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1.
《European Journal of Sport Science》2013,13(2):167-172
AbstractThe continuous execution of swimming techniques may cause muscle imbalances in shoulder rotators leading to injury. However, there is a lack of published research studies on this topic. The aim of this study was to analyze the influence of a competitive swim period on the shoulder rotator–cuff balance in young swimmers. A randomized controlled pretest–posttest design was used, with two measurements performed during the first macrocycle of the swimming season (baseline and 16 weeks). Twenty-seven young male swimmers (experimental group) and 22 male students who were not involved in swim training (control group) with the same characteristics were evaluated. Peak torque of shoulder internal and external rotators was assessed. Concentric action at 1.04 rad s?1 (3 repetitions) and 3.14 rad s?1 (20 repetitions) was measured using an isokinetic dynamometer (Biodex System 3). External/internal rotators strength ratios were also obtained. For both protocols, there were significant training effects on internal rotator strength and external/internal rotator ratios (p ≤ .05). This trend was the same for both shoulders. Within-group analysis showed significant changes from baseline to 16 weeks for internal rotators strength and unilateral ratios of the experimental group. Swimmers' internal rotator strength levels increased significantly. In contrast, a significant decrease of the unilateral ratios was observed. Findings suggest that a competitive swim macrocycle leads to an increase in muscular imbalances in the shoulder rotators of young competitive swimmers. Swimming coaches should consider implementing a compensatory strength-training program. 相似文献
2.
《European Journal of Sport Science》2013,13(1):112-125
Abstract Poor muscle strength and physical function have been associated with higher risk of hospitalisation and lower well-being among the elderly. Physical training increases muscle strength, endurance and physical function as well as psychological outcomes. Exercise among older adults is often used to improve these variables, but few have compared the effects of different types of training in parallel independent groups. Thus, the aim of the present study was to investigate the effect of three different types of training on body composition, muscle strength, physical function and well-being in the elderly. A total of 118 community-dwelling older adults (mean age 74.3, s=4.6 years, 68% women) completed a 13-week randomised controlled exercise-trial involving four groups: traditional strength training (STG), functional strength training (FTG), endurance training (ETG) and control (CON). Stair climb with load improved more in FTG than CON (P<0.05), and the two strength groups performed better in the functional upper body test (P<0.05). STG increased strength more than CON in all exercises (P<0.001), while FTG increased strength more than CON in the chest press, shoulder press and knee extension (P<0.05). Lean body mass (LBM) increased in all training groups, which differed significantly from CON (P<0.05). ETG decreased their fat mass compared to CON (P<0.001). The only significant effect on well-being indices was improved life satisfaction in FTG at week 5 (P<0.05). We also observed significant correlations between change in some of the functional tests and change in positive affect. All three types of training can enhance physical capacity. Functional strength training can be a cost effective form of training in terms of less demand for instructors and equipment and could be an effective way to improve physical function, strength and indices of well-being in the elderly. 相似文献
3.
《European Journal of Sport Science》2013,13(8):764-772
AbstractDuring the repeated execution of the swimming strokes, the shoulder adductor and internal rotator muscles have a tendency to become proportionally stronger when compared to their antagonist group. This can lead to muscle imbalances. The aim of this study was to examine the effects of a compensatory training programme on the strength and balance of shoulder rotator muscles in young swimmers. A randomized controlled trial design was used. Forty male swimmers took part in the study and were randomly divided into two groups: an experimental group (n?=?20) and a training group (n?=?20). A control group (n?=?16) of young sedentary male students was also evaluated. The experimental group subjects participated in a 16-week shoulder-strength programme with Thera-Band® elastic bands; the training group was restricted to aquatic training. Peak torque of shoulder internal rotator and external rotator (ER) was measured at baseline and after 16 weeks. Concentric action at 1.04?rad?s?1 (3 reps) and 3.14?rad?s?1 (20 reps) was measured using an isokinetic dynamometer. The strength-training programme led to an improvement of the ER strength and shoulder rotator balance in the experimental group (data from both shoulders at 1.04?rad?s?1). Moreover, concentric action at 3.14?rad?s?1 presented significant differences only for the dominant shoulder. Findings suggest that the prescribed shoulder-strengthening exercises could be a useful training option for young competitive swimmers. They can produce an increase in absolute strength values and greater muscle balance in shoulder rotators. 相似文献
4.
为研究体操运动员肩关节肌肉力量,采用美国研制的CyBex-6000型测力仪,对我国17名女子体操运动员右肩关节进行屈伸肌群的等动向心收缩测试(60°/s、240°/s)。受试者包括国际健将级4名、国家健将级6名和国家一级7名。比较受试者的肌力水平表明,运动水平高的运动员肩关节肌肉力量较高。本研究获得了不同等级的运动员肩关节屈伸肌群的基础数据,为体操运动员的力量训练及康复医疗提供理论依据。 相似文献
5.
Amanda P. Silvatti Karine J. Sarro Pietro Cerveri Guido Baroni Ricardo M. L. Barros 《Journal of sports sciences》2013,31(14):1551-1560
Abstract The purpose of this paper was to understand which differences long-term swimming training can cause on trunk mechanics during breathing and how these differences are related to the years of swimming training. The variations and coordination among trunk compartments were considered as target movement patterns. Video-based plethysmography was utilised for data acquisition and pre-processing. A group of swimmers, who followed a long-term intensive swimming training previously to this study, was compared with a non-swimmer control group. The participants of both groups performed quiet breathing and vital capacity tests. From the compartmental volumes associated with each breathing curves, the relative amplitude and cross-correlation among these volumetric time-varying signals were calculated, in order to analyse the relative partial volume variation and the coordination among trunk compartments involved in respiration. The results of a Mixed-ANOVA test (P ≤ 0.05) revealed higher coefficient of variation (P < 0.001) and correlations among trunk compartments in the swimmers group when vital capacity was performed. Significant linear regression was found between the years of swim training and the coefficients of variation and correlation. The results suggest that after long periods of intensive swim training, athletes might develop specific breathing patterns featuring higher volume variations in the abdominal region and more coordination among compartments involved in forced respiratory tasks such as vital capacity. 相似文献
6.
Gary Kamen 《Research quarterly for exercise and sport》2013,84(1):3-8
Abstract During the earliest stages of resistance exercise training, initial muscular strength gains occur too rapidly to be explained solely by muscle-based mechanisms. However, increases in surface-based EMG amplitude as well as motor unit discharge rate provide some insight to the existence of neural mechanisms in the earliest phases of resistance exercise training. Moreover, other phenomena such as the cross transfer of strength following unilateral exercise and neural changes following limb immobilization also support a role for neural control in muscular strength. While studies to date have focused on the phenomenon of neural change, future studies will need to focus on the many motoneuron influences as well as intrinsic motoneuronal properties that may be responsible for these neural adaptations. 相似文献
7.
Abstract Few studies of young competitive swimmers have measured the swimmer in the water, but many have utilized the treadmill or bicycle ergometer on land. The maximum oxygen uptake of 31 (17 male and 14 female) competitive swimmers, 9 to 17 years of age, was determined during an intermittent tethered swimming test which consisted of a series of 3-minute workloads followed by 3-minute rest intervals. Each new workload was increased by multiples of 1.1 kg, and the work was continued to voluntary exhaustion. The subjects were members of a competitive swim club that took part in vigorous swim training throughout the year. Testing was conducted at the peak of the competitive out-door season. Over a period of a year, the daily training distance of these swimmers averaged approximately 7,000 yards, or almost four times that reported by others. The mean maximum oxygen uptake was 48.8 ml·kg?1·min?1 for the females and 55.8 ml·kg?1·min?1 for the males. Although the values for the younger swimmers were comparable with other published studies, the older male and female swimmers exhibited consistently higher values. The natural decline in maximum oxygen uptake per unit weight (ml/kg) reported by others in pubescent females was reversed by the over-distance training in the present study. 相似文献
8.
Marilyn Hinson William C. Smith Sandy Funk 《Research quarterly for exercise and sport》2013,84(3):529-530
Abstract The problem of the study was to investigate the relationship between maximum strength and muscular endurance; also the relationship between maximum strength and percentage of maximum strength held before and after an extended period of isometric training. The subjects (N = 60) were divided into two equal groups, control and experimental. The experimental group was further divided into two subgroups of high and low strength. The control group was tested for maximum strength and endurance once at the beginning of the experiment and once after 20 days. The subjects in the experimental group were tested for maximum strength and endurance before they embarked on a 20-day period of isometric training. They held tension for 100 sec. in the morning and again in the afternoon. Periodic tests were on the 5th, 10th, 15th, and 20th day. There was a significant relationship between maximum strength and endurance and a negative and generally significant relationship between maximum strength and percentage of maximum strength held. 相似文献
9.
10.
Effects of Various Periods of Inactivity on Retention of Newly Acquired Levels of Muscular Endurance
Abstract Male university students (N = 54) engaged in an 8-week training program with sessions held three times per week. Each session consisted of one “all-out” bout of right elbow flexion on an arm lever ergometer against a resistance of 11.03 lbs. at a work rate of 40 repetitions per minute. Following the training phase of the study, the subjects were randomly assigned to three experimental groups and ceased training for either 8, 10, or 12 weeks. At the conclusion of the inactivity period, each subject retrained until his peak performance of the training program had been equaled or exceeded. The analysis of data revealed that no difference existed among the groups: (a) at the beginning of the training program, (b) at the termination of the training program, (c) following the various inactivity periods, and (d) in the number of sessions needed to retrain to the peak performance attained during the training period. The within-group analysis indicated that each group had experienced: (a) significant muscular endurance development during the training period, (b) significant loss of endurance during the period of inactivity, and (c) significant retention of the newly acquired endurance over the inactivity period. Peak performance during the retraining phase was achieved in approximately one-fourth the number of training sessions initially required to attain the same level during the developmental phase. 相似文献
11.
Gareth Irwin 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(2):131-144
Abstract The aim of this study was to determine if critical parameters for elite performance could be identified among a population of female shot putters. The performance of seven of the top women shot putters competing at the 2002 USA National Championships was examined. Video data were captured using two Panasonic 60 Hz cameras and the best throws of each athlete were digitized and analyzed using a Peak Motus three‐dimensional motion analysis system. Thirty variables were examined for their effect on the distance of the throw. Correlation analysis indicated that measured distance was positively correlated with release speed (r = 0.97, p < 0.0003) and shoulder‐hip separation (r = 0.72, p < 0.06) and negatively correlated with release angle (r = ‐0.74, p < 0.056), rear knee angle at rear foot touchdown (r = ‐0.93, p < 0.003) and rear knee angle at release (r = ‐0.76, p < 0.047). Greater knee flexion angle at both rear foot touch down and release along with a neutral shoulder‐hip angle at release were identified as the most critical parameters for success among this sample of elite women shot putters. The unique observation about the knee positions at specific events should assist in new training and coaching developments. 相似文献
12.
John R. Key 《Research quarterly for exercise and sport》2013,84(4):559-565
Abstract The purpose of this study was to investigate the effect of load on swimming endurance in humans. Twenty male subjects between the ages of 17 and 24 swam in a vertical to semi-vertical position (treaded water using arms and legs) until exhausted or until an hour had elapsed. This was done with loads of 0, 2, 4, 6, 8, 10, 15, 20, 25, and 30 percent of the body weight. The lead used as a weight was placed around the waist of the swimmer. The times were recorded at each load and the means determined and plotted. The relationship between load and endurance was close and curvilinear. Heavier individuals were at a slight disadvantage in this swimming test which used percentage of body weight as a measure of load. Among good swimmers a load of 4 percent of the body weight did not decrease swim time appreciably, while a load of 30 percent reduced swim time to a matter of seconds. 相似文献
13.
Abstract The effect of one and three coactors on an individual's performance of a muscular endurance task was determined for 8-, 13-, and 18-year-old males. Subjects extended the dominant leg in a horizontal position for as long as possible under one of three conditions: alone, in pairs, and in groups of four. Results showed that individuals in quadrads performed significantly better than individuals in dyads and alone. No significant difference was found between individuals performing alone and in dyads. Eight-year-olds were found to be superior to the two older age groups, but the age factor was independent of the coaction effect. 相似文献
14.
Abstract In this study, a strength test for boys 9 through 12 years of age in grades 4, 5, and 6 was constructed based upon cable tension strength tests. From 18 cable tension strength tests, the following four were selected by multiple correlation procedures: shoulder extension, trunk extension, knee extension, and ankle plantar flexion (ankle extension). The total of these four tests was designated the strength composite. Norms were prepared based on age and weight, utilizing Roger's method in the construction of Strength Index norms; the subjects were 826 boys from ten communities located in various parts of Oregon. A strength quotient was derived by dividing the achieved by the norm strength composite and multiplying by 100. 相似文献
15.
Abstract The purpose of the study was to determine whether there are differences in kinematics between sprint and distance front crawl specialists when swimming at a distance pace using a six beat kick. Seven sprint and eight distance male specialists performed one maximum 400 m swim through a 6.75 m3 calibrated space recorded by six gen-locked cameras. The following variables were calculated: average swim velocity, stroke length, stroke frequency, upper limb and foot displacement, elbow angle, the shoulder and hip roll angle, duration of the stroke phases and time corresponding to particular events within the stroke cycle relative to hand entry. Differences between the groups were assessed by an independent t-test and effect size (d) calculations for each variable. The groups only differed significantly with respect to the average swim velocity, with the distance swimmers maintaining a greater velocity throughout the 400 m. However, effect sizes were moderate for elbow angle range during the pull phase (d = 0.78) and the total hip roll magnitude (d = 0.76). There was little evidence to suggest that sprint and distance swimmers using a six beat kick pattern differ in technique when swimming at a distance pace and therefore coaches should not encourage the development of different techniques between these groups. 相似文献
16.
The purpose of this study was to determine whether the sequence of strength training before endurance training (ST/ET) is more or less effective than endurance training followed by strength training (ET/ST). Twenty‐three females and 11 males were assigned to one of three groups: ST/ET (n= 15), ET/ST (n= 15) or control (n = 4). The 7‐week training programme consisted of strength training using 10 exercises for two sets of 3–12 repetitions and running for 20–25 min at 60–90% of heart rate reserve. Maximal oxygen uptake (VO2 max) was measured during a graded treadmill test, and muscular strength was assessed using one‐repetition maximum tests for the bench press (BP), shoulder press (SP), arm curl (AC) and leg press (LP). The VO2 max significantly (P < 0.05) increased 6.7 and 6.2% for the ST/ET and ET/ST groups, respectively. There was no significant (P > 0.05) difference between the two experimental groups. Muscular strength significantly (P <0.05) improved by 15.2% (BP), 16.6% (SP), 17.2% (AC) and 11.9% (LP) for the ST/ET group and 19.9% (BP), 24.1% (SP), 20.9% (AC) and 14.0% (LP) for the ET/ST group. There were no significant (P > 0.05) differences between the two experimental groups for the BP, AC and LP; however, the ET/ST group increased (P < 0.05) SP strength more than the ST/ET group. In conclusion, adaptations to a combination of short‐term endurance and strength training as assessed by VO2 max and BP, AC and LP strength appear to be independent of whether endurance training occurs prior to or following strength training. 相似文献
17.
William J. Rutherford PhD Charles B. Corbin 《Research quarterly for exercise and sport》2013,84(2):110-119
Abstract The purpose of this study was to establish criterion-referenced standards for selected tests of arm and shoulder girdle strength and endurance for college females. Several popular tests of arm and shoulder girdle strength and endurance were administered to equal numbers of trained and untrained college females (N = 92) to generate data for the analysis. The contrasting groups method (Berk, 1976; Safrit & Wood, 1990) yielded the following criterion cutoff scores that classified college females as trained or untrained on the basis of regular upper arm and shoulder girdle resistance training: pull-ups = .5 repetitions (reps), 90° push-ups = 16 reps, flexed arm hang = 5s, seated chest press = 24.5 kg, seated biceps curl = 16.4 kg, seated lat pull (latissmus dorsi pull-down) = 38.2 kg, absolute strength index = 86.4 kg, and relative strength index = .6 kg per kg of body weight. Cross-validation of the standards on an independent sample of college females (N = 112) suggested stability of the cutoff scores for pull-ups, flexed arm hang, and relative strength. 相似文献
18.
Luke Hogarth Carl Payton Peter Van De Vliet Brendan Burkett 《Journal of sports sciences》2020,38(8):839-847
ABSTRACTSwimmers with limb deficiency are a core population within Para Swimming, accordingly this study examined the contribution of limb segments to race performance in these swimmers. Data were obtained for 174 male Para swimmers with limb deficiency. Ensemble partial least squares regression showed accurate predictions when using relative limb segment lengths to estimate Para swimmers’ personal best race performances. The contribution of limb segments to performance in swim events was estimated using these regression models. The analysis found swim stroke and event distance to influence the contributions of limb segments to performance. For freestyle swim events, these changes were primarily due to the increased importance of the hand, and decreased importance of the foot and shank, as the distance of the event increased. When comparing swim strokes, higher importance of the thigh and shank in the 100 m breaststroke compared with other swim strokes confirms the separate SB class. Varied contributions of the hand, upper arm and foot suggest that freestyle could also be separated from backstroke and butterfly events to promote fairer classification. This study shows that swim stroke and event distance influence the activity limitation of Para swimmers with limb deficiency suggesting classification should account for these factors. 相似文献
19.
Allen Jackson Andrew S. Jackson Ronald G. Frankiewicz 《Research quarterly for exercise and sport》2013,84(4):641-648
This study investigated the construct and concurrent validity of a 12-minute crawl stroke swim as a field test of swimming endurance. A sample of 42 male college students who ranged from certified life savers to competitive swimmers were administered three tests. The first, a multistage swimming endurance test, required that a tethered subject swim to exhaustion under a linear progressive increase in workload. The second measure was the crawl stroke count for two lengths of a 25-yard pool. The third test was a 12-minute crawl stroke swim for distance with total distance and distance covered each minute recorded for each subject. Alpha factor analysis of the 12 minute intervals of the crawl stroke swim produced one factor which demonstrated that swimming performance was internally consistent during the 12-minute swim. There was a correlation of .898 (p < .01) between the 12-minute swim and the tethered swim test. Cross validity procedures demonstrated a high degree of stability for the correlation between the 12-minute swim and the tethered swim and for resulting regression statistics. The construct validity was established for both the multistage test and the 12-minute swim using the known groups approach. On the basis of the data the 12-minute swim is a valid field test for swimming endurance for the population studied. 相似文献
20.
Muscular strength, endurance, and rate of fatigue were studied in populations of various ages actively engaged in strength and endurance training, as compared with those not engaged in such activities. The strength and fatigability of the elbow flexor muscles were studied for 62 subjects at the ages of 20 (n = 11 active, 10 inactive), 35 (n = 11 active, 10 inactive), and 50 (n = 10 active, 10 inactive) years, tested within 2 years of the appropriate age. They performed a 6-min bout of maximal rhythmic contractions of the dominant arm at a rate of 30 contractions per min. Force applied to the transducer was converted into electrical activity and transmitted to a recorder, where differences in mean values for initial strength, final strength, absolute endurance, and relative endurance were examined for significance. Rates of fatigue and the fatigue curves were also obtained for each group. Results revealed significantly less muscular strength, absolute endurance, and relative endurance as the age of the subjects increased, but no significant difference for age was found in final strength at the conclusion of the exercise bout. Significant differences were found between active and inactive subjects in initial strength, final strength, and absolute endurance in favor of the active subjects. No significant interaction between activity level and age was found for any of the dependent variables. The rates of fatigue were similar for all ages except for the inactive 20-year-old subjects, whose rate of fatigue was markedly slower than that found for all other groups of subjects.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献