Nutrition and Sport by Don MacLaren (ed.)

By Don MacLaren (ed.)

This name is directed basically in the direction of overall healthiness care execs outdoor of the us. It addresses the foremost matters in relation to recreation and workout food via making use of a serious overview point of view. activity and workout meals has been acknowledged as an important part of any activities science/studies direction for a few years now. during this e-book, Don Mclaren has obtained jointly a few of the key concerns within the box, written through recognized specialists, to supply a very good activities foodstuff treatise. The chapters specialise in the main parts endemic to any activities foodstuff programme.

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Electronic balances which are now very light, portable and precise have enhanced this method. Most often a record for seven consecutive days is attempted. Advantages. If carried out according to instructions, by subjects willing and able to behave exactly as ‘normal’, it should give as good a quantitative record of intake, in the field, as it is possible to get. Disadvantages. Only literate subjects can take part and only very well motivated subjects will follow all the instructions precisely. A biased sample is almost inevitable.

Needs a well trained interviewer familiar with eating habits of target group. Estimating portion sizes is problematical. Food composition tables are still needed. Memory is known to be a significant problem and whole meals can be ‘forgotten’. Very susceptible to effects of the day, for example if the previous day was the subject’s birthday or they were ill the intake could be very abnormal. Some subjects are much more aware of their eating habits than others; men are notoriously vague. Interviews can include other family members to good effect but this can pose the problem of who to believe if conflicting information is given (when interviewing children I almost invariably believe children rather than parents in such cases).

Can be used on very large samples and data inputting can be automated. Disadvantages. Not designed to estimate nutrient intakes. Of very limited use if working with individuals. Establishing portion size It would seem axiomatic that in order to estimate the amount of food consumed measurements must be taken. This is the basis of the weighed inventory method but experience has revealed that this is associated with three major problems: (i) distortion of intake, (ii) increasingly, situations when weighing food is impossible, and (iii) careful studies (using biomarkers) have shown that the data obtained are not necessarily more precise than those obtained from non-weighed methods.

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