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The aim of the study was to compare the fatigue rates of the deltoid muscle portions in the scapular and frontal planes. Ten healthy men without shoulder muscle impairment took part in the study. They performed isometric arm abduction for 30 seconds against a resistance of load cell while the electromyographic data were collected. The electromyographic data were transformed by the Fast Fourier Transform, to obtain the median power frequency (MDPF). The changes in MDPF of the three deltoid portions in the scapular and frontal planes were compared. The acromialis and spinalis portions fatigued during the exercises. The clavicularis portion presented no fatigue. A statistically significant difference occurred between the clavicularis and the other two portions (P < 0.05). No differences were found when the planes were compared. It represents to practice no preferential order during rehabilitation. Moreover, the acromialis and spinalis portions fatigue, although the clavicularis portion did not fatigue. The actions of other muscles of the shoulder girdle can explain this fact. Moreover, these two portions need more attention to avoid fatigue during exercises. In general, therapeutic strategies for injured patients should not only be directed towards increased force, but also towards fatigue control during shoulder exercises.

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CONTEXTUALIZAÇÃO: O teste sentar e alcançar (TSA), utilizado para mensurar flexibilidade da coluna lombar e músculos isquiotibiais (IT), é mais adequado quando realizado concomitante à mensuração do ângulo da articulação do quadril (AAQ). OBJETIVO: Avaliar a confiabilidade intra e interobservadores do TSA na mensuração do comprimento dos IT por meio da análise cinemática angular. MÉTODO: Participaram 50 universitários (X= 21,5 anos; DP= 1,5) sem alterações musculoesqueléticas. Foram utilizados: banco padrão do TSA com porta para avaliar a ação dos gastrocnêmios no TSA e câmera fotográfica digital posicionada sobre um tripé. Marcadores cutâneos foram posicionados na: espinha ilíaca ântero-superior e trocânter maior. Realizaram-se duas aquisições de imagem: uma com porta fechada - PF e outra, aberta - PA. Para testar a confiabilidade intra e interobservadores foram utilizados: coeficiente de correlação intraclasse (CCI) - efeito aleatório com um fator - e teste de concordância de Bland e Altman (d = diferença média entre as medidas) com os respectivos intervalos de confiança de 95 por cento (IC 95 por cento). RESULTADOS: Os testes de confiabilidade intra-observador do AAQ foram: CCIpf = 0,97 - IC95 por cento [0,95;0,99] e Bland e Altman d = -0,02 - IC95 por cento [-0,11;0,07]; CCIpa= 0,98 - IC95 por cento [0,96;0,99], d = -0,01 - IC95 por cento [-0,11;0,08]. Para confiabilidade interobservador: CCIpf =0,96 - IC95 por cento [0,94;0,98] e d = -0,07 - IC95 por cento [-0,19;0,03]; CCIpa=0,96 - IC95 por cento [0,93;0,98] e d = -0,06 - IC95 por cento [-0,19;0,52]. CONCLUSÃO: Os testes intra e interobservador (PF e PA) da avaliação do AAQ, pela análise cinemática, apresentaram alta confiabilidade. A técnica é de fácil aplicação (necessita apenas do banco TSA padrão e câmera fotográfica) e fornece à prática clínica um método confiável para mensurar os IT pela cinemetria.

BACKGROUND: The sit-and-reach test (SRT) is used to measure the flexibility of the lumbar spine and hamstring muscles and is better when the hip joint angle (HJA) is measured concomitantly. OBJECTIVE: To assess the intra and interobserver reliability of the SRT for measuring hamstring muscle length through angular kinematic analysis. METHOD: Fifty university students (X= 21.5 years; SD= 1.5) without musculoskeletal abnormalities took part. A standard SRT bench with a door (to assess the action of the gastrocnemius muscles) and a digital photographic camera positioned on a tripod were used. Skin markers were placed on the anterosuperior iliac spine and greater trochanter. Two images were recorded: one with the door closed (DC) and another with the door open (DO). To test the intra and interobserver reliability, the intraclass correlation coefficient (ICC) (random effect with one factor) and the Bland and Altman concordance test (d= mean difference between measurements) were used, with the respective 95 percent confidence intervals (95 percent CI). RESULTS: The intraobserver reliability of the HJA test was: ICCdc= 0.97 (95 percent CI [0.95;0.99]) and Bland and Altman d = -0.02 (95 percent CI [-0.11;0.07]); ICCdo = 0.98 (95 percent CI [0.96;0.99]), d = -0.01 (95 percent CI [-0.11;0.08]). For the interobserver reliability: ICCdc= 0.96 (95 percent CI [0.94;0.98]) and d = -0.07 (95 percent CI [-0.19;0.03]); ICCdo= 0.96 (95 percent CI [0.93;0.98] and d = -0.06 (95 percent CI [-0.19;0.52]. CONCLUSION: The intra and interobserver reliability tests (DC and DO) for HJA assessment using kinematic analysis showed high reliability. The technique is easy to apply (only requiring a standard SRT bench and a photographic camera) and provides a reliable method for measuring hamstring muscles using kinematic analysis in clinical practice.

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