Effects of 1,144 km of road cycling performed in 7 days: a cardiometabolic imaging study.

IF 4.2 2区 医学 Q1 ENDOCRINOLOGY & METABOLISM American journal of physiology. Endocrinology and metabolism Pub Date : 2024-09-01 Epub Date: 2024-07-24 DOI:10.1152/ajpendo.00098.2024
Dominic J Chartrand, Adrien Murphy-Després, Isabelle Lemieux, Eric Larose, Paul Poirier, Jean-Pierre Després, Natalie Alméras
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Abstract

This cardiometabolic imaging study was designed to document the adaptation of middle-aged recreational cyclists to a large exercise prescription not aiming at weight loss. Eleven middle-aged recreational male cyclists traveled 1,144 km over seven consecutive days. A comprehensive cardiometabolic profile including visceral and ectopic adiposity assessed by magnetic resonance imaging was obtained at baseline and following the exercise week. Cardiorespiratory fitness (CRF) was measured using maximal cardiopulmonary exercise testing. During the week, heart rate was monitored to calculate individual energy expenditure. Baseline characteristics of cyclists were compared with 86 healthy males in the same age range. Cyclists presented higher baseline CRF (+9.2 mL/kg/min, P < 0.0001) and lower subcutaneous (-56.2 mL, P < 0.05) and liver (-3.3%, P < 0.05) fat compared with the reference group. Despite the large energy expenditure during the cycling week, the increase in energy intake limited decreases in body weight (-0.8 ± 0.9 kg, P < 0.05) and body mass index (-0.3 ± 0.3 kg/m2, P < 0.05). Loss of fat mass (-1.5 ± 1.0 kg, P < 0.001) and a trend toward an increased lean mass (+0.8 ± 1.2 kg, P < 0.07) were observed. Visceral adiposity (-14.1 ± 14.2 mL, P < 0.01) and waist circumference (-3.2 ± 1.7 cm, P < 0.0001) decreased, whereas subcutaneous (-2.7 ± 5.1 mL, NS), liver (-0.5 ± 0.9%, NS), and cardiac (-0.3 ± 2.3 mL, NS) fat remained unchanged. This cardiometabolic imaging study documents middle-aged recreational cyclists' subcutaneous and visceral adiposity as well as cardiac and liver fat responses to a large volume of endurance exercise despite an increase in energy intake aimed at limiting weight loss.NEW & NOTEWORTHY Even when being accompanied by a substantial increase in energy intake to compensate energy expenditure and limit weight loss, a large volume of endurance exercise performed within a short period of time is associated with a significant reduction in visceral adiposity. High cardiorespiratory fitness is associated with low levels of liver fat in middle-aged males.

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7 天内骑行 1 144 公里公路自行车的影响:心脏代谢成像研究。
这项心脏代谢成像研究旨在记录中年休闲自行车运动员对不以减肥为目的的大型运动处方的适应情况。十一名中年休闲男性自行车运动员连续七天骑行了 1144 公里。在基线和运动周结束后进行了全面的心脏代谢分析,包括通过磁共振成像评估内脏脂肪和异位脂肪。心肺功能(CRF)通过最大心肺运动测试进行测量。在运动周期间,对心率进行监测,以计算个人能量消耗。将自行车运动员的基线特征与年龄相同的 86 名健康男性进行了比较。自行车运动员的基线CRF(+9.2 mL/kg/min,ppp2,ppp
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来源期刊
CiteScore
9.80
自引率
0.00%
发文量
98
审稿时长
1 months
期刊介绍: The American Journal of Physiology-Endocrinology and Metabolism publishes original, mechanistic studies on the physiology of endocrine and metabolic systems. Physiological, cellular, and molecular studies in whole animals or humans will be considered. Specific themes include, but are not limited to, mechanisms of hormone and growth factor action; hormonal and nutritional regulation of metabolism, inflammation, microbiome and energy balance; integrative organ cross talk; paracrine and autocrine control of endocrine cells; function and activation of hormone receptors; endocrine or metabolic control of channels, transporters, and membrane function; temporal analysis of hormone secretion and metabolism; and mathematical/kinetic modeling of metabolism. Novel molecular, immunological, or biophysical studies of hormone action are also welcome.
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