ORCID Profile
0000-0002-5135-0348
Current Organisations
Aichi Institute of Technology
,
Charles Sturt University
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Publisher: Canadian Science Publishing
Date: 05-2019
Abstract: The aim of this study was to compare the effect of high-intensity interval exercise (HIIE) and moderate-intensity continuous exercise (MICE) on sleep characteristics, appetite-related hormones, and eating behaviour. Eleven overweight, inactive men completed 2 consecutive nights of sleep assessments to determine baseline (BASE) sleep stages and arousals recorded by polysomnography (PSG). On separate afternoons (1400–1600 h), participants completed a 30-min exercise bout: either (i) MICE (60% peak oxygen consumption) or (ii) HIIE (60 s of work at 100% peak oxygen consumption: 240 s of rest at 50% peak oxygen consumption), in a randomised order. Measures included appetite-related hormones (acylated ghrelin, leptin, and peptide tyrosine tyrosine) and glucose before exercise, 30 min after exercise, and the next morning after exercise PSG sleep stages and actigraphy (sleep quantity and quality) in addition, self-reported sleep and food diaries were recorded until 48 h after exercise. There were no between-trial differences for time in bed (p = 0.19) or total sleep time (p = 0.99). After HIIE, stage N3 sleep was greater (21% ± 7%) compared with BASE (18% ± 7% p = 0.02). In addition, the number of arousals during rapid eye movement sleep were lower after HIIE (7 ± 5) compared with BASE (11 ± 7 p = 0.05). Wake after sleep onset was lower following MICE (41 min) compared with BASE (56 min p = 0.02). Acylated ghrelin was lower and glucose was higher at 30 min after HIIE when compared with MICE (p ≤ 0.05). There were no significant differences between conditions in terms of total energy intake (p ≥ 0.05). HIIE appears to be more beneficial than MICE for improving sleep quality and inducing favourable transient changes in appetite-related hormones in overweight, inactive men. However, energy intake was not altered regardless of exercise intensity.
Publisher: Wiley
Date: 03-04-2023
DOI: 10.1111/JSR.13857
Abstract: The study aim was to determine the effect of sleep restriction (3 h) between consecutive days of exercise on sprint and endurance cycling performance, wellness, and mood. A total of 10 well‐trained males performed 2 consecutive‐day trials separated by a normal night sleep (control [CONT] mean [SD] sleep duration 3.0 [0.2] h) or sleep restriction (RES mean [SD] sleep duration 3.0 [0.2] h). Experimental trials included a 90‐min fixed‐paced cycling bout and the respective sleep conditions on Day 1, followed by two 6‐s peak power (6‐s PP) tests, a 4‐ and 20‐min time trial (TT) on Day 2. Profile of Mood States (POMS) and wellness questionnaires were recorded on Day 1 and Day 2. Blood lactate and glucose, heart rate (HR), and rating of perceived exertion were recorded throughout Day 2. Power output (PO) was significantly reduced for RES in the 6‐s PP trial (mean [SD] 1159 [127] W for RES versus 1250 [186] W for CONT p = 0.04) and mean PO during the 20‐min TT (mean [SD] 237 [59] W for RES versus 255 [58] W for CONT p = 0.03). There were no differences for HR, lactate and glucose, or POMS between CONT and RES in all experimental trials ( p = 0.05–0.89). Participants reported a reduction in overall wellness prior to exercise on Day 2 following RES (mean [SD] 14.5 [1.6] au) compared to CONT (mean [SD] 16 [3.0] au p = 0.034). Sleep restriction and the associated reductions in wellness, reduce cycling performance during consecutive days of exercise in a range of cycling tests that are relevant to both track and road cyclists.
Publisher: Wiley
Date: 02-07-2022
Publisher: Wiley
Date: 27-10-2020
DOI: 10.1111/JSR.13215
Abstract: This preliminary study aimed to investigate the effect of exercise on appetite and mood following multiple days of sleep disruption (restriction [RES], fragmentation [FRAG]) or sleep extension (EXT), compared to normal sleep (CONT) in inactive, middle‐aged men. Nine men completed four randomised trials initiated by 3 nights (day 1–3) of CONT (6.5–8 hr), RES (4 hr), FRAG (6.5–8 hr, interrupted at 2‐hr intervals) or EXT (10 hr). On day 4 between 08:30 and 11:00 hours, perceived appetite, food cravings, appetite‐related hormones (acylated ghrelin, leptin, peptide tyrosine–tyrosine [PYY] total ), glucose, mood states and wellness (stress, fatigue, soreness, and mood) were assessed before (post‐sleep manipulation [SM]) and after (post‐exercise [EX]) a 20‐min vigorous cycling bout (rating of perceived exertion: 15). There was no effect of sleep manipulation or exercise on perceived appetite ( p = .34–.62). Some aspects of food craving were altered after RES and EXT, with vigorous exercise attenuating the desire for sweet foods in RES ( p = .12). PYY total was lower after RES compared to EXT and FRAG ( p = .03), but was unaltered by exercise ( p = .03). Ghrelin was higher for RES and EXT compared to CONT and FRAG after exercise ( p = .001–.03). Total wellness was reduced and total mood disturbance (TMD) was higher after RES and FRAG compared to CONT and EXT ( p ≤ .05). However, vigorous exercise countered these changes, with wellness and TMD remaining significantly impaired for FRAG compared to EXT only at this time ( p = .02–.03). Vigorous exercise mitigates some aspects of food cravings and counters the impaired mood states that exist after multiple days of restricted and fragmented sleep.
Publisher: Human Kinetics
Date: 10-2017
Abstract: Aerobic exercise (AE) and strength exercise ( SE ) are reported to induce discrete and specific appetite-related responses however, the effect of combining AE and SE (i.e., combined exercise CE) remains relatively unknown. Twelve inactive overweight men (age: 48 ± 5 y BMI: 29.9 ± 1.9 kg∙m 2 ) completed four conditions in a random order: 1) nonexercise control (CON) (50 min seated rest) 2) AE (50 min cycling 75% VO 2peak ) 3) SE (10 × 8 leg extensions 75% 1RM) and 4) CE (50% SE + 50% AE). Perceived appetite, and appetiterelated peptides and metabolites were assessed before and up to 2 h postcondition (0P, 30P, 60P, 90P, 120P). Perceived appetite did not differ between trials ( p .05). Acylated ghrelin was lower at 0P in AE compared with CON ( p = .039), while pancreatic polypeptide (PP) was elevated following AE compared with CON and CE. Glucose-dependent insulinotropic peptide (GIP total ) was greater following all exercise conditions compared with CON, as was glucagon, although concentrations were generally highest in AE ( p .05). Glucose was acutely increased with SE and AE ( p .05), while insulin and C-peptide were higher after SE compared with all other conditions ( p .05). In inactive, middle-aged men AE, SE and CE each have their own distinct effects on circulating appetite-related peptides and metabolites. Despite these differential exercise-induced hormone responses, exercise mode appears to have little effect on perceived appetite compared with a resting control in this population.
Publisher: Springer Science and Business Media LLC
Date: 13-04-2017
DOI: 10.1007/S00421-017-3613-1
Abstract: This study examined the effects of high-intensity interval training (HIIT 30 s sprint, 4-5 min passive recovery) and prolonged intermittent sprint training (PIST 10 s sprint, 2-3 min moderate exercise) on the systemic inflammatory markers C-reactive protein (CRP) and tumor necrosis factor-α (TNF-α), aerobic capacity, and anthropometry in a middle-aged, sedentary population. Fifty-five sedentary adults (age 49.2 ± 6.1 years) were randomised into HIIT (n = 20), PIST (n = 21), or a sedentary control group (CTRL n = 14). HIIT and PIST performed three training sessions per week for 9 weeks on a cycle ergometer, matched for total high-intensity time, while CTRL continued normal sedentary behaviours. Pre- and post-intervention testing involved measures of anthropometry, peak oxygen consumption (VO HIIT and PIST increased VO In sedentary in iduals, 9 weeks of HIIT or PIST were effective to improve aerobic capacity however, only HIIT significantly reduced waist girth and WHR compared to CTRL. Markers of systemic inflammation remained unchanged across all groups. Accordingly, for inflammation and VO2
Publisher: Wiley
Date: 29-03-2019
DOI: 10.1113/EP087455
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