Normative values and prediction equations for the modified incremental step test in healthy adults aged 18-83 years.

OBJECTIVE: To establish normative values and reference equations for predicting the number of steps and oxygen consumption (VO2) from the modified incremental step test (MIST) in healthy adults aged 18-83 years. DESIGN: Prospective observational study. PARTICIPANTS: One hundred and ninety-four healthy adults aged 18-83 years with normal spirometry. SETTINGS: Exercise physiology laboratory of a university. METHODS: Participants underwent two MISTs (30 minutes apart). The MIST was performed on a 20-cm-high step using an externally paced rhythm imposed by audible signals, starting with 10 steps per minute and with constant increments of 1 step every 30 seconds. MAIN OUTCOMES: Number of steps and VO2 obtained from MIST. RESULTS: Normative values were provided for males and females for each age group. The following equations were determined: number of steps = 675.113 + (66.165*sex, 0 female and 1 male) - (5.353*age) - (6.593*body mass index) (R² =0.44, P < 0.001); VO2 = 0.106 + (0.216*sex, 0 female and 1 male) - (0.008*age [years]) + (0.021*weight [kilograms]) + (0.001*number of steps) (R² =0.80, P < 0.001). CONCLUSION: Normative values and prediction equations are proposed for the number of steps and VO2 which can be used to interpret performance on the MIST in individuals with different health conditions. These equations now need validation in other samples.

Validity, Reproducibility, and Minimal Detectable Difference of the Functional Upper Extremity Function Test - Simplified Version - for Adults With Moderate to Severe Asthma and COPD.

BACKGROUND: Upper-limbs (ULs) functional tests which are valid and reliable for individuals with chronic respiratory disease (CRD) are scarce. The aim of this study was to investigate the intra-rater reproducibility, validity, minimal detectable difference (MDD), and learning effect of the Upper Extremity Function Test - simplified version (UEFT_S) functional test and to characterize its performance for adults with moderate-severe asthma and COPD. METHODS: The UEFT_S was performed twice, and the number of elbow flexions in 20 s was the outcome. In addition, spirometry, 6-min walk test (6MWT), handgrip dynamometry (HGD), and usual and maximum timed-up-and-go tests (TUG_usual and TUG_max) were also performed. RESULTS: Eighty-four individuals with moderate-severe CRD and 84 control individuals matched by anthropometric data were analyzed. Individuals with CRD presented better performance in the UEFT_S than controls (P = .023). UEFT_S correlated significantly with HGD, TUG_usual, TUG_max, and 6MWT (P < .047 for all). The test-retest intraclass correlation coefficient was 0.91 [0.86-0.94], and the MDD was 0.4%. CONCLUSIONS: The UEFT_S is a valid and reproducible tool to assess the functionality of the ULs in people with moderate-severe asthma and COPD. When applied in the modified form, the test can be considered simple, fast, and inexpensive, with an easy outcome to interpret.

Do Functional Tests Estimate Physical Activity in COPD?

The association between physical activity in daily life (PADL) and simple functional tests is not yet clearly understood in subjects with chronic obstructive pulmonary disease (COPD). Therefore, the aim of this study was to investigate the association of two functional tests (Sit-to-Stand test [STS] and the 4-Metre Gait Speed test [4MGS]) with PADL, as well as to identify whether these tests can discriminate those subjects who are physically inactive. In this cross-sectional study, 28 subjects with COPD performed the five repetitions Sit-to-Stand (STS5r), the 4MGS and used the DynaPort activity monitor for 7 days in order to assess PADL. Walking time, movement intensity while walking (MI) and Physical Activity Level index (PAL) were considered as PADL outcomes. STS5r and 4MGS, respectively, were significantly associated with walking time (R2 = 0.16; p = 0.024 and R2 = 0.25; p = 0.006) and PAL index (R2 = 0.17; p = 0.002 and R2 = 0.30; p = 0.003), whereas movement intensity was associated only with the 4MGS (R2 = 0.23; p = 0.009). Additionally, both tests were able to discriminate physically inactive subjects (cutoffs: STS5r = 11.48s [AUC = 0.73]; 4MGS = 1.09m/s [AUC = 0.88]). In conclusion, STS5r and 4MGS can predict up to 30% of PADL in subjects with COPD. Both tests are related to PADL duration (e.g. time spent walking), while only the 4MGS reflects movement intensity. Both tests presented discriminative capacity to identify subjects with worse PADL pattern.

Do simple and quick functional tests reflect a more comprehensive test or physical activity in daily life in healthy young subjects? / Testes funcionais simples e rápidos refletem um teste mais abrangente ou atividade física na vida diária em jovens saudáveis? / ¿Los tests funcionales simples y rápidos reflejan un test más completo o actividad física en la vida diaria en jóvenes sanos?

ABSTRACT Considering the wide use of functional tests and that faster and simpler evaluations are preferable, this study aimed to verify the association between five protocols of simple functional tests (timed up and go [TUG], four-meter gait speed [4MGS] and sit-to-stand [STS] in five-repetitions [STS5rep], 30-seconds [STS30sec] and one-minute [STS1min] protocols) and the six-minute walk test (6MWT), as well as physical activity in daily life (PADL) in healthy young subjects. In this cross-sectional study, PADL was quantified by a pedometer validated for step counting and we considered the mean of seven consecutive days during the time awake. We assessed functional capacity by the TUG, 4MGS, STS5rep, STS30sec, and STS1min tests and the 6MWT. A total of 79 subjects without lung functional impairments were included (49% male, aged 28 [23-36] years). Performance of simple functional tests correlated with the 6MWT (0.23<r <0.56; P<0.05 for all) and the TUG test showed the best association (R2= 0.34). However, simple functional tests did not correlate with PADL (0.03< r <0.13; P>0.05 for all). The less time-consuming functional tests were weakly-moderately related to the 6MWT in healthy young subjects. The TUG showed the best association and explained up to 34% of the 6MWT. However, the 6MWT cannot be replaced by none of these simple functional tests. Finally, functional capacity showed no association with physical activity in daily life assessed by the pedometers in this population.

RESUMO Considerando o amplo uso de testes funcionais e que avaliações mais rápidas e simples são preferíveis, o objetivo deste estudo foi verificar a associação entre cinco protocolos de testes funcionais, a saber, timed up and go [TUG], 4-meter gait speed [4MGS] and sit to stand [STS] in 5-repetitions [STS5rep], 30-seconds [STS30sec] and 1-minute [STS1min] protocols e o teste de caminhada de 6 minutos (TC6min), bem como com a atividade física na vida diária (AFVD) em jovens saudáveis. Neste estudo transversal, a AFVD foi quantificada por um pedômetro validado para contagem de passos, e a média de sete dias consecutivos durante o tempo acordado foi considerada. A capacidade funcional foi avaliada pelo TUG, 4MGS, STS5rep, STS30sec, STS1min e TC6min. 79 pessoas sem comprometimento pulmonar foram incluídas (49% homens, idade média de 28 anos). O desempenho nos testes funcionais correlacionou-se com o TC6min (0,23< r <0,56; p<0,05 para todos) e o TUG apresentou a melhor associação (R²=0,34). Entretanto, os testes funcionais simples não se correlacionaram com a AFVD (0,03<r<0,13; p>0,05 para todos). Os testes funcionais de curta duração foram fracos, moderadamente relacionados ao TC6min em jovens saudáveis. O TUG apresentou a melhor associação e explicou até 34% do TC6min; no entanto, este não pode ser substituído por nenhum dos testes funcionais simples. Por fim, a capacidade funcional não se relacionou com a atividade física na vida diária avaliada pelos pedômetros nessa população.

RESUMEN Teniendo en cuenta el amplio uso de los tests funcionales y que son preferibles evaluaciones más rápidas y sencillas, el objetivo de este estudio fue verificar la asociación entre cinco protocolos de tests funcionales, a saber, timed up and go [TUG], 4-meter gait speed [4MGS] and sit to stand [STS] in 5-repetitions [STS5rep], 30-seconds [STS30sec] and 1-minute [STS1min] protocols y la prueba de caminata de 6 minutos (6MWT), con la actividad física de la vida diaria (AFVD) en jóvenes sanos. En este estudio transversal, la AFVD se cuantificó mediante un podómetro validado para el conteo de pasos, y se consideró el promedio de siete días consecutivos durante el tiempo acordado. La capacidad funcional se evaluó mediante TUG, 4MGS, STS5rep, STS30sec, STS1min y 6MWT. Se incluyeron a 79 personas sin afectación pulmonar (49% hombres, edad media 28 años). El desempeño en los tests funcionales se correlacionó con la 6MWT (0,23< r <0,56; p<0,05 para todos), y el TUG tuvo la mejor asociación (R²=0,34). Sin embargo, los tests funcionales simples no se correlacionaron con la AFVD (0,03<r<0,13; p>0,05 para todos). Los tests funcionales a corto plazo fueron insuficientes, moderadamente relacionados con la 6MWT en jóvenes sanos. El TUG mostró la mejor asociación y explicó hasta el 34% de la 6MWT, pero este no puede reemplazarse por ninguno de los tests funcionales simples. Por último, la capacidad funcional no se relacionó con la actividad física en la vida diaria evaluada por podómetros en esta población.

Fat mass to fat-free mass ratio and its associations with clinical characteristics in asthma.

BACKGROUND: Fat mass to fat-free mass ratio (FM/FFM) assesses the combined effect of the balance between fat mass and fat-free mass. AIMS: to evaluate the associations beetween FM/FFM and clinical outcomes in asthma and to compare clinical characteristics between individuals with higher and lower FM/FFM. METHODS: 128 participants with asthma underwent anthropometric, spirometry and bioelectrical impedance assessments. Physical activity in daily life (PADL) was assessed by the Actigraph for 7 days. Daily dose of inhaled medication, steps of pharmacological treatment, Asthma Control Questionnaire, Asthma Quality of Life Questionnaire and Hospital Anxiety and Depression Scale were also assessed. Participants were classified into two groups according to the 50th percentile of reference values for FM/FFM. RESULTS: Individuals with higher FM/FFM (n=75) used higher daily doses of inhaled corticosteroids, had worse lung function and fewer steps/day when compared to those with lower FM/FFM (n=53) (P≤0.021). Associations were found between absolute values of FM/FFM with lung function (FEV1 and FVC [liters]): R2=0.207 and 0.364;P<0.0001), and between the categories of lower or higher FM/FFM with steps of medication treatment (Cramer's V=0.218;P=0.016) and level of PADL (Cramer's V=0.236;P=0.009). The highest FM/FFM was a determining factor of physical inactivity (OR: 3.21;95%CI:1.17-8.78) and highest steps of pharmacological treatment (OR: 8.89;95%CI:1.23-64.08). CONCLUSION: Higher FM/FFM is significantly associated with worse clinical characteristics in individuals with asthma, such as higher doses of inhaled corticosteroids, worse lung function and fewer steps/day. Moreover, higher FM/FFM is a determining factor of physical inactivity and the highest steps of pharmacological treatment for asthma.

Reference Values for 7 Different Protocols of Simple Functional Tests: A Multicenter Study.

OBJECTIVES: To establish reference values and equations (ages 20-80y) for 7 simple functional tests based on a multicenter study. DESIGN: Cross-sectional data collection in 4 research centers across different regions of a continental dimension country. SETTING: Healthy subjects from general community were assessed in different research laboratories. PARTICIPANTS: Data collection of 296 volunteer subjects (N=296; 45% men; aged 50±18y, forced expiratory volume in the first second 95±13% pred, body mass index 26.9±4.5 kg/m2) aged 20-80 years; representing both sexes; with the ability to understand and perform all proposed assessments; and with no severe and/or unstable condition that could limit functional assessments occurred simultaneously in all centers. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: All participants randomly performed the following 7 functional tests twice: (1) the 4-meter gait speed test at usual walking speed; (2) the 4-meter gait speed test at maximal walking speed; (3) the Sit-to-Stand test performed with 5 repetitions; (4) the Sit-to-Stand test performed in 30 seconds; (5) the Sit-to-Stand test performed in 1 minute; (6) the Timed Up and Go test at usual speed; and (7) the Timed Up and Go test at maximal speed. Spirometry, quality of life, depression, anxiety, physical activity, and comorbidities were also assessed to better characterize the sample. The best performance of each test was used to propose reference values for men and women and reference equations for all. RESULTS: Participants similarly distributed by age groups from the 4 centers were included. All tests were correlated with age (0.34

Pulmonary Function, Functional Exercise Capacity and Quality of Life in Chemical Dependents in Rehabilitation Process / Função Pulmonar, Capacidade Funcional de Exercício e Qualidade de Vida de Dependentes Químicos em Processo de Reabilitação

The use of illicit substances can lead to several changes in physical and mental health, which can directly reflect on functional capacity and quality of life. However, there is a lack in the literature on the comparison of these variables between drug addicts and healthy individuals. To compare lung function, functional exercise capacity and quality of life of chemical dependents in rehabilitation process (CDRP) and apparently healthy individuals (AHI). Cross-sectional study that evaluated two groups (CDRP and AHI) matched by gender, age and BMI. Both groups were assessed for lung function (spirometry), quality of life (Short Form 36 questionnaire - SF-36), functional exercise capacity (6-minute walk test - 6MWT, 4-meter gait speed, Timed up-and-go, Sit-to-Stand and Short Physical Performance Battery). Fifteen men in the CDRP group (31[26-39] years; BMI 23±3 kg/m2) and fifteen men in the AHI group (30[22-34] years; BMI 24±3 kg/m2) were analyzed. The CDRP group had a shorter distance covered in the 6MWT in meters (P=0.0002) and percentage of predicted (P=0.005). There was no difference in the performance of the other functional tests (P≥0.20) and in the pulmonary function (P≥0.46). The CDRP group had worse results in the functional capacity, pain, social aspects and mental health domains of SF-36 (P≤0.04), while in the domains general status, vitality, emotional and physical aspects there was no difference (P≥0.08). CDRP present similar lung function to AHI. However, the first have impaired functionalexercise capacity, as well as some aspects of quality of life. (AU)

O uso de substâncias ilícitas pode levar a diversas alterações da saúde física e mental, o que pode refletir diretamente na capacidade funcional e na qualidade de vida. Porém, há uma escassez na literatura sobre a comparação dessas variáveis entre dependentes químicos e indivíduos saudáveis. Comparar função pulmonar, capacidade funcional de exercício e qualidade de vida de dependentes químicos em processo de reabilitação (DQPR) e indivíduos aparentemente saudáveis (AS). Estudo transversal que avaliou dois grupos (DQPR e AS) pareados por gênero, idade e IMC. Ambos os grupos foram avaliados quanto à função pulmonar (espirometria), qualidade de vida (questionário Short Form 36 ­ SF36), capacidade funcional de exercício (Teste de Caminhada de 6 minutos - TC6, 4-metre gait speed, Timed-up-and-go, Sit-to-Stand e Short Physical Performace Battery). Foram analisados 15 homens no grupo DQPR (31[26-39] anos; IMC 23±3 kg/m2) e 15 homens no grupo AS(30[22-34] anos; IMC 24±3 kg/m2). O grupo DQPR apresentou uma menor distância percorrida no TC6 em metros (P=0,0002) e porcentagem do predito (P=0,005). Não houve diferença no desempenho dos demais testes funcionais (P≥0,20) e na função pulmonar (P≥0,46). O grupo DQPR apresentou piores resultados nos domínios capacidade funcional, dor, aspectos sociais e saúde mental do SF-36 (P≤0,04), enquanto que nos domínios estado geral, vitalidade, aspectos emocionais e físicos não houve diferença (P≥0,08). Homens dependentes químicos em processo de reabilitação apresentam função pulmonar semelhante a indivíduos aparentemente saudáveis. Entretanto, apresentam capacidade funcional de exercício prejudicada, assim como alguns aspectos da qualidade de vida. (AU)