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
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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