This study aimed to estimate parameters of the model in which perseverance of effort and consistency of interest of grit scale are related directly to objectively measured physical activity (PA) and indirectly via PA intention in school students (N = 209) aged 12 to 14 years. The Grit Scale was used to estimate the consistency of interests and perseverance of efforts. The measure for intention consisted of two items from the Theory of Planned Behaviour Questionnaire. Actigraph was used to measure moderate-to-vigorous physical activity (MVPA) during seven consecutive days. A well-fitting structural equation model (χ2 = 46.169, df = 31; CFI = .958; RMSEA = .053) demonstrated the significant direct effect (β = .286, p< .001) from perseverance of efforts on intention to be physical active. Physical activity intention mediated the effect of the perseverance of efforts on moderate-to-vigorous physical activity (MVPA), but not the effect of consistency of interest. The total effect from the consistency of interest on MVPA was significant, but the perseverance of efforts was not. The dimension of the perseverance of efforts between groups with high and low MVPA was not statistically significantly different, whereas the intention was significantly higher in the high-MVPA group. The consistency of the interest dimension in the high MVPA group was significantly higher than in low group only at p < .1 level. The findings of the study may be used by physical education teachers for the promotion of physical activity, highlighting the role of consistency of interest on MVPA.

中文翻译：

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沙粒与学生中度测量的中度到剧烈运动量的关系

这项研究旨在评估模型的参数，其中毅力的毅力和兴趣量表的一致性与客观测量的体育活动（PA）直接相关，而与12至14岁在校学生（N = 209）的PA意图间接相关。粒度表用来估计利益的一致性和努力的毅力。意图量度包括“计划行为问卷理论”中的两个项目。使用Actigraph连续7天测量中度至剧烈的体育活动（MVPA）。一个非常合适的结构方程模型（χ2= 46.169，df = 31; CFI = .958; RMSEA = .053）表明，坚持不懈地努力意向明显地产生了直接的影响（β= .286，p <.001）身体活跃。身体活动的意图介导了坚持不懈的努力对中度至剧烈的身体活动（MVPA）的影响，但没有介导兴趣一致性的影响。兴趣一致性对MVPA的总影响是显着的，但坚持不懈却没有。高和低MVPA组之间的坚持不懈的维度在统计学上没有显着差异，而在高MVPA组中，意向显着更高。仅在p <.1水平下，高MVPA组的兴趣维度一致性显着高于低MVPA组。该研究的结果可能被体育教师用于促进体育锻炼，突出了兴趣一致性对MVPA的作用。