Browsing by Author "Lambert, M I"

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    Age-related decrements in cycling and running performance
    (2004) St Clair Gibson, A; Lambert, M I; Noakes, T D
    Objective. This study examined age-related decrements in athletic performance during running and cycling activities. Design. The age group winning times for males aged between 18 and 70 years competing in the 1999 Argus cycle tour (103 km) and 1999 Comrades running marathon (90 km), South Africa's premier endurance cycling and running events respectively, were examined. Main outcome measures. The relationship between speed (cycling and running respectively) and age was calculated using a 4th order polynomial function. The derivative of each of these functions was determined and then the slope of the function corresponding to each age was calculated. Results. The rate of decline in running speed occurred at an earlier age (~ 32 years) during the running race compared with the cycling tour (~ 55 years). Conclusions. These findings establish a trend that there is ‘accelerated' aging during running which can perhaps be attributed to the increased weight-bearing stress on the muscles during running compared with cycling.
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    The effect of musculoskeletal injury on endogenous nandrolone metabolism
    (2003) Kohler, R M N; Lambert, M I
    Bibliography: leaves 55-66.
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    Obesity and overweight in South African primary school children - the Health of the Nation Study
    (2006) Armstrong, M E G; Lambert, M I; Sharwood, K A; Lambert, E V
    Objectives. To determine the prevalence of overweight and obesity in a sample of South African children aged 6 - 13 years. Design. Random sampling of schools within each provincial and socio-economic category. Setting. Primary school children from 5 South African provinces. Subjects. 10 195 (5 611 male and 4 584 female) primary school children. Outcome measure. Height and weight were measured and body mass index (BMI) (weight (kg)/height (m)2 ) was calculated for each grouping (age x gender x ethnic group). Cut-off points for BMI defining obese and overweight for gender and age (6 - 13 years) were calculated in accordance with international standards. Results. There were significant differences in height and mass between the different ethnic groups and genders. This trend was not evident for the BMI values. The prevalence of obesity within the sample was 3.2% for boys and 4.9% for girls, whereas overweight prevalence was 14.0% for boys and 17.9% for girls. When the contribution of each ethnic group was adjusted to the demographics of South Africa these values were only slightly different. The prevalence of obesity and overweight among boys was 2.4% and 10.9% respectively, while obese and overweight girls comprised 4.8% and 17.5%, respectively. Conclusions. South African children show trends of obesity and overweight, similar to values in developed countries about 10 years ago. Intervention strategies to combat an increasingly sedentary lifestyle may need to be developed for the South African context.