Comparison of energy expenditure in adolescents when playing new generation and sedentary computer games: cross sectional study

Objective : To compare the energy expenditure of adolescents when playing sedentary and new generation active computer games.

Design : Cross sectional comparison of four computer games.

Setting : Research laboratories.

Participants : Six boys and five girls aged 13-15 years.

Procedure : Participants were fitted with a monitoring device validated to predict energy expenditure. They played four computer games for 15 minutes each. One of the games was sedentary (XBOX 360) and the other three were active (Wii Sports).

Main outcome measure : Predicted energy expenditure, compared using repeated measures analysis of variance.

Results : Mean (standard deviation) predicted energy expenditure when playing Wii Sports bowling (190.6 (22.2) kJ/kg/min), tennis (202.5 (31.5) kJ/kg/min), and boxing (198.1 (33.9) kJ/kg/min) was significantly greater than when playing sedentary games (125.5 (13.7) kJ/kg/min) (P<0.001). Predicted energy expenditure was at least 65.1 (95% confidence interval 47.3 to 82.9) kJ/kg/min greater when playing active rather than sedentary games.

Conclusions : Playing new generation active computer games uses significantly more energy than playing sedentary computer games but not as much energy as playing the sport itself. The energy used when playing active Wii Sports games was not of high enough intensity to contribute towards the recommended daily amount of exercise in children.

New Zealand and its competitors in the knowledge economy

In the US, Australia, the United Kingdom, Canada, Finland, Ireland and other countries, the growth of the Internet and other related new technologies have become the catalyst for the creation of ‘knowledge economies’. The new information and communication technologies have created global markets for goods and services. Countries that have encouraged their people through education and life-long learning and by investing heavily in research and development (R&D) are well positioned to take advantage of these new global markets. Along with globalisation has come the death of distance. Thanks to the Internet, New Zealand is no longer remote from the rest of the world.

But New Zealand’s economy is still too dependent on producing commodities for export. While efforts over the last fifteen years to diversify markets have been very successful, we still need to expand our limited range of products. We must take the next important step and transform New Zealand from a pastoral economy into a knowledge-driven economy. For New Zealand, the Internet is the modern equivalent of the freezer ship that revolutionised our economy last century. If New Zealanders do not seize the opportunities provided by the knowledge economy, we will survive only as an amusement park and holiday land for the citizens of more successful developed economies.

This article puts New Zealand into world perspective by assessing its knowledge economy benchmarks against its competitors. It outlines the theoretical background to ‘‘new growth theory'' and delineates the lessons of that theory, especially for New Zealand. It treats the key issues for New Zealand’s emergence as a knowledge economy, including education, the M ori dimension, immigration, research and development, venture capital, export policy and telecommunications regulation.

Annual high-dose vitamin D3 and mental well-being: randomised controlled trial

Background Epidemiological evidence supports a relationship between vitamin D and mental well-being, although evidence from large-scale placebo-controlled intervention trials is lacking.

Aims To examine if vitamin D supplementation has a beneficial effect on mood in community-dwelling older women; if a single annual large dose of vitamin D has a role in the prevention of depressive symptoms; and if there is an association between serum 25-hydroxyvitamin D levels and mental health.

Method A double-blind, randomised, placebo-controlled trial of women aged 70 or older (the Vital D Study: ISRCTN83409867 and ACTR12605000658617). Participants were randomly assigned to receive 500 000 IU vitamin D3 (cholecalciferol) orally or placebo every autumn/winter for 3–5 consecutive years. The tools utilised at various time points were the General Health Questionnaire, the 12-item Short Form Health Survey, the Patient Global Impression–Improvement scale and the WHO Well-Being Index. Serum 25-hydroxyvitamin D levels were measured in a subset of 102 participants.

Results In this non-clinical population, no significant differences between the vitamin D and placebo groups were detected in any of the measured outcomes of mental health. Serum 25-hydroxyvitamin D levels in the vitamin D group were 41% higher than the placebo group 12 months following their annual dose. Despite this difference, scores from the questionnaires did not differ. Furthermore, there was no interaction between those on antidepressant/anxiety medication at baseline and the treatment groups.

Conclusions The lack of improvement in indices of mental well-being in the vitamin D group does not support the hypothesis that an annual high dose of vitamin D3 is a practical intervention to prevent depressive symptoms in older community-dwelling women.

Tourist benefits research : old and new issues and uses in a cultural tourism context

Benefits sought and gained by tourists are relevant to developing tourist markets for cultural attractions and experiences as this paper will demonstrate. The main objectives of this paper are to identify benefit variables commonly used in tourism marketing, their purpose of use, and associated issues by reviewing existing empirical research of tourism benefits and specifically examining the applications to date in cultural tourism contexts. For the benefits most commonly found in tourist benefit research and of relevance to tourists’ cultural experiences, a benefits typology from the allied area of leisure (Driver & Bruns, 1999) is applied to categorise these benefits and develop a conceptual typology for consideration. Research propositions for future research of tourists’ cultural experiences are also proposed including new uses for benefit variable dimensions.