ECSS Paris 2023: OP-PN10
INTRODUCTION: A hypercaloric diet is commonly used during resistance training to promote muscle hypertrophy but often increases body weight (BW) and fat mass (FM), potentially causing adverse metabolic effects. Time-restricted eating (TRE), particularly 16:8 (TRE16:8), may mitigate these effects. Evidence on TRE16:8 under hypercaloric conditions in resistance-trained individuals is limited. This study investigated the effects of TRE16:8 on strength, body composition, glucose metabolism, and dietary intake during a hypertrophy phase. METHODS: In a 12-week randomized controlled trial, 23 healthy, resistance-trained adults (29.9±8.6 years; 17 men, 6 women) were assigned to either a TRE group (TRE16:8; n=11) or a control group (CG; n=12). Both groups followed a standardized resistance training program (3 sessions/week) and consumed a hypercaloric diet (+300–500 kcal/day). Every four weeks (T0–T3), one-repetition maximum (1RM) in the bench press (BP) and deadlift (DL), BW, fat-free mass (FFM), muscle mass (MM), and FM were assessed. Dietary intake was recorded using the FDDB app and analyzed with EBISpro. Blood parameters related to glucose metabolism (HbA1c, fasting glucose, insulin, and HOMA-IR) were measured pre- and post-intervention. Data were analyzed using linear mixed-effects models. RESULTS: Both groups significantly improved maximal strength in the BP (TRE16:8, 12.95±7.23kg; CG, 11.04±3.61kg; p<0.001) and DL (TRE16:8, 26.36±10.92kg; CG, 26.04±8.01kg; p<0.001) as well as FFM (TRE16:8, 1.34±0.78kg; CG, 1.38±1.42kg; p<0.001) and MM (TRE16:8, 1.07±0.94kg; CG, 1.13±0.61kg; p<0.001) with no significant differences between groups. BW (TRE16:8, 2.19±2.40kg; CG, 3.90±2.14kg) and FM (TRE16:8, 2.00±2.49kg; CG, 4.38±2.26kg) increased in both groups. However, these increases were significantly smaller in the TRE16:8 compared to the CG (BW: p=0.018; FM: p=0.009). Dietary records (n=18) showed TRE16:8 consumed fewer carbs (p=0.002), protein (p=0.038), and energy (p=0.003) than planned. Between-group comparisons showed significant differences in energy intake (p=0.015) and carbohydrate intake relative to FFM (p=0.027). Furthermore, significant time*group interactions were observed for markers of glycemic control. The TRE16:8 group exhibited reductions in HbA1c and fasting insulin, whereas these parameters increased in the control group (HbA1c: p=0.001; insulin: p=0.045), indicating improved glucose homeostasis. CONCLUSION: TRE16:8 resulted in comparable gains in 1RM strength, MM, and FFM compared with a conventional hypercaloric diet during a bulking phase, while attenuating increases in BW and FM. Additionally, TRE16:8 was associated with more favorable glycemic markers. Notably, the time-restricted eating window naturally limited energy intake despite a prescribed hypercaloric diet. These findings suggest that TRE16:8 is a pragmatic and effective nutritional strategy during a muscle-building phase, enabling sufficient anabolic adaptations while constraining excessive energy surplus and fat gain.
Read CV Joshua DissemondECSS Paris 2023: OP-PN10
INTRODUCTION: Time restricted eating (TRE) has been investigated as a dietary strategy adopted by individuals engaging in different sports. However, while evidence suggests that TRE can be compatible with resistance training (RT), the impact of training timing relative to the feeding window remains poorly understood. Identifying whether RT performed at different times of day modulates performance outcomes could have relevant implications for athletes. METHODS: Twentysix participants (8 F and 18 M) were recruited and divided into two groups based on training time: morning (n=11) and afternoon (n=15). Both groups followed a 16:8 TRE protocol. The morning group (age 28.3±8.8 years; body weight 75.3±12.7 kg) trained in a fasted state before noon, whereas the afternoon group (age 27.3±7.1 years; body weight 74.1±10.9 kg) trained during the eating window (12:00–20:00). Participants were tested before and after a 6-week intervention. We measured basal metabolic rate, body composition using DXA and blood analyses (TST, IGF-1, glucose, insulin, FT3, TSH, IL1, IL6, TNF, total cholesterol, HDL cholesterol, LDL cholesterol, and triglycerides). Maximal performance was evaluated through one repetition maximum (1RM) tests for leg press, leg extension, and bench press, as well as isokinetic and isometric tests using a Biodex dynamometer. To monitor their calorie intake, participants completed 3-days food diaries, and their exercise schedule was monitored weekly. RESULTS: A mixed-factor ANOVA revealed that TRE combined with RT led to significant time related improvements in 1RM leg press and 1RM leg extension (p = 0.003, p = 0.001), while 1RM bench press remained unchanged. Isometric and isokinetic dynamometer tests showed no significant changes. Regarding body composition, significant reductions were observed in body weight (p = 0.020) and fat mass percentage (p = 0.013), whereas lean mass remained unchanged. Blood analyses showed a significant decrease in FT3 levels (p = 0.030). A significant reduction in caloric intake from baseline to post-intervention was observed based on food diaries. No significant differences were found between the morning and afternoon groups. CONCLUSION: The combination of TRE and RT produces promising results for body recomposition, particularly through reductions in fat mass percentage while preserving lean mass. In resistance-trained individuals following a 16:8 TRE protocol, training time did not affect performance outcomes. No differences emerged between morning fasted and afternoon fed training. Thus, RT can be scheduled based on personal preference without compromising performance.
Read CV VALERIA STIRCUECSS Paris 2023: OP-PN10
INTRODUCTION: The nutritional components of one’s diet is known to be a crucial to health and optimal athletic performance (1). Unclear, however, is if the timing of nutritional intake impacts performance as well. Intermittent fasting (IF) is a popular diet that reduces risk factors for cardiometabolic disease (2). The effect of IF on athletic performance is debated, and little research exists on its effect on exercise rehabilitation (3). Moreover, the measured outcome for studies involving IF are almost exclusively disease scoring and body composition, with little to no consideration functional movement recovery (3). Therefore, this study wants to look at the effects of IF on exercise-based functional output in an animal model of cardiovascular disease. METHODS: The effect of time-restricted feeding (TRF) on functional movement recovery (specifically locomotion and fine motor control) was tested in aged (>15months) and young (2-6months) mice, and compared to age-matched animals who had access to food ad libitum (FAL). TRF was defined as sixteen hours without access and eight hours with access to food. The feeding period for the TRF cohort coincided with the active (awake) period of the mouse circadian rhythm. TRF was initiated two days after stroke was induced. Movement recovery was measured via the rotating pole test and the sticky tape removal test, and were conducted 2 days prior to stroke to obtain a baseline measurement, and at post-stroke days 2, 7, 14, 21, 37. Results were analysed for significance using mixed effects models taking into consideration feeding condition, age, and sex. RESULTS: TRF has no effect on behavioural outcome in both aged and young cohorts, in both pre- and post-stroke conditions. Unexpectedly however, we observed that TRF increased the mortality rate of aged male mice compared to aged female mice (34% survival at day 40 compared to 100% survival, p = 0.002), and compared to FAL aged male mice (80% survival at day 40, p = 0.041). CONCLUSION: IF, though commonly thought to be an eating pattern with cardiometabolic benefits, increases mortality in aged males. The lack of weight loss was expected, mimicking the most common form of IF in humans (IF with no caloric restriction). Meanwhile, caloric restriction with active rehabilitation does show reduced risk factors in diseased and athletic populations (3,4). Therefore, we show that in IF, it is not the time window of which one eats that yields health benefits in disease and movement rehabilitation, but rather simple caloric restriction. These findings can be used to further benefit rehabilitation programmes for the aging, diseased, and athletic populations to promote functional recovery with nutrition in mind. 1. Kozjek 2025, 2. Barve 2025, 3. Conde-Pipó 2024, 4. Fonta 2008
Read CV Stefanie MayerECSS Paris 2023: OP-PN10