to stabilization and its reliability following a single leg drop jump landing

“…Possibly this could reveal new important characteristics of the force time series, in addition to the impact phase ('peak GRF' and 'time to peak GRF') and the static phase ('center of pressure (COP) speed', 'COP sway' and 'horizontal GRF') (Fransz et al, 2014), that may discriminate in stabilizing performance.…”

Effects of Reach Balance Exercise on Toe Grip Strength and Balance in College Basketball Players

“…"Centipede walking" with active exercise for 2 months helped to improve the toe grip strength and the time of closed-eye single-leg standing. Handa et al 10) and Fransz et al 21) suggested that toe grip strength has a stronger Data are mean±SD.…”