The Relationship Of VO₂max And VO₂ Under Different Running Speeds With Isometric Muscle Strength In 18-45 Years Old Adults

Background:VO₂max and muscle strength are important indicators for general health and physical fitness.However,the relationship between VO₂and muscle strength remains unclear and needs further study to confirm.Objective:To determine the relationship of VO₂max and VO₂under different running speeds with muscle strength in aged 18 to 45 years old men and women.We attempt to enrich the knowledge on the relationship between the VO₂and muscle strength.The purpose is to provide data support for exercise prescriptions and sports training.Methods:This study is a cross-sectional study.In total,132participants were included（men=93,women=39）.The VO₂max and VO₂under different running speeds were measured in a laboratory setting by direct measurement using breath by breath gas analyzer（K4b2）on a treadmill.Muscle strength（hand-grip,leg extensor,leg flexor strength）was measured by isometric dynamometer.Results:In this study,before taking age,lean body mass,weekly exercise hour,and maximal speed as covariate,we found VO₂max was only significantly correlated with leg extensor strength（r=-0.257,p=0.016）in men.In women,VO₂max was only significantly correlated with leg flexor strength（r=0.346,p=0.031）.After taking age,lean body mass,weekly exercise hour,and maximal speed as covariate,we found VO₂max was not significantly correlated with muscle strength in men and women.However,In linear regression analyses,in men,at the running speeds of7km/h-11km/h,total muscle strength（hand-grip strength,leg extensor,leg flexor）accounted for 32%、40%、39%、37%、31%of the variance in VO₂respectively.Leg extensor had a significant effect on the VO₂at（β=-0.05～-0.07,p<0.05）.No significant associations between VO₂under different speeds and muscle strength were found in women.Conclusion:In men,the increased muscle strength could be conducive to the utilization of oxygen during running.In women,no association was found between VO₂max,VO₂under different speeds and muscle strength.