Correlation of body mass index with handgrip strength and blood pressure indices among young adults

Abstract

Objectives: Hand grip strength (HGS) is an important quantitative measure to evaluate the overall muscle strength of an individual. It is affected by factors such as age, sex, body mass index (BMI) and cardiovascular risk factors such as obesity and hypertension. This study aims to find out the correlation of BMI with HGS and blood pressure indices among young adults. Materials and Methods: Three hundred and eighty-two medical students between the age group of 18-20 years with no history of systemic illness, musculoskeletal disorder, hand pain or deformity were selected. Informed consent was obtained. Biodata and anthropometric measurements were documented in a proforma. HGS and endurance of the dominant hand were measured using a hand-held dynamometer. Blood pressure was recorded using a mercury sphygmomanometer. Data on BMI was sub grouped into underweight, normal weight, overweight and obese participants to compare the HGS among them. Results: There was a statistically significant negative correlation between BMI and HGS (r = −0.513; P < 0.01), BMI and grip strength ratio (r = −0.750; P < 0.01), and between BMI and handgrip endurance (r = −0.359; P < 0.01). Statistically significant decrease in HGS was found among underweight (29.36 ± 7.01), overweight (26.18 ± 5.45) and obese participants (20.48 ± 3.12) with Kruskal-Wallis value χ2 = 14.231. Furthermore, a statistically significant positive correlation was found between BMI and systolic blood pressure (r = 0.603; P < 0.01), BMI and diastolic blood pressure (r = 0.514; P < 0.01), BMI and pulse pressure (r = 0.228; P < 0.01) and between BMI and mean arterial pressure (r = 0.572; P < 0.01). Conclusion: BMI was found to be negatively correlated with HGS and positively correlated with blood pressure indices. This can influence the compatibility of medical students with the physical and emotional stress of course. Determinants such as grip span, hand span, skeletal muscle bulk, and arm and calf muscle circumference are to be considered for further research to improve the endurance of young adults.