Percorrer por autor "Almeida, S."
A mostrar 1 - 2 de 2
Resultados por página
Opções de ordenação
- Enhancing the assessment of cardiorespiratory fitness using field testsPublication . Marques, A.; Rebelo, P.; Paixão, C.; Almeida, S.; Jácome, C.; Cruz, J.; Oliveira, A.Objective To establish normative values and reference equations of the 6-minute walk test (6MWT), incremental shuttle walk test (ISWT) and unsupported upper limb exercise test (UULEX) for Portuguese adults. Design Cross-sectional study. Descriptive statistics and differences between age decades and genders were explored using univariate general linear models to compute reference values. Reference equations were established with a forward stepwise multiple regression. Setting General community. Participants In total, 645 adult volunteers without disabilities [43% male, mean age 55.1 (standard deviation 23.6) years] were recruited from the university campus and surrounding community. Intervention Not applicable. Main outcome measures Data on age, gender, height, weight, body mass index and smoking status were collected using a structured questionnaire. Physical activity was evaluated using the Brief Physical Activity Assessment Tool. Participants performed two repetitions of the 6MWT, ISWT and UULEX, and the best repetition was used for analysis. Results Overall, performance was better in males than in females, and decreased with age. Participants’ performance was significantly reduced after the sixth decade of life compared with the other decades (P < 0.001). Reference equations were: 6MWT = 226.93-(5.00 × age) + (360.41 × height), R2 = 71%; ISWT = 393.81-(17.98 × age)+(185.64 × gender) + (775.88 × height), R2 = 83%; and UULEX = 16.71-(0.14 × age) + (2.66 × gender), R2 = 57%. Conclusion Leg or arm exercise field tests are affected significantly by age and gender. These results will aid health professionals to interpret the results of field tests obtained from healthy or diseased adult populations.
- Ti6Al4V cellular structures impregnated with biomedical PEEK: New material design for improved tribological behaviorPublication . Buciumeanu, M.; Almeida, S.; Bartolomeu, F.; Costa, M.M.; Alves, N.; Silva, F.S.In the present work, a new material design of Ti6Al4V-PEEK hybrid cellular structure with improved wear resistance is proposed. Samples with different dimensions of the open-cells (350, 400, 450, 500 μm) were fabricated by Selective laser melting (SLM) technology, while Hot pressing (HP) technology was employed to produce Ti6Al4V-PEEK hybrid cellular structures. The tribological tests were performed in Phosphate Buffered Saline solution at 37 ± 2 C. Results demonstrated that the addition of the biomedical PEEK protected the Ti6Al4V cellular structures, thus improving these hybrid structures wear resistance when increasing the amount of PEEK. The obtained results indicated that the Ti6Al4V-PEEK hybrid cellular structure with the dimensions of the opencells of 500 μm is a suitable structure for orthopedic implants, with improved properties.