Abstract:
:The aim of this study was to assess changes in indirect markers of muscle damage and type I collagen degradation, as well as, patellar and Achilles tendon morphological differences during nine daily drop-jumps sessions with constant load alternated with rapid increases in load to test the hypothesis that frequent drop-jump training results in negative muscular and tendon adaptation. Young men (n = 9) performed daily drop jump workouts with progression every 3 days in terms of number of jumps, platform height and squat amplitude. Voluntary and electrically evoked knee extensor torque, muscle soreness, blood plasma creatine kinase (CK) activity and carboxyterminal cross-linked telopeptide (ICTP), patellar and Achilles tendon thickness and cross-sectional area (CSA) were assessed at different time points during the training period and again on days 1, 3, 10 and 17 after the training. The findings were as follows: (1) steady decline in maximal muscle strength with major recovery within 24 hours after the first six daily training sessions; (2) larger decline in electrically induced muscle torque and prolonged recovery during last three training sessions; (3) increase in patellar and Achilles tendons CSA without change in thickness towards the end of training period; (4) increase in jump height but not in muscle strength after whole training period. Our findings suggest that frequent drop-jump sessions with constant load alternated with rapid increases in load do not induce severe muscle damage or major changes in tendons, nonetheless, this type of loading is not advisable for muscle strength improvement. Key pointsFrequent drop jump training induces activation mode dependent muscle torque depression late in the training period.No significant changes in the thickness of patellar and Achilles tendons are observed during frequent training, while CSA increases towards the end of training period.Longitudinal effect for jump height but not for muscle strength is evident after the whole training period.
journal_name
J Sports Sci Medjournal_title
Journal of sports science & medicineauthors
Paleckis V,Mickevičius M,Snieckus A,Streckis V,Pääsuke M,Rutkauskas S,Steponavičiūtė R,Skurvydas A,Kamandulis Ssubject
Has Abstractpub_date
2015-11-24 00:00:00pages
825-33issue
4issn
1303-2968journal_volume
14pub_type
杂志文章abstract::This study aimed to cross-validate the psychometric properties of the Basic Psychological Needs in Exercise Scale (BPNES) by Vlachopoulos and Michailidou, 2006 in a Spanish context. Two studies were conducted. Confirmatory factor analysis results confirmed the hypothesized three-factor solution In addition, we documen...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2012-03-01 00:00:00
abstract::We investigated the change of body composition in ultra- endurance runners during a multi-stage ultra-endurance run, the Isarrun 2006 in Bavaria, Germany, where athletes had to run 338 km within 5 days. Body mass, skin fold thicknesses and circumferences of extremities were measured in 21 well-experienced extreme endu...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2007-12-01 00:00:00
abstract::The Wingate all-out test (WAT) is commonly used to estimate anaerobic capabilities of athletes by using an upper or lower body cycle ergometer, however, a new test modality called elliptical all-out test (EAT) which measures activated whole-body locomotor tasks has recently been proposed. The purpose of this study was...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2013-09-01 00:00:00
abstract::The aim of the study was to establish the nutritional practices and activity patterns of elite female soccer players. The nutritional intake of 16 female England Soccer players was self-reported over a seven-day period. Participants were provided with written and verbal guidelines for the completion of the diaries. Tr...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2006-03-01 00:00:00
abstract::For the determination of ground reaction forces in alpine skiing, pressure insole (PI) systems and portable force plate (FP) systems are well known and widely used in previous studies. The purposes of this study were 1) to provide reference data for the vertical component of the ground reaction forces (vGRF) during al...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2011-12-01 00:00:00
abstract::Despite described benefits of aerobic high-intensity interval exercise (HIIE), the acute responses during different HIIE modes and associated health risks have only been sparsely discovered in heart disease patients. Therefore, the aim of this study was to investigate the acute responses for physiological parameters, ...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2016-02-23 00:00:00
abstract::This study examined the effects of a specific core exercise program, as a re-warm-up regime during the half-time period, on inspiratory (IM) and core (CM) muscle functions, leg perfusion and the team sport-specific sprint performance in the initial stage of the second half of a simulated exercise task. Nine team-sport...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章,随机对照试验
doi:
更新日期:2019-08-01 00:00:00
abstract::Despite the prevalence of shoulder injury in kayakers, limited published research examining associated upper limb kinematics and recruitment patterns exists. Altered muscle recruitment patterns on-ergometer vs. on-water kayaking were recently reported, however, mechanisms underlying changes remain to be elucidated. Th...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2012-09-01 00:00:00
abstract::The purpose of this investigation was to determine the effect of intermittent sub-maximal exercise on percent body fat (%BF) estimated by leg-to-leg bioelectrical impedance analysis (LBIA) in children. Fifty-nine children (29 girls; 30 boys) mean age 9.0 ± 1.3 years participated in this study. LBIA measured %BF values...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2006-09-01 00:00:00
abstract::Physical inactivity is a leading factor associated with cardiovascular disease and a major contributor to the global burden of disease in developed countries. Subjective mood states associated with acute exercise are likely to influence future exercise adherence and warrant further investigation. The present study exa...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2010-12-01 00:00:00
abstract::This study investigated the factorial validity of the 33-item self-rated Emotional Intelligence Scale (EIS: Schutte et al., 1998) for use with athletes. In stage 1, content validity of the EIS was assessed by a panel of experts (n = 9). Items were evaluated in terms of whether they assessed EI related to oneself and E...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2009-06-01 00:00:00
abstract::This study aimed to describe and compare the ventilation behavior during an incremental test utilizing three mathematical models and to compare the feature of ventilation curve fitted by the best mathematical model between aerobically trained (TR) and untrained (UT) men. Thirty five subjects underwent a treadmill test...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2008-09-01 00:00:00
abstract::There is increasing evidence that cardiorespiratory endurance (CRE) is declining among Chinese children and youth. The 20-meter shuttle run test (20-m SRT) is considered the most effective and widely used field-based measurement of CRE for children and youth worldwide. However, there have been few attempts to set 20-m...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2020-08-13 00:00:00
abstract::This study aimed to determine the effects of different acute creatine loadings (ACRL) on repeated cycle sprints. Twenty-eight active subjects divided into the control (n=7) and the experimental (n=21) group. The exercise protocol comprised three 30s Anaerobic Wingate Tests (AWT) interspersed with six minutes recovery,...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2003-09-01 00:00:00
abstract::The objectives of this study were 1) to describe the technical requirements of different tracks where classifying points are disputed for the Olympics as the European continent tracks (E), world championship competitions tracks (W), and Olympic Games track - Beijing, 2008- (O); and 2) to compare and establish differen...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2012-09-01 00:00:00
abstract::In this paper a four-ball-best-ball (4BBB) model for pairs of golf players is set up. The 4BBB match-play scoring system is seen to satisfy a basic requirement of fairness. It is shown that it is not strictly possible to rate individual players as 4BBB players. However, a (reasonably broad) class of individual players...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2010-03-01 00:00:00
abstract::High altitude exposure results in decreased oxygen pressure and an increased formation of reactive oxygen and nitrogen species (RONS), which is often associated with increases in oxidative damage to lipids, proteins and DNA. Exposure to high altitude appears to decrease the activity and effectiveness of antioxidant en...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章,评审
doi:
更新日期:2004-06-01 00:00:00
abstract::Glycerol-induced hyperhydration (GIH) prior to endurance exercise is a strategy that is increasingly used by athletes. Compared with water-induced hyperhydration (WIH), GIH has been shown to reduce diuresis, thereby increasing total body water (TBW). It has never been demonstrated that WIH proved to be more efficient ...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2002-09-01 00:00:00
abstract::The present study was conducted to study the morphological, physiological and biochemical characteristics of Indian National boxers as well as to assess the cardiovascular adaptation to graded exercise and actual boxing round. Two different studies were conducted. In the first study [N = 60, (junior boxers below-19 yr...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2006-07-01 00:00:00
abstract::The deceleration sub-phase during the back squat (BSQ) makes it difficult to stimulate the muscles throughout the full range of motion, and it has only been reported for one load during BSQ. The purpose of this study was to investigate whether a deceleration sub-phase occurs during BSQ with different loads and to asse...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2018-11-20 00:00:00
abstract::Golf has become an increasingly popular sport and a growing body of research trying to identify its main physical requirements is being published. The aim of this review was twofold: first, to examine the existing scientific literature regarding strength training and golf in healthy, non-injured, subjects; and second,...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2011-03-01 00:00:00
abstract::The main objective of this study was to perform a biomechanical analysis of three different sprint start patterns to determine the safest position in term of neck injury and Sport-Related Concussion (SRC). The second objective was to collect data on the learning process effect between football players and non-players....
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2014-05-01 00:00:00
abstract::Motor coordination and physical fitness are multidimensional concepts which cannot be reduced to a single variable. This study evaluated multivariate relationships among morphology, physical fitness and motor coordination in 74 pre-pubertal girls 8.0-8.9 years of age. Data included body dimensions, eight fitness items...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2018-05-14 00:00:00
abstract::The present study aimed to clarify the asymmetry between the dominant (DL) and non-dominant takeoff legs (NDL) in terms of lower limb behavior during running single leg jumps (RSJ) in collegiate male basketball players in relation to that of the jump height. Twenty-seven players performed maximal RSJ with a 6 m approa...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2014-12-01 00:00:00
abstract::The development of specific training designed to enhance physiological aspects of performance relies heavily on the availability of accurate and validity physiological data. In the combat sport of Wushu, katas are used to develop aerobic fitness. It is arguably important to assess and monitor heart rate (HR) and lacta...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2006-07-01 00:00:00
abstract::This study was made to analyze the variability and stability of the serve toss in tennis, on the x (side-to-side), y (back-to-front) and z (vertical) axes, with 12 experienced players under the influence of crosswind (induced aerodynamic flow) produced by an industrial ventilator. The players were analyzed individuall...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2013-06-01 00:00:00
abstract::This study investigated the acute inflammatory response to a repeat-sprint training session in hypoxia. Eleven amateur team-sport athletes completed a repeat-sprint training in hypoxia (RSH) protocol (4 sets of 4x4-s running sprints) in both normoxia and normobaric hypoxia (FiO2 0.145 to simulate an altitude of 3000 m...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2018-11-20 00:00:00
abstract::The primary purpose of this study was to identify potential risk factors for sports injuries in professional basketball. An observational retrospective cohort study involving a male professional basketball team, using game tracking data was conducted during three consecutive seasons. Thirty-three professional basketba...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2018-05-14 00:00:00
abstract::The objective was to compare the immediate effects of local cryotherapy (LC) and passive cross-body stretch on the extensibility of the posterior shoulder muscle in individuals with posterior shoulder tightness. Eighty-seven healthy subjects with a between-shoulder difference in internal rotation (IR) range of motion ...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2014-01-20 00:00:00
abstract::This was a placebo-controlled, double-blind study designed to evaluate the effect of a commercially available dietary supplement on upper-respiratory tract symptoms (URTI) and mood state. Seventy-five marathon runners (35 men, 40 women) ranging in age from 18-53 years, mean age: 36 ± 9, self-administered placebo, 250 ...
journal_title:Journal of sports science & medicine
pub_type: 杂志文章
doi:
更新日期:2009-12-01 00:00:00