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- Reliability and validity of the international physical activity questionnaire short-form (IPAQ-sf) in COPDPublication . Flora, Sofia; Hipólito, Nádia; Santos, Liliana; Januário, Filipa; Silva, Sónia; Valente, Carla; Andrade, L; Rodrigues, Fátima; Marques, Alda; Cruz, JoanaPhysical activity (PA) may improve COPD prognosis, thus its assessment and promotion are crucial. The International Physical Activity Questionnaire Short-Form (IPAQ-sf) is widely used for assessing PA but there is limited evidence on its clinimetric properties in COPD. We assessed the test-retest reliability and validity of the IPAQ-sf in patients with COPD. Fifty-five participants (68.6±7.8yrs, 48 males, FEV1 52.3±22.5%pred) completed the IPAQ-sf, wore an accelerometer for 7 days and completed a second IPAQ-sf. Test-retest reliability/agreement was assessed with: Intraclass Correlation (ICC, 95%CI), 95% Limits of Agreement (LoA), standard error of measurement (SEM) and minimal detectable change (MDC95) for continuous variables; %agreement for categories (“active” vs “inactive”). Validity was assessed with Spearman’s correlations (ρ) between the IPAQ-sf (METs-min/week, time in vigorous [VPA] and moderate PA [MPA] per week) and accelerometry [time in MVPA, VPA and MPA per week] for continuous variables; %agreement, Cohen’s kappa, sensitivity and specificity (95%CI) for categories. Reliability was acceptable (ICC=0.738, 0.629→0.873) but with wide LoA (-5713→4793.3 METs-min/week). SEM and MDC95 were 1844.7 and 5113.3 METs-min/week, respectively. %agreement of the two IPAQ-sf was 85.5% (kappa=0.660, 0.444→0.876). Significant correlations were found between METsmin/week and accelerometry (0.515≤ρ≤0.596), except for VPA (p>0.05). %agreement between tools was 67.3% (kappa=0.350, 0.279→0.571) with high sensitivity (0.89, 0.887→0.891) but low specificity (0.46, 0.46→0.47). The IPAQ-sf could be used as PA measurement tool in COPD although caution is needed to avoid misclassification.
- Motivos para a Prática de Atividade Física e Atividade Física Atual em pessoas com DPOCPublication . Pimenta, Sara; Raposo, João; Alves-Guerreiro, José; Flora, Sofia; Caceiro, Rúben; Morais, Nuno; Oliveira, Ana; Silva, Cândida G.; Valente, Carla; Andrade, L; Raínho, André; Martins, Vitória; Marques, Alda; Cruz, JoanaIntrodução e objetivos: A inatividade física está associada a um maior risco de exacerbações, hospitalizações e mortalidade em pessoas com doença pulmonar obstrutiva crónica (DPOC). A motivação é um dos fatores-chave para a adoção de um estilo de vida mais ativo. Porém, os motivos para a prática de atividade física (AF) em pessoas com DPOC têm sido pouco estudados, embora sejam relevantes para o desenvolvimento de intervenções de promoção de AF efetivas e sustentáveis. Assim, exploraram-se os motivos para o exercício que as pessoas com DPOC valorizam e a sua relação com a AF atual. Material e Métodos: Realizou-se um estudo observacional transversal em pessoas com DPOC clinicamente estáveis recrutadas em 4 hospitais e 1 centro de saúde. Os motivos para o exercício foram avaliados através do Exercise Motivation Inventory – 2 (EMI-2; 5 dimensões e 14 fatores motivacionais; valores mais altos correspondem a motivos mais valorizados). O comportamento atual de AF foi avaliado através de acelerometria [ActiGraph GT3X+; duração (min/dia) em AF ligeira e moderada-a-vigorosa (AFMV), n.º passos/dia]. Foram usadas medidas de estatística descritiva e correlação de Spearman para avaliar a relação entre os dados do EMI-2 e de acelerometria. Resultados: Foram incluídos 79 participantes (67,4±8,2 anos; 82,3% homens; 43,3% GOLD 3). O fator motivacional mais pontuado foi “manter-se saudável” (mediana [Q1-Q3] 4,7 [3,3–5]) e o que obteve um menor valor foi o “reconhecimento social” (0,8 [0–2,8]). Relativamente às dimensões, os “Motivos de Saúde” 4,1 [3,1–4,7] foram os mais valorizados. Em média, os participantes realizaram 5365,1±3239,1 passos/dia, despenderam 133,6±72,5 min/dia em AF ligeira e 30,5±25,6 min/dia em AFMV. As correlações entre a AF e os fatores e dimensões motivacionais do EMI-2 não apresentaram significância estatística (ρ≤0,194, p>0,05). Conclusões: Embora as pessoas com DPOC valorizem motivos relacionados com a dimensão “saúde”, nenhum dos fatores motivacionais se correlacionou fortemente com a AF atual. Os resultados realçam a natureza multifatorial e complexa da AF e a necessidade de explorar a relação de outros fatores na motivação e AF desta população.
- COPD profiles and treatable traits using minimal resources: Identification, decision tree and longitudinal stabilityPublication . Marques, Alda; Souto-Miranda, Sara; Machado, Ana; Oliveira, Ana; Jácome, Cristina; Cruz, Joana; Enes, Vera; Afreixo, Vera; Martins, Vitória; Andrade, L; Valente, Carla; Ferreira, Diva; Simão, Paula; Brooks, Dina; TavaresBackground: Chronic obstructive pulmonary disease (COPD) is highly heterogeneous and complex. Hence, personalising assessments and treatments to this population across different settings and available resources imposes challenges and debate. Research efforts have been made to identify clinical phenotypes or profiles for prognostic and therapeutic purposes. Nevertheless, such profiles often do not describe treatable traits, focus on complex physiological/pulmonary measures which are frequently not available across settings, lack validation and/or their stability over time is unknown. Objective: To identify profiles and their treatable traits based on simple and meaningful measures; to develop and validate a profile decision tree; and to explore profiles’ stability over time in people with COPD. Methods: An observational, prospective study was conducted with people with COPD. Clinical characteristics, lung function, symptoms, impact of the disease (COPD assessment test–CAT), health-related quality of life, physical activity, lower-limb muscle strength and functional status were collected cross-sectionally and a subsample was followed-up monthly over six months. A principal component analysis and a clustering procedure with k-medoids were applied to identify profiles. Pulmonary and extrapulmonary (i.e., physical, symptoms and health status, and behavioural/life-style risk factors) treatable traits were identified in each profile based on the established cut-offs for each measure available in the literature. The decision tree was developed with 70% and validated with 30% of the sample, cross-sectionally. Agreement between the profile predicted by the decision tree and the profile defined by the clustering procedure was determined using Cohen’s Kappa. Stability was explored over time with a stability score defined as the percentage ratio between the number of timepoints that a participant was classified in the same profile (most frequent profile for that participant) and the total number of timepoints (i.e., 6). Results: 352 people with COPD (67.4±9.9 years; 78.1% male; FEV1=56.2±20.6% predicted) participated and 90 (67.6±8.9 years; 85.6% male; FEV1=52.1±19.9% predicted) were followed-up. Four profiles were identified with distinct treatable traits. The decision tree was composed by the CAT, age and FEV1% predicted and had an agreement of 71.7% (Cohen’s Kappa=0.62, p<0.001) with the actual profiles. 48.9% of participants remained in the same profile whilst 51.1% moved between two (47.8%) and three (3.3%) profiles over time. The overall stability of profiles was 86.8±15%. Conclusion: Profiles and treatable traits can be identified in people with COPD with simple and meaningful measures possibly available even in minimal-resource settings. Regular assessments are recommended as people with COPD may change profile over time and hence their needs of personalised treatment.