Acute and delayed responses of steroidal hormones, blood lactate and biomarkers of muscle damage after a resistance training session: time-of-day effects

Ammar, Achraf; Chtourou, Hamdi; Turki, Mouna; Hammouda, Omar; Chaari, Ahmed; Boudaya, M.; Driss, Tarak; Ayedi, Fatma; Souissi, Nizar

doi:10.23736/s0022-4707.17.07048-7

Cited by 21 publications

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“…The present findings are in accordance with other studies showing a higher [La] and V̇O 2 in the evening compared to the morning during a 1000 m cycling time trial [ 19 ], endurance exercise above the ventilatory threshold [ 38 , 42 ] or during the YoYo intermittent recovery test [ 7 , 11 ]. However, the present results are in contrast with several previous studies that failed to provide evidence for significant diurnal variation of V̇O 2 and/or [La] during submaximal [ 12 , 18 , 40 ], maximal [ 7 , 21 , 32 , 41 ] or self-paced [ 9 , 19 , 35 ] exercises. These results could be explained by an achieved V̇O 2max , [La] and RPE at different TOD by different athletes [ 21 ].…”

Section: Discussioncontrasting

confidence: 99%

“…This finding may indicate that morning-evening increase in IAT (and consequently core temperature) could explain in part the decreased completion time and thereby the better physical performance recorded in the evening. In line with this speculation and given the similar magnitude of the TOD effect on IAT and physical performance, changes in core temperature have been frequently used to explain the enhanced performance in the late afternoon and evening [ 3 , 4 , 5 , 21 , 35 ]. Indeed, it has been previously suggested that the increase in core temperature during the day can serve as a passive muscle warm-up improving the efficiency of the neuromuscular system through (i) increasing nerve conduction velocity, body chemical reaction, muscle vascularization and range of motion and (ii) decreasing muscle viscosity [ 14 , 36 , 37 , 38 , 39 ].…”

Section: Discussionmentioning

confidence: 99%

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Higher evening metabolic responses contribute to diurnal variation of self-paced cycling performance

Souissi¹,

Ammar²,

Ayachi³

et al. 2022

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This study examined the effect of time of day (TOD) on physical performance, and physiological and perceptual responses to a 10-km cycling time trial (TT 10km ). Twelve physically trained subjects (20.3 ± 1.2 years, 74.3 ± 7.4 kg, 179.7 ± 5.5 cm) completed, in a randomized order, a TT 10km in the morning and in the evening. Intra-aural temperature (IAT) was measured at rest and following the TT 10km . Completion time, power output (PO), rating of perceived exertion (RPE), heart rate (HR), minute ventilation (V̇E), oxygen uptake (V̇O 2 ), carbon dioxide production (V̇CO 2 ) and respiratory exchange ratio (RER) were assessed every km during the TT 10km . Blood lactate concentration [La] and blood glucose concentration [Glu] were assessed before, during and immediately after the TT 10km . Faster completion time (Δ = 15.0s, p = 0.03) and higher IAT (Δ = 0.33°C, p = 0.02 for pre-TT 10km ) were obtained in the evening compared to the morning with a significant correlation between Δ completion time and Δ IAT at post-TT 10 km (r = -0.83, p = 0.04). V̇O 2 , [La] and [Glu] increased significantly during both test sessions (p < 0.001) with higher values in the evening compared to the morning (p = 0.015, p = 0.04, p = 0.01, respectively). However, the remaining parameters were found to be only affected by the TT 10km (p < 0.001). The TT 10km generates a higher V̇O 2 and higher [La] and [Glu] responses, contributing to a better cycling performance in the evening compared to the morning. The similar magnitude of the TOD effect on completion time and IAT at post-TT 10km confirms that core temperature is one of the underlying factors contributing to the diurnal variation in physical performance.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Higher evening metabolic responses contribute to diurnal variation of self-paced cycling performance

Souissi¹,

Ammar²,

Ayachi³

et al. 2022

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“…To avoid the time-of-day effect (TOD) [ 38 , 39 ], all blood samples were obtained between 07h00 and 08h00. Insulin, and glucose, were determined in the basal state after 12 h of fasting.…”

Section: Methodsmentioning

confidence: 99%

The Impact of Exercise Training Intensity on Physiological Adaptations and Insulin Resistance in Women with Abdominal Obesity

et al. 2022

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Abdominal obesity has emerged globally as a major public health issue due to its high prevalence and morbidity. The benefits of physical exercise among the obese population are well documented. However, the optimal exercise intensity for reducing body fat and preventing insulin resistance and metabolic disorders is still under debate. This study aimed to examine the effects of three different intensities of combined endurance and strength training programs on anthropometric variables, physiological and muscular adaptations, and insulin sensitivity. Forty-three obese young women (age 26.4 ± 4.7 years, BMI 33.1 ± 2.5 kg/m2) were randomly assigned to one of four groups: a control group (G0), a moderate-intensity training group (G50, exercising brisk walking at 50% heart rate reserve HRR), a high-intensity training group (G75, exercise jogging at 75% HRR), and an alternated-intensity training group (G50/75, exercise brisk-walking/jogging at 50–75% HRR) with additional strength training once a week for each group. Body composition, waist circumference (WC), fasting blood glucose, insulin sensitivity and resistance (Homa-IR), resting heart rate (RHR), 6-min walk distance (6MWD), 1-repetition maximum (1-RM), and time to exhaustion (TTE) at 45% and 75% maximal voluntary contraction (MVC) for both the flexor and extensor muscle groups of the knees, were recorded before and after three months of exercise training. All training groups showed significant decreases in body mass, BMI, total body fat, body fat percentage, WC, abdominal and visceral mass (p < 0.001), with a greater reduction of body mass and BMI in G75 (p < 0.05). Lean mass increased significantly only in G50/75 (p < 0.05). The insulin sensitivity and Homa-IR decreased in the three training groups (p < 0.01), with greater enhanced resistance in G50 compared to G75 and G50/75 (p < 0.05). In contrast, there were no pre-post changes in all groups for fasting blood glucose (p > 0.05). 1-RM and TTE of the knee flexor and extensor muscles were improved in the three groups (p < 0.01), with greater improvement in G50/75 for 1RM and G75 in most of the TTE parameters (p < 0.05). RHR decreased and 6MWD increased significantly in the three training groups (p < 0.01), with greater 6MWD improvement in G75 (p < 0.05). In conclusion, the three training intensities seem to generate benefits in terms of body composition, physiological and muscular adaptations, and insulin resistance. High training intensity resulted in greater improvements in body mass, BMI, and endurance and strength, whereas moderate training intensity resulted in greater improvements of insulin resistance and homo-IR. Following alternate-intensity training, greater improvements were observed in lean mass and maximal strength performance.

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“…Finally, high-intensity maximal tasks induced several changes in hematological data (Wardyn et al, 2008). The latter are dependent on the type, intensity and duration of exercise (Ammar et al, 2017(Ammar et al, , 2018Belviranli et al, 2017).…”

Section: Original Articlementioning

confidence: 98%

“…Testosterone and cortisol concentrations were significantly increased in high school students after a session of high-intensity exercise (70-85% of maximal heart rate) (Budde et al, 2015;Budde et al, 2010). Following high-intensity maximal tasks, many biochemical data increased, including creatine phosphokinase (CPK), blood lactate and glucose, and uric-acid (Ammar, Chtourou, Hammouda, et al, 2015;Ammar et al, 2018;Sousa et al, 2019;Yalcin et al, 2003). CPK is a well-known biomarker of muscle damage and may contribute to the fatigue process by increasing the myoplasmic concentration of inorganic phosphate (Khaitin et al, 2021).…”

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confidence: 99%

Biological Responses to Short-Term Maximal Exercise in Male Police Officers

Dergaa¹,

Saad

Romdhani³

et al. 2021

Am J Mens Health

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The specifics of short-term physical exercise are similar to the immediate reaction demands placed on police officers. Identifying the physiological predisposition to short-term high-intensity exercise in male law enforcement officers will assist in understanding their metabolism and make a significant contribution to a much more personal and individualized workout program. This will improve physical fitness of individual officers, improving their preparedness for such times of emergency. This cross-sectional study was conducted to investigate the responses of hematological (erythrocytes, hemoglobin, hematocrit, leucocytes, monocytes, neutrophils, lymphocytes), hormonal (testosterone, cortisol, melatonin), biochemical (glucose, uric-acid, lactate, creatine-phosphokinase) data to short-term maximal exercise in male police officers ( n = 20). Blood samples were collected before- and after- the running-based anaerobic sprint test (RAST), and biological values were corrected for fluid shifts. Data were mean ± standard deviation of differences (= after minus before RAST). After the RAST, values of cortisol, lactate, neutrophils, lymphocytes, and monocytes increased significantly by 7.01 ± 37.36 mmol/l, 7.55 ± 1.67 mmol/l, 0.17 ± 0.26 103/µl, 0.61 ± 0.28 103/µl, and 0.10 ± 0.13 103/µl, respectively. After the RAST, values of melatonin, uric-acid, creatine-phosphokinase, hemoglobin, and hematocrit decreased significantly by −13.24 ± 4.60 pg/ml, −13.28 ± 14.35 µmol/l, −10.23 ± 10.13 IU/l, −2.01 ± 0.81 g/dl, and −4.46 ± 0.59%, respectively. Biological data of male police officers were affected by sprint test. Understanding changes in biological data following short-term maximal exercise can further assist in a better understanding of anaerobic metabolism, which will be helpful to find available methods for coaches to quantify training loads.

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Acute and delayed responses of steroidal hormones, blood lactate and biomarkers of muscle damage after a resistance training session: time-of-day effects

Cited by 21 publications

References 0 publications

Higher evening metabolic responses contribute to diurnal variation of self-paced cycling performance

Higher evening metabolic responses contribute to diurnal variation of self-paced cycling performance

The Impact of Exercise Training Intensity on Physiological Adaptations and Insulin Resistance in Women with Abdominal Obesity

Biological Responses to Short-Term Maximal Exercise in Male Police Officers

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