Objective. To determine differences between hypermobile subjects and controls in terms of maximum strength, rate of force development, and balance. Methods. We recruited 13 subjects with hypermobility and 18 controls. Rate of force development and maximal voluntary contraction (MVC) during single leg knee extension of the right knee were measured isometrically for each subject. Balance was tested twice on a force plate with 15-second single-leg stands on the right leg. Rate of force development (N/second) and MVC (N) were extracted from the force-time curve as maximal rate of force development ؍( limit ⌬force/⌬time) and the absolute maximal value, respectively. Results. The hypermobile subjects showed a significantly higher value for rate of force development (15.2% higher; P ؍ 0.038, P ؍ 0.453, ⑀ ؍ 0.693) and rate of force development related to body weight (16.4% higher; P ؍ 0.018, P ؍ 0.601, ⑀ ؍ 0.834) than the controls. The groups did not differ significantly in MVC (P ؍ 0.767, P ؍ 0.136, ⑀ ؍ 0.065), and MVC related to body weight varied randomly between the groups (P ؍ 0.921, P ؍ 0.050, ⑀ ؍ 0.000). In balance testing, the mediolateral sway of the hypermobile subjects showed significantly higher values (11.6% higher; P ؍ 0.034, P ؍ 0.050, ⑀ ؍ 0.000) than that of controls, but there was no significant difference (4.9% difference; P ؍ 0.953, P ؍ 0.050, ⑀ ؍ 0.000) in anteroposterior sway between the 2 groups. Conclusion. Hypermobile women without acute symptoms or limitations in activities of daily life have a higher rate of force development in the knee extensors and a higher mediolateral sway than controls with normal joint mobility.
HM women showed significantly higher TT distances, which were even more accentuated in those having symptoms. The findings point toward less passive stability of the knee joint and thus maybe a need of higher muscle activation in order to stabilize the joint.
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