What This Means
This 12-week randomized trial in 40 adolescents aged 11-14 compared playing recreational beach tennis twice a week with playing beach tennis plus weekly nutritional counseling. About 45% of participants were overweight or obese. Researchers measured blood fats, blood sugar, insulin, blood pressure, and body composition before and after the program.
Both groups had higher levels of HDL ("good") cholesterol, with no difference between them. However, only the group that also received nutritional counseling had lower fasting blood glucose, and this group showed greater improvements in triglycerides, waist circumference, body fat percentage, and systolic blood pressure. LDL cholesterol, total cholesterol, and insulin did not change significantly in either group.
This research suggests that a fun, recreational sport can help some heart and metabolic health markers in young people, and that pairing it with nutrition guidance may bring wider benefits. The study was small and short, so the findings should be seen as preliminary and need confirmation in larger, longer trials.