The effect of diurnal variation on the performance of exhaustive continuous and alternated-intensity cycling exercises
Autor: | Amine Souissi, Tarak Driss, Monoem Haddad, Nizar Souissi, Narimen Yousfi |
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Rok vydání: | 2020 |
Předmět: |
Male
Physiology Social Sciences High-Intensity Interval Training 0302 clinical medicine Time of day Heart Rate Medicine and Health Sciences Human Performance Medicine Psychology Public and Occupational Health Morning Multidisciplinary Sports Science Circadian Rhythm Body Fluids Circadian Rhythms Chemistry Blood Physical Sciences Anatomy Cycling Research Article Chemical Elements Adult Science Physical activity Cardiology 03 medical and health sciences Animal science Heart rate Humans Lactic Acid Sports and Exercise Medicine Exercise Behavior business.industry Diurnal temperature variation Biology and Life Sciences 030229 sport sciences Physical Activity Intensity (physics) Oxygen Physical Fitness Physical Endurance Late afternoon Diurnal Variations business Chronobiology 030217 neurology & neurosurgery |
Zdroj: | PLoS ONE PLoS ONE, Vol 15, Iss 12, p e0244191 (2020) |
ISSN: | 1932-6203 |
Popis: | The purpose of this study was to explore the effect of time of day (TD) on two types of exercise protocols [continuous (CP) versus alternated (AP)]. Eleven physical education students (mean ± SD: age = 24.4 ± 1.2 years, aerobic peak power (APP) = 290 ± 31.9 W) underwent four sessions. These sessions were performed at 08:00 (AM) and 18:00 (PM) and consisted of cycling exercises until voluntary exhaustion at 90% APP (CP) or 70%-105% APP (AP) with the order of testing randomly assigned. Time to exhaustion (time limit = Tlim) was measured from the start of the test to when voluntary exhaustion occurred. Heart rate (HR) was recorded at baseline (HRbaseline) and throughout the protocols to determine HR at exhaustion (HRpeak). Blood lactate ([La]) was measured at rest, immediately after exhaustion and at 2min30 post-exercise to determine [La]peak. A significantly higher means of Tlim (334 ± 57 s; 272 ± 59 s; p< 0.05), HRbaseline (72 ± 5 beats/min; 67 ± 5 beats/min; p< 0.01), HRpeak (186 ± 8 beats/min; 178 ± 9 beats/min; p< 0.01) and [La]peak (16.2 ± 2.1 mmol/l; 13.9 ± 1.9 mmol/l; p< 0.05) were observed in CP at the PM compared to the AM. In addition, a significant higher means of Tlim (380 ± 54 s; 312 ± 82 s; p< 0.05), HRbaseline (73.1 ± 5.5 beats/min; 67 ± 5.4 beats/min; p< 0.01), HRpeak (186 ± 8 beats/min; 180 ± 9 beats/min; p< 0.05) and [La]peak (17.9 ± 1.8 mmol/l; 14.7 ± 2.1 mmol/l; p< 0.01) were observed in AP at the PM compared to the AM. It is concluded that AP and CP are more appropriate in the late afternoon than in the morning for performing long-lasting exercises. The AP could be a novel strategy for increasing the engagement in physical activity. |
Databáze: | OpenAIRE |
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