How Birth Weight Affects Adult Grip Strength
Author Information
Author(s): Charlotte L. Ridgway, Stephen J. Sharp, Catherine Derom, Gaston Beunen, Robert Fagard, Robert Vlietinck, Ulf Ekelund, Ruth J. F. Loos
Primary Institution: MRC Epidemiology Unit, Institute of Metabolic Science, Cambridge, United Kingdom
Hypothesis
The heaviest twin at birth will have greater adult hand grip strength and increased fat free mass compared to their lighter sibling.
Conclusion
Higher birth weight is associated with greater adult hand grip strength, which is mediated through greater adult fat free mass.
Supporting Evidence
- Birth weight was positively associated with hand grip strength.
- The association between birth weight and adult grip strength was stronger in dizygotic men than in monozygotic men.
- Higher birth weight was associated with increased fat free mass.
Takeaway
If a baby is born heavier, they are likely to be stronger as an adult. This strength comes from having more muscle.
Methodology
The study used a twin pair approach to analyze the relationship between birth weight and adult grip strength, including both individual and within-pair analyses.
Potential Biases
The use of bio-electrical impedance to estimate fat-free mass may not be as accurate as other methods.
Limitations
The study may be underpowered for detecting associations due to the smaller range of within-pair differences in birth weight.
Participant Demographics
Participants were young adults aged 18-34 years, including 382 men and 401 women.
Statistical Information
P-Value
p<0.001
Confidence Interval
95% CI 1.52, 3.67
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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