健康青少年男、女最大脂肪氧化心率与有氧阈的相关性。
Correlation Between Heart Rate at Maximal Fat Oxidation and Aerobic Threshold in Healthy Adolescent Boys and Girls.
机构信息
Appalachian State University.
Cary Academy.
出版信息
Pediatr Exerc Sci. 2021 May 6;33(3):139-143. doi: 10.1123/pes.2020-0210.
PURPOSE
To investigate the association between the heart rate (HR) at maximal fat oxidation (MFO) and the HR at the aerobic threshold (AerT) in adolescent boys and girls, and to identify sex differences in the intensity that elicits MFO (Fatmax) as a percentage of HR peak (HRpeak).
METHODS
Fifty-eight healthy adolescents participated in this study (29 boys and 29 girls). Participants performed a cardiopulmonary exercise test on a cycle ergometer. MFO was calculated using a stoichiometric equation, and the AerT was identified using gas exchange parameters.
RESULTS
A strong correlation between HR at Fatmax and HR at AerT was found in both boys and girls (r = .96 and .94, respectively). Fatmax as a percentage of HRpeak occurred at 61.0% (4.9%) of HRpeak and 66.8% (6.9%) of HRpeak in adolescent boys and girls (P = .001, F = 13.6), respectively. MFO was higher in boys compared with girls (324 [150] and 240 [95] mg/min, respectively), and no sex differences were observed in the relative contribution of fat to energy expenditure at Fatmax.
CONCLUSIONS
HR at Fatmax and HR at AerT were highly correlated in adolescent boys and girls. Girls obtained Fatmax at a higher percentage of HRpeak than boys.
目的
探讨青少年男、女最大脂肪氧化率（MFO）时的心率（HR）与有氧阈（AerT）时的 HR 之间的相关性，并确定引发 MFO（Fatmax）的强度与 HR 峰值（HRpeak）的百分比在性别上的差异。
方法
本研究纳入了 58 名健康青少年（男 29 名，女 29 名）。参与者在功率自行车上进行心肺运动测试。使用化学计量方程式计算 MFO，通过气体交换参数确定 AerT。
结果
在男、女青少年中，Fatmax 时的 HR 与 AerT 时的 HR 之间均存在很强的相关性（r =.96 和.94）。Fatmax 占 HRpeak 的百分比在男、女青少年中分别为 61.0%（4.9%）和 66.8%（6.9%）（P =.001，F = 13.6）。与女孩相比，男孩的 MFO 更高（分别为 324 [150] 和 240 [95] mg/min），但在 Fatmax 时脂肪对能量消耗的相对贡献在性别上无差异。
结论
在青少年男、女中，Fatmax 时的 HR 与 AerT 时的 HR 高度相关。与男孩相比，女孩在更高的 HRpeak 百分比时达到 Fatmax。
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