Browsing by Author "Valente, Isabel"
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- Ankle stiffness assessment in individuals with chronic ankle instability in dual-task single leg stance on an unstable surfacePublication . Dias, Nuno; Estupendo, Hugo; Valente, Isabel; Carmo, Luis; Sousa, AndreiaThe shoulder of handball players suffers from the ongoing repetition of movement that may lead to the development of joint instability and modification of proprioceptive condition. Because the articular components of the shoulder joint are considered to have extreme importance on the static and dynamic stabilisation and quality of proprioceptive information, they may compromise the athlete’s performance. The purpose of our study was to verify if shoulder strength parameters (SSP) and joint position sense (JPS) of shoulder internal and external rotation may contribute to the development of shoulder instability in handball players.
- Avaliação do timing das respostas de curta latência na instabilidade crónica do tornozeloPublication . Valente, Isabel; Pinto, Ana; Santos, Rubim; Sousa, AndreiaO controlo postural (CP) envolve um processo complexo multisegmentar para manter o duplo propósito da orientação e estabilidade. Tem sido demonstrado que a informação propriocetiva proveniente do pé e tornozelo apresenta um papel fulcral na manutenção do CP. As alterações proprioceptivas decorrente de lesão capsuloligamentar do tornozelo parecem estar na origem da disfunção neuromuscular associada à instabilidade crónica do tornozelo. Apesar de vários estudos se terem dedicado ao estudo do timing dos ajustes posturais de curta latência (SLR), a análise desta condição patológica tem sido focada numa abordagem unilateral.
- Reliability of two methods for identifying the timing of medium latency responses in subjects with and without chronic ankle instabilityPublication . Pinheiro De Sousa, Andreia Sofia; Valente, Isabel; Pinto, Ana; Santos, RubimThis study aims to: (1) to compare 2 methods of assessing the timing of medium latency responses (MLR), in regard to intrasession reliability and mean values, in subjects with and without chronic ankle instability (CAI), and (2) to analyze the influence of CAI in timing of MLR and in its reliability. Thirty six athletes with (16) and without (20) CAI participated. Bilateral electromyography of peroneus longus (PL), peroneus brevis (PB), tibialis anterior (TA) and soleus (SOL) muscles was collected during a unilateral sudden inversion perturbation to assess the timing of MLR onset, in both standing and perturbed positions, through a baseline-based method and a peak-response-based method. The group without CAI presented higher relative reliability of SOL and peroneal muscles MLR with the peak response-based method than with the baseline-based method. Compared with the group without CAI and in both methods, the group with CAI presented a delayed and less reliable TA MLR, as well decreased coefficient variation of PL MLR in the uninjured limb. In conclusion, regardless of the method subjects with CAI present delayed and less reliable TA MLR while in subjects without CAI the peak response-based method provides higher reliability.
- Short and Medium Latency Responses in Participants With Chronic Ankle InstabilityPublication . Sousa, Andreia S. P.; Valente, Isabel; Pinto, Ana; Soutelo, Tiago; Silva, MárciaContext: The determinant role of medium latency responses (MLRs) during compensatory postural adjustments in postural stability and the lack of clarity about the mechanisms behind chronic ankle instability (CAI) sustain the hypothesis that these postural responses are impaired in this condition. However, to the best of our knowledge, no authors have assessed MLRs in patients with CAI; most of the research regarding compensatory postural adjustments has been directed at the timing of short latency responses (SLRs). Objective: To evaluate bilateral compensatory postural responses, including SLRs and MLRs, in response to a unilateral simulated ankle-sprain mechanism in participants with CAI. Design: Case-control study. Setting: Laboratory. Patients or Other Participants: Twenty-four participants with CAI and 20 controls. Intervention(s): Bilateral electromyography of the peroneus longus (PL), peroneus brevis, tibialis anterior (TA), and soleus (SOL) muscles was collected during a unilateral sudden-inversion perturbation (30°). Main Outcome Measure(s): Muscle-onset activations and magnitudes of SLRs and MLRs in the support and perturbed positions. Results: Participants with CAI showed (1) later-onset activation of the TA and SOL in the uninjured limb and bilateral decreases in the magnitude of the TA MLR in the support position, (2) increased magnitude of the PL MLR in the uninjured limb in the support and perturbed positions, and (3) increased magnitude of the PL SLR and MLR in the injured limb in the perturbed position. Conclusions: Chronic ankle instability was associated with later TA and SOL activation in the uninjured limb and bilaterally decreased magnitude of the TA MLR in the support position.