Do fitness and fatigue affect gait biomechanics in overweight and obese children?

Fatigue Perception in Adolescents with Obesity and Their Caregivers

Although fatigue is a frequently occurring symptom in young patients with obesity, relatively few studies have assessed their perception of fatigue and its impact on their quality of life so far. Comparisons between the reports of fatigue in children/adolescents with obesity and their parents were assessed using the Pediatric Quality of Life Inventory-Multidimensional Fatigue Scale (PedsQL-MFS). One hundred Italian children/adolescents (36 males; 64 females), aged between 11 and 17 (mean age = 15.3; SD = 1.61) with severe obesity [mean Body Mass Index (BMI: kg/m²) = 38; SD = 5.48] and their caregivers were enrolled. Perception of fatigue did not change by sex and rates of obesity in adolescents, while there was a difference (p = 0.040) in parents' reports of cognitive fatigue between parents of children/adolescents of Group 1 (BMI SDS 2-2.99) and Group 2 (BMI SDS > 3), with a higher perception of fatigue in parents of the less heavy obese children. Significant differences in reports of general fatigue subscale were found between children/adolescents and their parents, being higher in their parents than in the young subjects with obesity (p < 0.001). Significant moderate correlations between all the subscales of PedsQL-MFS for children and parents were found with Pearson's coefficients ranging from 0.529 to 0.571 (p < 0.001). The perception of fatigue measured with the PedsQL-MFS was comparable between obese children and their parents, thus indicating that this symptom is not hidden by children and is clearly perceived by their parents.

Pediatric quality of life multidimensional fatigue scale (PedsQL-MFS) detects the effects of a 3-week Inpatient body weight reduction program for children and adolescents with obesity

BACKGROUND

Fatigue is a frequent complaint amongst children and adolescents with obesity, and it interferes with adherence to dietary and exercise regimes that could reduce obesity. The present study evaluated the effect of an inpatient 3-week body weight reduction program on body weight and fatigue.

METHOD

One hundred children and adolescents with obesity (64% female; aged 11-18 years) undertook an inpatient program of personalized diet, daily exercise, education, and counselling.

RESULTS

The sample evidenced a mean reduction in body mass (females: ΔM = 4.3 (sd = 2.1) kg, p < .001), males: ΔM = 6.2 (sd = 2.6) kg, p < .001), BMI standard deviation score (females: ΔM = 0.17 (sd = 0.07), males: ΔM = 0.24 (sd = 0.08), p < .001) and fatigue (females: ΔM = 7.8 (sd = 9.7), males: ΔM = 5.0 (sd = 6.9), p < .001) as measured by the Pediatric Quality of Life Multidimensional Fatigue Scale (PedsQL-MFS) and improvements on the Attention problems subscale of the Youth Self Report (total sample: ΔM = 0.89 (sd = 2.44), p < .001). Reliable change analyses revealed fatigue changes were achieved by up to 34% females and 17% males, but the majority did not achieve reliable change and changes in fatigue were not correlated with changes in body mass.

CONCLUSIONS

The program achieved clinically significant improvements in some children and adolescents. Future studies should explore predictors of treatment responsiveness. Trial registration Observational study. Not registered.

The effects of adiposity, muscular strength, cardiorespiratory fitness, and fatigue on gait biomechanics in overweight and obese children

BACKGROUND

Obesity rates continue to increase in the child population. Muscular strength, cardiorespiratory fitness, and fatigue can potentially affect joint stresses in obese children. The purposes are to examine: (1) the relationship between cardiorespiratory fitness and the change in joint stress pre- to post-fatigue; (2) the predictive value of fitness, adiposity, and muscular strength on joint stresses in fatigued and non-fatigued states; and, (3) the relationships between % body fat from skinfold and air displacement plethysmography.

METHODS

Twenty-seven children, with body mass index above the 85th percentile for their age participated in this study. Lower limb joint moments were recorded before and after a fatiguing Progressive Aerobic Cardiovascular Endurance Run protocol. Linear regression was used to assess the relationship between (1) fitness and change in joint stress pre- to post-fatigue, and (2) measures of %body fat using skinfold and plethysmography. Furthermore, Bland-Altman analysis quantified the agreement between measured adiposity using the two methods.

FINDINGS

The strongest relationship was observed between fitness and the change in the knee extensor moment pre- to post-fatigue (R² = 0.24). Regardless of fatigue state, adiposity and strength were identified as the strongest predictors of joint moments. Skinfold estimates were moderately predictive (R² = 0.56) of %body fat from air displacement plethysmography, and these two measures demonstrated instrument agreement with no proportional bias.

INTERPRETATION

Fitness level is not related to changes in biomechanics pre- to post-fatigue in overweight and obese children. Adiposity and lower extremity strength most strongly influenced joint moments in the frontal and sagittal planes.