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  • Author: Tania Pereira x
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Tania Pereira, John Durocher and Jamie Burr

Background: Insufficient physical activity (PA) is associated with numerous chronic diseases and premature mortality, and the challenge of meeting recommended PA guidelines is exacerbated in the winter. Snowmobiling can potentially contribute to PA accumulation, but the objective metabolic and physical demands are unclear. The purpose of this study was to assess the physical demands of riding a snowmobile. Methods: Habitual snowmobile riders responded to a survey describing a typical ride (n = 4015). Using this data, terrain-specific testing courses were created, and recreational snowmobile riders (n = 40) participated in a scaled representative ride (21 [8] min) while aerobic metabolism (VO2) and muscular fatigue were quantified. Results: The mean VO2 while riding, irrespective of terrain, was 18.5 (8.4) mL·kg−1·min−1, with significant differences based on geographic location (13.4 [5.2] vs 25.7 [6.6] mL·kg−1·min−1, P < .001). Muscular fatigue was apparent in maximal handgrip (−7% [8%], P < .001) across both riding terrains, but not lower body power, suggesting a greater influence of an upper body strength component. Conclusions: Snowmobiling is an activity that generally falls within the moderate-intensity activity range and involves both aerobic fitness and muscular strength. There were substantial differences in demand between terrains, suggesting that additional benefits may be conferred from mountain riding as it was more metabolically demanding.

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Carla Elane Silva dos Santos, Sofia Wolker Manta, Guilherme Pereira Maximiano, Susana Cararo Confortin, Tânia Rosane Bertoldo Benedetti, Eleonora d’Orsi and Cassiano Ricardo Rech

Background: To examine the level of physical activity and sedentary behavior (SB), measured with accelerometers, in older adults from a city in southern Brazil according to sociodemographic and health characteristics. Methods: The sample consisted of 425 older adults (≥63 y) from the EpiFloripa Aging Study. Light physical activity (LPA), moderate to vigorous physical activity (MVPA), and SB were measured with accelerometers over a period of 7 days. Results: The older adults spent two-thirds of the time of use in SB, one-third in LPA, and only 2.1% (95% confidence interval, 1.8–2.2) in MVPA. In the final adjusted model, lower levels of MVPA were observed for women, as well as higher SB and lower LPA and MVPA for those with higher age. There were also trends toward prolonged SB and lower LPA when participants had a higher educational level and toward lower MVPA with higher body mass index. Conclusions: Constant monitoring of physical activity levels and SB using objective measures is recommended and interventions should be directed at the groups most exposed to excessive SB and low levels of MVPA.

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José Messias Rodrigues da Silva, Marcia Uchoa de Rezende, Tânia Carvalho Spada, Lucila da Silva Francisco, Helenilson Pereira dos Santos, Robson de Andrade Souza, Júlia Maria D'Andréa Greve and Emmanuel Gomes Ciolac

Background: The purpose of this study was to assess the role of physical activity (PA) in muscular and functional capacity in subjects under treatment for knee osteoarthritis submitted to an interdisciplinary educational program emphasizing the regular practice of PA and exercises. Methods: Subjects under treatment for primary knee osteoarthritis (N = 136; age = 66 [3]) were allocated in sedentary to sedentary (SED−SED, sedentary or insufficiently active at pre and post), active to sedentary (ACT−SED, active or very active at pre and sedentary or insufficiently active at post), sedentary to active (SED−ACT, sedentary or insufficiently active at pre and active or very active at post), and active to active (ACT−ACT, active or very active at pre and post) groups. Muscular capacity (isokinetic test), functional capacity (timed up and down stairs test, timed up and go test, and 5 times sit to stand test), and daily living PA (International PA Questionnaire short version) were assessed before and after (12 mo) the follow-up. Results: There were improvements in performance (P < .05) in the time to up and down stairs: 37% in SED–ACT and 27.5% in ACT–ACT; timed up and go test: 33.5% in SED–ACT, 19% in ACT−SED, and 40% in ACT–ACT; 5 times sit to stand test: 39% in SED–ACT and 51% in ACT–ACT groups after 12 months of follow-up. Conclusions: The present results suggest that high levels of daily living PA may have an important role in the prevention/management of knee osteoarthritis.