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The benefits of living and training at altitude (HiHi) for an improved altitude performance of athletes are clear, but controlled studies for an improved sea-level performance are controversial. The reasons for not having a positive effect of HiHi include: (1) the acclimatization effect may have been insufficient for elite athletes to stimulate an increase in red cell mass/haemoglobin mass because of too low an altitude (<2000-2200 m) and/or too short an altitude training period (<3-4 weeks); (2) the training effect at altitude may have been compromised due to insufficient training stimuli for enhancing the function of the neuromuscular and cardiovascular systems; and (3) enhanced stress with possible overtraining symptoms and an increased frequency of infections. Moreover, the effects of hypoxia in the brain may influence both training intensity and physiological responses during training at altitude. Thus, interrupting hypoxic exposure by training in normoxia may be a key factor in avoiding or minimizing the noxious effects that are known to occur in chronic hypoxia. When comparing HiHi and HiLo (living high and training low), it is obvious that both can induce a positive acclimatization effect and increase the oxygen transport capacity of blood, at least in 'responders', if certain prerequisites are met. The minimum dose to attain a haematological acclimatization effect is >12 h a day for at least 3 weeks at an altitude or simulated altitude of 2100-2500 m. Exposure to hypoxia appears to have some positive transfer effects on subsequent training in normoxia during and after HiLo. The increased oxygen transport capacity of blood allows training at higher intensity during and after HiLo in subsequent normoxia, thereby increasing the potential to improve some neuromuscular and cardiovascular determinants of endurance performance. The effects of hypoxic training and intermittent short-term severe hypoxia at rest are not yet clear and they require further study. 相似文献
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In the face of America’s obesity epidemic, mobile health applications (MHAs) offer solutions for motivating users to be healthier. MHAs include both personal features for the individual user (e.g., calorie tracking) and social features, which connect the user to others (e.g., for support or competition). The present study explores the connection between both personal and social uses of MHAs and healthy behaviors. Findings indicate that the use of MHAs is positively associated with healthier overall behaviors: Personal aspects were related to healthier eating and workout behaviors, and social aspects were positively associated with only healthier workout behaviors. Perceptions of social support from others predicted healthier overall behaviors and were related to increased body satisfaction. Implications for the role of social support in MHAs are discussed. 相似文献
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Participation in job-related lifelong learning among well-educated employees in the Nordic countries
The purpose of this study was to explore participation in job-related lifelong learning (LLL) among well-educated mature workers and compare it across four Nordic countries. Although this group generally is very active in LLL, the centrality of knowledge work in society, rapid pace of skills-renewal and rising learning demands for all qualifications levels, necessitates a better understanding of the patterns and factors affecting their skill development. The paper builds on theories of learning motivation, human capital and workplace learning. Data from the Survey of Adult Skills (PIAAC) by the OECD were used. In addition to high participation rates, systematic level differences in participation were found across the countries. Results of logit regression analyses revealed clear differences between countries in the models that explained participation, which gave limited support to a single ‘Nordic model’ of LLL. Furthermore, the predictors of participation commonly found among adult populations, low-educated individuals and/or younger adults, appeared less valid for well-educated individuals. 相似文献
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Pyhältö Kirsi Pietarinen Janne Haverinen Kaisa Tikkanen Lotta Soini Tiina 《European Journal of Psychology of Education - EJPE》2021,36(1):219-242
European Journal of Psychology of Education - Teacher burnout has been identified as a significant occupational hazard. However, our understanding about individual variations in burnout risk among... 相似文献
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Altitude and endurance training 总被引：4，自引：0，他引：4
The benefits of living and training at altitude (HiHi) for an improved altitude performance of athletes are clear, but controlled studies for an improved sea-level performance are controversial. The reasons for not having a positive effect of HiHi include: (1) the acclimatization effect may have been insufficient for elite athletes to stimulate an increase in red cell mass/haemoglobin mass because of too low an altitude (< 2000-2200 m) and/or too short an altitude training period (<3-4 weeks); (2) the training effect at altitude may have been compromised due to insufficient training stimuli for enhancing the function of the neuromuscular and cardiovascular systems; and (3) enhanced stress with possible overtraining symptoms and an increased frequency of infections. Moreover, the effects of hypoxia in the brain may influence both training intensity and physiological responses during training at altitude. Thus, interrupting hypoxic exposure by training in normoxia may be a key factor in avoiding or minimizing the noxious effects that are known to occur in chronic hypoxia. When comparing HiHi and HiLo (living high and training low), it is obvious that both can induce a positive acclimatization effect and increase the oxygen transport capacity of blood, at least in 'responders', if certain prerequisites are met. The minimum dose to attain a haematological acclimatization effect is > 12 h a day for at least 3 weeks at an altitude or simulated altitude of 2100-2500 m. Exposure to hypoxia appears to have some positive transfer effects on subsequent training in normoxia during and after HiLo. The increased oxygen transport capacity of blood allows training at higher intensity during and after HiLo in subsequent normoxia, thereby increasing the potential to improve some neuromuscular and cardiovascular determinants of endurance performance. The effects of hypoxic training and intermittent short-term severe hypoxia at rest are not yet clear and they require further study. 相似文献
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