# Relationships between Anthropometric and Strength Profiles of Streetlifting Athletes
## 4 Discussion  
The aim of this study was to identify the anthropometric profile of streetlifting athletes and to study the relationships between anthropometry, body composition variables and sport-specific strength performance. The results of this study showed that as the weight category increases, the athletes are characterized by increased heights, larger circumferences and greater endomorphic components. This is consistent with previous investigations conducted on competitive powerlifters [3,4,21]. On the contrary, ectomorphy tended to be lower in the heavy-weight categories of both sexes, compared to the lighter categories. According to [PERSON] and colleagues [22,23], mesomorphy tends to remain stable in the different body weight categories of both sexes. Male athletes included in the \(-\)66 kg and \(-\)74 kg categories were characterized by the lowest body fat percentages (7.5-7.7%) and by the highest relative strength in chin-ups (104.8-103.3% of body mass), dips (146.4-150.3% of body mass) and muscle-ups (32.6-38.8% of body mass). On the contrary, the men in the +93 kg body weight category showed the highest body fat percentage (14.2%) and the lowest strength-to-weight ratios in chin-ups (80% of body mass), dips (125% of body mass) and muscle-ups (23.6% of body mass). Similar trends in body fat and relative strength were calculated in the women included in the \(-\)57 kg and \(-\)63 kg categories. This is consistent with other investigations conducted on Olympic weightlifters of both sexes [5,24]. Curiously, the relative strength was similar in the \(-\)69 kg category compared to the \(-\)63 kg body weight category in women. This is probably related to the limited number of women included in this body weight category (n = 3). According to [PERSON] and [PERSON] [25] and [PERSON] and colleagues [26], an excess of body fat may have a negative impact on the pull up performance in both sexes. In addition, both chin-up and muscle-up performance (the latter performed by men only) present similar correlations with anthropometric and body composition parameters. The potential similarity between these exercises partially explains our finding. This is also confirmed by the fact that chin-up performance influenced the variance in the muscle-up performance by 87.6%. In addition, and similarly in both sexes, the tensed and flexed arm girth and AMA were more correlated to dip performance (r = 0.60 and r = 0.64 for tensed and flexed arm girth and AMA, respectively) compared to chest girth (r = 0.41). The regression analysis indeed showed that arm size explains over 50% of the variance in dip performance. Although the dip exercise includes an extension of the glenohumeral joint [27] and a strong activation of the pectoral muscle [28], arm extensor muscles may be more important than chest girth for the final performance. A relevant contribution \begin{table}
\begin{tabular}{l c c c} \hline \hline
**Performance** & **Prediction Equations** & **R\({}^{2}\)** & **RMSE** \\ \hline Corrected Chin-up & \(-\)110.375 + (3.088 \(\times\) tensed and flexed arm girth) + (1.383 \(\times\) chest girth) \(-\) & 0.89 & 11.14 \\  & \((1.226\times\) \%bodyfat) & 0.90 & 13.58 \\ Corrected Muscle-up & \(-\)79.593 + (1.059 \(\times\) chest girth) + (1.688 \(\times\) tensed and flexed arm girth) & 0.66 & 7.707 \\ Corrected Squat & \(-\)94.110 + (1.931 \(\times\) ICSA) + (15.420 \(\times\) sex) & 0.81 & 24.081 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Linear regression model for corrected streetlifting performance. Tensed and flexed arm and chest girth are expressed in cm. tCSA = thigh cross-sectional area; sex: 0 = women and 1 = men. RMSE = root-mean-square error. of the triceps muscle was also reported by the same research group [29]. As previously mentioned for chin-ups, a high body fat percentage showed a negative influence on dip performance. Squarks represent the exercise included in the streetlifting program that has more influence on the final total score in the competition (44% for men and 49% for women).