BONE MASS BY QUANTITATIVE ULTRASOUND OF FINGER PHALANGES IN YOUNG KARATE PRACTITIONERS.

Camila Justino De Oliveira Barbeta,Roberto Ribeiro,Gil Guerra-Júnior,Keila Donassolo Santos Ribeiro,Ezequiel Moreira Gonçalves,Everton Paulo Roman

doi:10.1590/1984-0462/;2017;35;4;00003

Camila Justino De Oliveira Barbeta, Roberto Ribeiro + Show 4 more

Open Access

https://doi.org/10.1590/1984-0462/;2017;35;4;00003

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Abstract

ABSTRACTObjective: To evaluate bone mass by quantitative ultrasound of the phalanges in young karate practitioners compared to a control group. Methods: Sample composed of 162 karate practitioners (52 females) and 326 healthy controls (110 females) aged 6 to 16 years old, in Western Paraná (Southern Brazil). Weight, height, BMI, amplitude-dependent speed of sound (AD-SoS) and bone transmission time (BTT) were evaluated. BMI, AD-SoS and BTT values were converted to Z scores. Mann-Whitney, chi-square or Fisher Exact tests and multiple linear regression were applied, with significance level set at p≤0.05.Results: Both genders showed higher values of BTT as Z scores when compared to control group. Females from the control group had higher AD-SoS values (m/s and Z score) compared to female karate practitioners. When relative and absolute frequencies were assessed according to BTT Z score in both groups, male karate practitioners’ bone mass was shown to be adequate more frequently. In female practitioners, age and weight were independent predictors of AD-SoS (R2=0.42) and BTT (R2=0.45), respectively. Among male karate practitioners, age was related to 26% of AD-SoS variances and height was responsible for 36% of BTT variances.Conclusions: Children and adolescents who practice karate were shown to have more bone mass in comparison to the control group, regardless of gender. BTT was more sensitive for this evaluation.

Highlights

IntroductionKarate[6], a high-impact sport, is the most popular martial art in the world, practiced by children, adolescents, adults, and the elderly.[12] It involves basic techniques such as kicks, punches, and blocks (offensive and defensive) divided into two styles: Kata (imaginary fight) and Kumite (combat).[13] The modality engages several muscle groups with complex movements and fast accelerations and decelerations.[14] The short-duration attack and defense techniques are characterized by execution in maximum intensity with short intervals, which makes it comparable to an intermittent and intense exercise.[14]
Female karate practitioners had higher body mass index (BMI) and bone transmission time (BTT) Z scores when compared to controls; Control group, on its turn, had superior AD-SoS and AD-SoS Z scores
Male karate subjects had normal bone mass more commonly, as shown by BTT Z score when compared to same-gender subjects in control group (Table 2)

Summary

Introduction

Karate[6], a high-impact sport, is the most popular martial art in the world, practiced by children, adolescents, adults, and the elderly.[12] It involves basic techniques such as kicks, punches, and blocks (offensive and defensive) divided into two styles: Kata (imaginary fight) and Kumite (combat).[13] The modality engages several muscle groups with complex movements and fast accelerations and decelerations.[14] The short-duration attack and defense techniques are characterized by execution in maximum intensity with short intervals, which makes it comparable to an intermittent and intense exercise.[14]

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Conclusion