Background. Appropriate physical fitness components and body composition are required to overcome dangerous situations during sea rescues and in the first line of combat in the Mexican Navy.Aim of the study. To analyze the impact of body composition on physical fitness components such as cardiorespiratarory fitness and muscle strength-resistance of marines, rescue swimmers, and divers of the Mexican Navy classified as overweight.Methods. BC was assessed by two BMI cutoff points (WHO and military) ; body fat percentage and muscle mass percentage, and waist circumference were determined by anthropometry.Cardiorespiratory fitness was assessed by the Course-Navette test and MSR by a 1-minute maximal effort of push-ups, sit-ups, and bench presses.Results. We found significant differences in medians of physical fitness components and body composition among groups (p < 0.001). The WHO and military BMI showed 59 (54%) and 16 (15%) individuals as overweight, respectively. Marine instructors showed the highest percentage of men to be overweight, 24 (41%) (WHO) at the expense of good muscle mass percentage but high body fat percentage according to age. All groups showed cardiorespiratory fitness adequate for their age, but only 26 (51%) and 14 (24%) classified as normal and overweight (WHO), respectively, had good cardiorespiratory fitness (p = 0.003).Conclusions. Personnel classified as overweight had good body composition at the expense of high body fat percentage but adequate muscle mass, which could be adequate for their operational tasks; but their cardiorespiratory fitness, although good for their age, is still below the ideal value for military physical activity. BackgroundOverweight, obesity, and inadequate physical fitness in active naval personnel are critical variables that impact directly on the health and wellbeing of service members, military readiness, and the costs associated with medical care and early attrition. The objective of the admission process of civilians to naval discipline is to select recruits that can meet the body composition and physical fitness
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