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Comparing handgrip strength between judokas and non-judokas using population-based normative values

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Abstract

Purpose

Recently, a novel index (HGSindex) was proposed to compare the handgrip strength (HGS) within and between judokas and non-judokas considering the body mass (BM). However, some studies consider body height (BH) as the most appropriate parameter. So, the aims of the present study were as follows: (1) determine which variable (BM or BH) provides a better normalization of the HGS in groups of judokas and non-judokas and (2) evaluate the HGS of these groups using the HGSindex based on normative values.

Method

Participants were 84 male judoka (JM), 25 female judoka (JF), and 44 nonathlete males (NA). Using allometry, the HGS was normalized and the HGSindex was calculated. Statistical tests evaluated correlations, means, and effect sizes.

Results

The results showed that JM and NA groups exhibited stronger HGS compared to nonathletes expected values, while the JF group showed similar performance. BM and BH were suitable variables for HGS normalization, even if BH did not significantly correlate with HGS in the JF group. Furthermore, normalizing HGS for BM removed the BH effect, but not vice versa. Individual HGSindex varied within the groups, ranging from superior to inferior. On average, the JM group had superior performance (HGSindex = 19.32%), while the JF (HGSindex = 6.19%) and NA (HGSindex = 13.61%) groups were classified as mean superior.

Conclusion

The BM seems to be the best variable to normalize the HGS of the participants. The HGSindex proved to be a suitable tool, allowing for comparisons between groups that would not be possible with traditional allometric technique.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

BM:

Body mass

BH:

Body height

HGS:

Handgrip strength

HGSindex:

Handgrip strength index

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WK was responsible for conception, design, text writing, data analysis and interpretation, and statistical analysis. RLK was responsible for conception, design, data collection, and text writing. JS, DHK, and JAD were responsible for design, text writing, and statistical analysis. RC was responsible for design, text writing, and data collection. JDP and DD were responsible for data collection, data analysis, and critical revision.

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Correspondence to Jonathan Ache-Dias.

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Külkamp, W., Kons, R.L., de Souza, J. et al. Comparing handgrip strength between judokas and non-judokas using population-based normative values. Sport Sci Health (2023). https://doi.org/10.1007/s11332-023-01151-y

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