Comprehensive evaluation of sports bra function based on objective weighting method
Single function evaluation on bra does not cater for women's comprehensive requirements for sports bras during exercise.Although comprehensive evaluation on thermal function of bra has been documented,breast movement reduction and dynamic pressure comfort,as two of the most representative functions of sports bra,have not been reported to be included into the comprehensive evaluation on sports bra function.This study aimed to explore a comprehensive evaluation method for sports bra function.A subjective evaluation experiment was also conducted to verify the validity and feasibility of the results.Taking function as the starting point,the article established a comprehensive evaluation system for the function of sports bra by considering the shocking-proof function,pressure comfort and heat and humidity comfort of sports bra and choosing the four representative indexes of displacement,pressure,air permeability and moisture permeability,respectively.The participants were five C-cup women,and the experimental sports bras were seven sports bras.The participants wore the seven sports bras in turn and ran on the treadmill at 7.5 km/h and 10.0 km/h respectively.The vertical breast displacement data and cup pressure during running were collected and calculated,and the air permeability and moisture permeability of both cushions of each bra were tested.Entropy method and variation coefficient method were employed to calculate the weight coefficients of various indicators,subsequently deriving comprehensive evaluation values for the seven sports bras.Finally,the feasibility and effectiveness of the objective weighting method in assessing the sports bras function were validated through subjective evaluation experiments.Comprehensive evaluation method for sports bra function used in this study could be categorized into six key steps,which were determining representative parameters,collecting parameter data,normalizing collected data,calculating weight coefficient of each parameter,calculating comprehensive evaluation score for each sports bra and ranking sports bras according to comprehensive evaluation scores.The results show that the weight coefficients of each index obtained by the two methods are consistent when the speed of movement is 10.0 km/h.Through the test of the data of each index of seven sports bras,it is found that the air permeability and moisture permeability of sample clothing 2#were the best,and the displacement is second only to sample clothing 1#;the displacement,pressure and moisture permeability of sample 7#are the worst.According to the comprehensive evaluation of the functional performance of the sports bra,the comprehensive rankings obtained by the entropy method and the coefficient of variation method are consistent,with the order of superiority being 2#,1#,4#,3#,6#,5#,7#.In addition,in the subjective validation experiment,the subjective evaluation results are in agreement with the two objective evaluation ranking results to a large extent.The results demonstrate that the two objective weighting methods are valid and accurate to evaluate the function of sports bra.This study provides two new objective weighting methods for comprehensive evaluation of sports bra function.Both entropy method and variation coefficient method can obtain comprehensive evaluation scores of sports bra function.The evaluation results of the two objective weighting methods during the two running speeds were consistent,and the overall ranking of each sports bra was relatively stable.The results of objective evaluation and subjective evaluation are consistent to a large extent,which verifies the feasibility of the comprehensive evaluation method of sports bra function based on objective weighting method.This finding confirms the notion that objective weighting method is a scientific and rational method to evaluate sports bra function synthetically,which effectively avoids the interference of subjective factors and provides a new direction for product evaluation and optimization.
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