International journal of exercise science最新文献

People living with and beyond breast cancer (LWBBC) experience different side effects relative to the type of medical treatments they received which may influence their needs for additional supportive care. Investigating people LWBBC's needs according to treatment regimen may guide decision making about supportive care priorities. The study's objectives were to identify individuals LWBBC's needs for supportive care and to determine exercise program participation facilitators according to treatment type. A survey assessing the needs for supportive care and exercise facilitators was distributed on the Facebook pages of five non-profit Canadian cancer organizations for three months. Needs and facilitators were assessed according to the combination of treatment type received including chemotherapy, radiotherapy or a combination of both. A convenience sample of 214 women LWBBC (mean age 50 ± 11 years) responded to the survey. Most (84%) participants reported searching for supportive care, especially exercise or psychological support for pain/fatigue management and improvement of psychological well-being. Higer proportions of women receiving chemotherapy (86-95%) were searching for supportive care compared to women not receiving chemotherapy (70%). Psychological support was the most searched supportive care among women receiving both chemotherapy and radiotherapy, while exercise program was most sought out by women receiving only one of these two treatment types. Low cost (47%) and accessibility to a supervised program (46%) were the most important exercise program facilitators for participants during treatment. Needs of women LWBBC seemed to diverge according to received treatment and should be considered when tailoring supportive care for these individuals.

The purpose of this study was to compare eccentric strengthening to static stretching for increasing hamstring flexibility. Sixty-three asymptomatic participants were recruited via convenience sampling. Nineteen participants did not meet the inclusion criteria, thus leaving 44 participants. Inclusion criteria included hamstring tightness defined using the passive knee extension test (PKE). Exclusion criteria included a history of any lower extremity injury, including hamstring injury, within the past 12 months. Participants were randomized into one of three groups: Nordic Hamstring Exercise (NHE) eccentric group, static hamstring stretching, or control group. Hamstring flexibility was assessed, via the PKE, at baseline, 3 weeks, and six weeks. Between and within group differences in hamstring flexibility were assessed using a mixed model ANOVA. The analysis yielded a significant time × group interaction ( < 0.05). At six weeks, both the static stretching and eccentric group had greater improvements in flexibility compared the control group (p < 0.001). This study adds to the body of research by demonstrating the positive effect of eccentric training on gross muscle length. It revealed the NHE results in similar increases in hamstring flexibility when compared to static hamstring stretching. As a result, either stretching or eccentric training can be used effectively to address hamstring flexibility deficits.

The isometric mid-thigh pull (IMTP) test using the traditional bar grip (BAR) is a reliable and effective measure of strength performance in different populations. In addition, IMTP performance has been linked to jump performance. Recent research has shown that the pelvic belt (PEL) IMTP method produces higher absolute and relative peak force values than the Bar IMTP method. However, limited scientific data has examined the PEL IMTP method performance data and its relationship to dynamic strength and sports performance. The study aimed to provide a more robust comparison between the BAR and PEL IMTP methods and examine the relationship between these methods and several countermovement jump (CMJ) performance variables. Thirty healthy National Collegiate Athletic Association (NCAA) Division III athletes volunteered for this study. Each participant was asked to attend and complete four separate lab sessions utilizing a bilateral force platform. The results of this study demonstrated that peak force and relative peak force were significantly (p ≤ .05) greater during the PEL IMTP method than during the BAR IMTP method. Further, force development increased similarly in both the BAR and PEL IMTP methods, although there were no differences between the methods (p>.05). Lastly, Pearson's product-moment correlations demonstrated a medium and significant (p ≤ .05) relationship between CMJ and PEL IMTP variables. In conclusion, the PEL IMTP can measure lower body force performance capabilities. Further, PEL IMTP variables can be used to predict jump performance and, therefore, may be used for assessment and training purposes.

Carbohydrate mouth rinse (CMR) is suggested to improve aerobic, anaerobic, and skill-related performance. The current study examined the influence of CMR on soccer-specific skills in 13 faster collegiate female soccer players. Athletes completed a control (CON) and two counterbalanced, double-blind experimental sessions. Sessions consisted of a warm-up, high-intensity soccer practice, followed by four soccer-specific skill tests. During the experimental sessions participants rinsed with a color-and-taste-matched CMR or placebo (PLA) solution before the skill tests. Thirst sensation (TS), rating of perceived exertion (RPE) and heart rate (HR) were assessed throughout sessions. Performance scores and HR values between sessions were compared with a one-way repeated measurements ANOVA. A Friedman test was used to compare RPE and TS. Post-hoc analyses were implemented when necessary. Agility times were significantly faster (p = .01) during CON session (10.9 ± 0.4 s) compared to PLA session (11.2 ± 0.4 s). There was no significant difference in scores for the other tests (p > .05). Post-practice RPE was lower (p = .01) for CMR session than CON session. TS was lower during PLA and CMR sessions compared to CON session following the warm-up (PLA p = .004; CMR p = .003) and practice (PLA p = .002; CMR p = .001). Average (p = .094) and maximal HR (p = .334) were similar across sessions. While CMR did not hinder soccer skill-related performance, the current study determined the use of CMR may not enhance soccer skill-related performance in fasted collegiate female soccer players.

No study has determined the impact a sprinting potentiating stimulus has on discus throwing performance in collegiate throwers. To test the hypothesis, that compared to a dynamic warm-up alone (DyWU), a dynamic warm-up with a multi-set sprinting potentiating stimulus (DyWU+SPR) would enhance discus throw performance. 12 NCAA Division I thrower athletes (18-25 year) randomly completed two sessions separated by at least 48 hours. One session involved a standardized dynamic warm-up (DyWU) and the other session involved a DyWU with multiple sets of a sprinting post-activation performance enhancement (PAPE) stimulus (DyWU+SPR), with both sessions followed by three trials of competition discus throws. A two-way ANOVA (warm-up x timepoint) with repeated measures was used for analyses, p < 0.05. There were no significant (p>0.05) differences between DyWU alone versus DyWU+SPR stimulus for discus throw distances at 8 min. (35.7±5.4 vs 35.0±5.5 meters, respectively; d = -0.12, trivial), 11 min. (34.8±4.5 vs 35.6±5.0 meters, respectively; d = 0.18, trivial), 14 min. (37.5±4.5 vs 36.7±4.9 meters, respectively; d = -0.19, trivial), or best throw attempt (36.2±5.1 vs 36.6±5.0 meters, respectively; d = 0.07, trivial). Within the parameters of this study, there were no differences in discus throw performance with DyWU+SPR compared to a DyWU alone in NCAA Division I throwers. Coaches, athletes, and practitioners should be aware that these results do not support the use of multiple sets of a sprinting PAPE stimulus beyond a dynamic warm-up alone to enhance discus throw performance in collegiate throwers.

Lower body positive pressure treadmills (LBPPT) have gained increasing attention due to their potential applications in sports training, rehabilitation, and biomechanics research. However, there is limited understanding of how differing body weight percentages influence gait and force production. This study aimed to investigate the relationship between force and gait parameters at different body weight percentages on a LBPPT. Twenty-seven healthy participants completed a series of walking, jogging, and running trials at three different body weight conditions: 100%, 90%, and 75%. Gait parameters, including cadence, stride length, stance time, and ground reaction force, were measured using the Digitsole Pro foot insoles and analyzed across the different conditions. Repeated measures ANOVA and pairwise comparisons were used to examine the effects of body weight percentage on the gait parameters. The results showed significant effects of BW on cadence, stride length, stance time, and impact force during running condition (p < 0.001). Jogging condition was significantly different across all % BW for all variables except ground reaction force (GRF). For walking, the only significant differences presented were for stride length on the right limb between 100% and 90% BW (p = 0.004) and 100% and 75% BW (p = 0.04) and time in stance on the left and right (p < 0.05). Pairwise comparisons revealed significant differences between the 100%, 90%, and 75% BW conditions for most gait parameters during jogging and running. These findings suggest that lower body weight percentages substantially influence gait mechanics and force production, especially as speed increases.

Adipose tissue stores energy in fat-rich adipocytes, which can produce and release several adipokines and modulate body metabolism. Exercise may induce adipokine production in adipocytes; however, the relationship between the two remains unclear. Few studies have shown the relationship between adipokines and strength training. Thus, we aimed to evaluate the acute and chronic effects of strength training (ST) on urinary adiponectin, leptin, and resistin levels. Twelve untrained young men (23.42 ± 2.67 years) were included in this study. Body composition was evaluated at baseline and after completing of the training protocol using densitometry. Training protocol consisted of three exercises with three sets of 65% of one-repetition maximum (1MR) with a pause of 90 s between sets, each exercise lasting 5 s (2 s concentric / 3 s eccentric). The sessions were carried out three times a week for 10 weeks. Urine was collected during the pre- and post-training in the first and 30th session. Adipokine levels were determined by ELISA. Urinary levels of leptin acutely increased after the first ST session, and after the last ST session. Chronic changes in the leptin levels were also found when comparing the values before the last ST and before the first ST session. Urinary adiponectin levels changed in the comparison of values before and after the last session. There was a significant increase in the adiponectin levels when comparing values after the first and last ST sessions. The levels of resistin chronically increased. Strength training can induce acute and chronic changes in urinary levels of adipokines.

[This corrects the article on p. 1191 in vol. 16, PMID: 38287936.].

This study investigates the longitudinal patterns of musculoskeletal injuries in an NCAA field hockey team, emphasizing the predictive value of index injuries on subsequent injury rates. Analyzing a dataset from a women's collegiate field hockey team, this research monitored 810 injuries across 124 athletes from 2008 to 2024. The study categorized injuries as local, nonlocal, and recurrent, employing a negative binomial regression to assess the impact of index injuries on the total number of career injuries. Results indicated that ankle sprains, hamstring strains, and back strains significantly predicted the total number of career injuries. Furthermore, the analysis revealed that the majority of subsequent injuries occurred within 69 days of the index injury, suggesting a critical window for targeted interventions. The findings underscore the need for robust longitudinal data and standardized reporting to enhance injury prevention strategies in field hockey.

This study aimed to evaluate the effectiveness of a flexible, trainee-driven training program in improving concurrent training outcomes for individuals training remotely. The study employed a repeated-measures, parallel group design with 18 participants randomized into either a control group with fixed workouts or an experimental group with flexible workout selection based on perceived readiness. Participants were recreationally trained at baseline. Over a 16-week period, both groups completed assessments of strength and endurance, including deadlift, push-ups, and a two-mile run. The results indicated no significant difference in overall fitness improvements between the two groups, with both showing meaningful progress in strength and endurance measures. However, adherence rates were notably lower in the flexible group as the study progressed, potentially due to decision fatigue. Statistical significance was set at ρ ≤ 0.05, with main effects of time showing significant improvement in fitness scores across all groups. The findings suggest that while flexible programming offers similar benefits to traditional fixed programs, it may require strategies to maintain adherence over longer periods. Practical applications include the potential for flexible training to be used effectively in remote settings, particularly for populations like military personnel with varying access to fitness resources.