The current study examined the effect of sprint interval exercise on postexercise oxygen consumption, respiratory-exchange ratio (RER), substrate oxidation, and blood pressure in adolescents. Participants were 10 normal-weight healthy youth (7 female), age 15–18 years. After overnight fasts, each participant undertook 2 trials in a random balanced order: (a) two 30-s bouts of sprint interval exercise on a cycle ergometer and (b) rested in the laboratory for an equivalent period. Timematched measurements of oxygen consumption, RER, and blood pressure were made 90 min into recovery, and substrate oxidation were calculated over the time period. Total postexercise oxygen uptake was significantly higher in the exercise than control trial over the 90 min (mean [SD]: control 20.0 [6.0] L, exercise 24.8 [9.8] L; p = .030). After exercise, RER was elevated above control but then fell rapidly and was lower than control 30–60 min postexercise, and fat oxidation was significantly higher in the exercise than control trial 45–60 min postexercise. However, total fat oxidation did not differ between trials (control 4.5 [2.5] g, exercise 5.4 [2.7] g; p = .247). Post hoc tests revealed that systolic blood pressure was significantly lower than in control at 90 min postexercise (control 104  mm Hg, exercise 99  mm Hg; p < .05). These data indicate that acute sprint interval exercise leads to short-term increases in oxygen uptake and reduced blood pressure in youth. The authors suggest that health outcomes in response to sprint interval training be examined in children.
Stephen F. Burns, Hnin Hnin Oo and Anh Thanh Thuy Tran
Denise M. Hill, Nic Matthews and Ruth Senior
This study used qualitative methods to explore the stressors, appraisal mechanism, emotional response, and effective/ineffective coping strategies experienced by elite rugby union referees during pressurized performances. Participants included seven male rugby union referees from the United Kingdom (Mage = 27.85, SD = 4.56) who had been officiating as full-time professionals for between 1 and 16 years (M = 4.85, SD = 5.42). Data revealed that the referees encountered a number of stressors, which were appraised initially as a ‘threat’, and elicited negatively-toned emotions. The referees were able to maintain performance standards under pressure by adopting proactive, problem- and emotion-focused coping strategies which managed effectively the stressors and their emotions. However, the use of avoidance-coping, reactive control, and informal impression management were perceived as ineffective coping strategies, and associated with poor performance and choking. Recommendations are offered to inform the psychological skills training of rugby union referees.
Borut Fonda and Nejc Sarabon
It has been reported in practice that the application of lower-body negative pressure (LBNP) to elite athletes during periods of intense training can help aid recovery.
To examine the effects of LBNP on biochemical, pain, and performance parameters during a 5-d recovery period after a damaging plyometric-exercise bout.
Randomized controlled study.
24 healthy young female adults were randomly allocated into 2 groups. Before and 1, 24, 48, and 96 h after the damaging exercise for hamstrings (50 drop jumps and 50 leg curls), participants underwent a series of tests (blood samples, pain sensation, countermovement jump, maximal isometric torque production, maximal explosive isometric torque production, and 10-m sprint). After the damaging exercise, the experimental group was exposed to intermittent LBNP therapy daily for 60 min.
There was a statistically significant interaction (P < .05) between the experimental and control groups for maximal strength, explosive strength, pain sensation, and vertical jumps (maximal power and force). No statistically significant interaction was present for the biochemical markers, jump height, and 100-m sprint.
LBNP therapy could improve recovery by limiting the loss in muscle strength and power and limiting the presence of pain.
Nadav Goldschmied, Max Nankin and Guy Cafri
Icing is a common strategy used in American football during the last moments of a close game when a coach may ask for a time-out to allow an opposing kicker, who is about to attempt a decisive field-kick, an extended period of time possibly to contemplate the negative outcomes if he fails to score (i.e., rumination). Using archival data of pressure kicks from six consecutive National Football League seasons (2002—2008), a mixed-effects hierarchical linear model was applied. It was found that icing was successful in reducing scoring while other environmental factors such as experience, game location or game score were not associated with conversion success. In a secondary analysis it was demonstrated that if a time-out before the pressure kick is requested by the coaches of the kicking team, kickers are not subjected to the debilitating effects of icing. Theoretical and applied implications are also discussed.
Samuel J.D. Cumming, Martin J. Turner and Marc Jones
Challenge cognitive appraisals are associated with superior performance compared with threat (Jones, Meijen, McCarthy, & Sheffield, 2009). However, research has not examined longitudinal temporal patterns of challenge and threat appraisals. In this study, 14 (five female) elite rowers (Mage = 25.79 years, SD = 2.67) provided self-reported appraisals data at four time points (baseline; before national trials; before the second world rowing cup regatta; and before the world rowing championships). The rowers’ predisposed appraisal style predicted subsequent appraisals. Challenge and self-efficacy increased while loss and avoidance appraisals decreased over time. The rowers were highly predisposed to challenge, becoming more challenged through events of increasing magnitude. This suggests that athletes’ predisposed appraisal style can predict their approach to competition. Future studies could identify protocols for encouraging challenge states in athletes, observe the physiological indicators of challenge and threat longitudinally, and consider the interaction between challenge and threat appraisals.
Austin T. Robinson, Adriana Mazzuco, Ahmad S. Sabbahi, Audrey Borghi-Silva and Shane A. Phillips
multi-ingredient preworkout supplements, 4 weeks of multi-ingredient preworkout supplementation does not affect resting blood pressure (BP), even in participants taking double the manufacturer’s recommended dosage ( Joy et al., 2015 ; Vogel et al., 2015 ). However, the effects of multi
Hermann Zbinden-Foncea, Isabel Rada, Jesus Gomez, Marco Kokaly, Trent Stellingwerff, Louise Deldicque and Luis Peñailillo
(visits 2 and 3), subjects arrived at the laboratory at 7:00 AM after an 8-hour fast to minimize all nutritional and diurnal effects. After they spent 5 minutes in resting supine position, heart rate (HR) (Polar® S625X, Polar Electro Oy, Kempele, Finland) and blood pressure were measured by a digital
Rory Warnock, Owen Jeffries, Stephen Patterson and Mark Waldron
(B[La]), and blood pressure (BP) (OMRON Healthcare Europe B.V., Hoofddrop, Netherlands). Blood pressure was measured by occluding the left brachial artery of participants and reported as the mean arterial pressure (MAP) (MAP = diastolic blood pressure + 0.33 [systolic blood pressure – diastolic blood
Daniel G. Hursh, Marissa N. Baranauskas, Chad C. Wiggins, Shane Bielko, Timothy D. Mickleborough and Robert F. Chapman
significantly increase maximum inspiratory pressure (MIP) and improve endurance performance outcomes. 15 , 23 – 25 The TIRE protocol requires the subject to forcefully exhale to residual volume, immediately followed by a sustained maximal inhalation to total lung capacity against resistance provided by a 2-mm