Sports Medicine, Training and Rehabilitation最新文献

Effect of an acute β‐adrenergic blockade on exercise intensity corresponding to the lactate minimum 急性β -肾上腺素能阻断对乳酸最低值运动强度的影响

Sports Medicine, Training and Rehabilitation Pub Date : 2001-01-01 DOI: 10.1080/15438620109512096

B. Denadai, P. Júnior, C. M. Neiva

{"title":"Effect of an acute β‐adrenergic blockade on exercise intensity corresponding to the lactate minimum","authors":"B. Denadai, P. Júnior, C. M. Neiva","doi":"10.1080/15438620109512096","DOIUrl":"https://doi.org/10.1080/15438620109512096","url":null,"abstract":"β‐Adrenoreceptor blockade is reported to impair endurance, power output and work capacity in healthy subjects and patients with hypertension. The purpose of this study was to investigate the effect in eighth athletic males of an acute β‐adrenergic blockade with propranolol on their individual power output corresponding to a defined lactate minimum (LM). Eight fit males (cyclist or triathlete) performed a protocol to determine the power output corresponding to their individual LM (defined from an incremental exercise test after a rapidly induced exercise lactic acidosis). This protocol was performed twice in a double‐blind randomized order by each athlete first ingesting propranolol (80 mg) and in a second trial a placebo, 120 minutes respectively prior to the test sequence. The blood lactate concentration obtained 7 minutes after anaerobic exercise (a Wingate test) was significantly lower after acute β‐adrenergic blockade (8.6 ± 1.6 mM) than under the placebo condition (11.7 ± 1.6 mM). The work rate at the LM was lowered from 215.0 ± 18.6 to 184.0 ± 18.6 watts and heart rate at the LM was reduced from 165 ± 1.5 to 132 ± 2.2 beats/minute as a result of the blockade. There was a non‐significant correlation (r = 0.29) between the power output at the LM with and without acute β‐adrenergic blockade. In conclusion, since the intensity corresponding to the LM is related to aerobic performance, the results of the present study, are able to explain in part, the reduction in aerobic power output produced during β‐adrenergic blockade.","PeriodicalId":403174,"journal":{"name":"Sports Medicine, Training and Rehabilitation","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128793075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Potassium Measurements During Hypokinesia and Ambulation in Establishing Potassium Changes in Trained and Untrained Subjects 在训练和未训练的受试者中，低运动和行走时的钾测量建立钾的变化

Sports Medicine, Training and Rehabilitation Pub Date : 2001-01-01 DOI: 10.1080/10578310127607

Y. Zorbas, V. L. Yarullin, S. D. Denogradov, V. B. Afonin, V. J. Kakurin

引用次数: 2

Effects of drop jump height and technique on ground reaction force with possible implication for injury 落跳高度和技术对地面反力的影响及其可能的伤害意义

Sports Medicine, Training and Rehabilitation Pub Date : 2001-01-01 DOI: 10.1080/15438620109512099

R. Newton, W. Young, W. Kraemer, C. Byrne

{"title":"Effects of drop jump height and technique on ground reaction force with possible implication for injury","authors":"R. Newton, W. Young, W. Kraemer, C. Byrne","doi":"10.1080/15438620109512099","DOIUrl":"https://doi.org/10.1080/15438620109512099","url":null,"abstract":"The purpose of this study was to quantify peak vertical ground reaction force (VGRF) and loading rate during performance of a drop jump when (a) attempting to jump for maximum height (DJ‐H) and (b) attempting to jump for maximum height and minimum ground contact time (DJ‐H/t), both common training techniques for athletes in a variety of sports. Peak VGRF's were between 7.59 and 9.37 times bodyweight for the DJ‐H/t technique, which was approximately twice the magnitude of the DJ‐H technique. The maximum rate of loading was also greater for DJ‐H/t. In an earlier related study it was observed that 3 subjects who trained with the DJ‐H/t method experienced lower limb pain, which prevented them from further training. These dropouts were compared to non‐dropouts on factors related to their pre‐training level of leg strength and training drop height. An index of drop height divided by leg strength was found to be significantly greater (p<0.05) for the dropouts. It was concluded that training to improve the DJ‐H/t technique imposes a relatively high stress on the leg musculo‐skeletal system. Alternatively, using a relatively high drop height in conjunction with a low pre‐training leg strength level also increases the risk of injury. Requiring an athlete to qualify for drop jump training by exceeding a standard passing score on the drop jump/leg strength index might enable strength and conditioning coaches to limit the injury risk during such plyometric training.","PeriodicalId":403174,"journal":{"name":"Sports Medicine, Training and Rehabilitation","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116253914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Assessment of Anaerobic Threshold as a Software Application Vilmed 2.0 in MS EXCEL 厌氧阈值评估软件应用于MS EXCEL 2.0

Sports Medicine, Training and Rehabilitation Pub Date : 2001-01-01 DOI: 10.1080/10578310210397

Pavel Kvca, Z. Vilikus

引用次数: 2

Physiological adaptation to 6 weeks of specific training of intercollegiate soccer players 校际足球运动员6周专项训练的生理适应

Sports Medicine, Training and Rehabilitation Pub Date : 2001-01-01 DOI: 10.1080/15438620109512097

J. Rico-Sanz, H. Silverman, D. Mccann, P. Molé

{"title":"Physiological adaptation to 6 weeks of specific training of intercollegiate soccer players","authors":"J. Rico-Sanz, H. Silverman, D. Mccann, P. Molé","doi":"10.1080/15438620109512097","DOIUrl":"https://doi.org/10.1080/15438620109512097","url":null,"abstract":"The purpose of this study was first to examine selected anthropometric and physiological characteristics of the outfield players of a soccer team according to playing position, and secondly to study the effects of a six week soccer training regimen on peak aerobic power (VO2peak), treadmill run‐time to exhaustion (TTE), percent body fat (%BF), and sum of skinfold thicknesses (SST). Twenty four outfield players of an intercollegiate soccer team [9 defenders (DF), 8 midfielders (MF), and 7 forwards (FW)] participated in the first part of the study, whereas only 17 players completed the training. Body weight and height were not different among playing positions. Also, no difference was found between player positions for: (a) %BF [DF = 9.9 ± 2.2(SD) MF=10.2 ± 5.7; FW=10.6 ± 4.1%], (b) VO2peak [DF = 55.9 ± 3.3; MF = 56.4 ± 5.2; FW = 52.9 ± 4.3ml · min−1 · kg−1], and (c) maximal ventilation rate [DF= 127.8 ± 11.8; MF= 119.1 ± 13.0; FW= 117.1 ±7.3 1·min−1]. The TTE was not different among groups. The VO2peak before training was 55.3 ± 4.3 ml · min−1· kg−1 and it increased (p≤.05) to 57.5±5.8 ml · min−1· kg−1 after training. TTE also increased (p≤.05) from 22.8 ± 3.0 min before to 25.2 ± 1.6 min after training. Although body mass (74.0 ± 6.4 kg) and % BF (9.8 ± 4.4%) remained unchanged during the training period, the SST decreased (p ≤ .05) from 60.9 ± 17.4 to 55.4 ± 14.0 mm. The results indicated no difference in selected anthropometric and physiological variables among playing positions. The loss of subcutaneous fat without a change in the total fat after six weeks of training in all players suggests there was a redistribution of fat storage.","PeriodicalId":403174,"journal":{"name":"Sports Medicine, Training and Rehabilitation","volume":"220 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127637363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Kinematical Analysis of Underwater Walking and Running 水下行走和跑步的运动学分析

Sports Medicine, Training and Rehabilitation Pub Date : 2001-01-01 DOI: 10.1080/10578310210396

Takeru Kato, Shohei Onishi, K. Kitagawa

引用次数: 45

Impedance cardiography for non‐invasive assessment of systolic time intervals during exercise 阻抗心动图用于无创评估运动期间的收缩时间间隔

Sports Medicine, Training and Rehabilitation Pub Date : 2001-01-01 DOI: 10.1080/15438620109512093

A. Crisafulli, F. Melis, V. Orrù, R. Lener, C. Lai, A. Concu

{"title":"Impedance cardiography for non‐invasive assessment of systolic time intervals during exercise","authors":"A. Crisafulli, F. Melis, V. Orrù, R. Lener, C. Lai, A. Concu","doi":"10.1080/15438620109512093","DOIUrl":"https://doi.org/10.1080/15438620109512093","url":null,"abstract":"Phono‐mechano‐cardiography (PMC) methodology for measuring such systolic time intervals (STI) as the pre‐ejection period (PEP), ventricular ejection time (VET) and the ratio (PEP/VET) is not an adequate method when STI are evaluated in an exercising subject (e.g. stress testing, functional capacity etc.). This is due to the complexity of positioning and keeping PMC transducers at the recording site secure while the body is moving. In this report a novel technique, impedance cardiography (IC), which does not require mechanical transducers being positioned over the body has been used to evaluate STI parameters in 6 subjects performing a cycle ergometer incremental exercise (10 W/min) up to 175 ± 12.5 W in order to compare IC traces with PMC traces obtained in the same session. The comparison of 460 recorded beats provided by both IC and PMC methods with proper statistic tests (correlation and linear regression, two‐way ANOVA, Fisher exact test) did not show any significant difference between the STI value obtained from IC and PMC methods respectively: PEPpmc = 0.13 ms + 0.99 ms PEPIC, p ≤0 0.0001, r = 0.92; VETpmc = 13.5ms + 0.95ms VETrc, p ≤ 0.0001, r = 0.98; PEP/VETpmc = 0.0036 + 0.85 PEP/VETic, p ≤ 0.0001, r = 0.84. Bland and Altman's (1986) analysis also showed a close agreement between the PEP, VET, PEP/VET ratio measured by PMC and IC instruments (mean differences were ‐ 0.89 ± 6.53 ms, 1.41 ± 6.67 ms, ‐0.0069 ± 0.33 respectively for PEP, VET and PEP/VET). It may be concluded that the IC system can be used in place of PMC to assess STI during exercise.","PeriodicalId":403174,"journal":{"name":"Sports Medicine, Training and Rehabilitation","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132689542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

The Influence of an Aircast Sports Stirrup Ankle Brace on the Ankle Joint Proprioception of Professional Soccer Players 气投式运动马镫踝关节支架对职业足球运动员踝关节本体感觉的影响

Sports Medicine, Training and Rehabilitation Pub Date : 2001-01-01 DOI: 10.1080/10578310127605

S. Bentham, J. Hatcher, I. Horsley, L. Mc nauthton

{"title":"The Influence of an Aircast Sports Stirrup Ankle Brace on the Ankle Joint Proprioception of Professional Soccer Players","authors":"S. Bentham, J. Hatcher, I. Horsley, L. Mc nauthton","doi":"10.1080/10578310127605","DOIUrl":"https://doi.org/10.1080/10578310127605","url":null,"abstract":"To date studies have indicated that an ankle brace not only provides mechanical support, but also has a positive influence on ankle joint proprioception. However, it is still unclear whether this finding is correct, especially in professional soccer players. The aim of this work therefore, was to determine whether an Aircast Sports Stirrup ankle brace would influence ankle joint proprioception of the professional soccer player. Twelve male professional soccer players with no history of recent ankle injury participated in this study. A Biodex Stability System was used to test a players balance on their dominant leg with and without a brace attached. Each subject was tested three times for each condition in a random fashion, so that a mean Stability Index (SI) could be electronically generated. The more difficulty a subject had in balancing the Biodex tilt platform the larger was the numerical score on the index. The results revealed that bracing had no significant effect (p > 0.05) on ankle joint proprioception indicated by the mean balance index, of the professional soccer player. This result casts doubt on previous literature on this topic and indicates that further study of the effect of bracing is needed.","PeriodicalId":403174,"journal":{"name":"Sports Medicine, Training and Rehabilitation","volume":"30 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120844997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

A comparison of leg‐to‐leg bioelectrical impedance and underwater weighing methods in measuring body composition in Caucasian and African American football athletes 腿对腿的生物电阻抗和水下称重方法在测量白人和非洲裔美国足球运动员身体成分的比较

Sports Medicine, Training and Rehabilitation Pub Date : 2001-01-01 DOI: 10.1080/15438620109512100

D. Brock, D. Nieman, A. Utter, Gregory S Harris, Stephen J. Rossi

{"title":"A comparison of leg‐to‐leg bioelectrical impedance and underwater weighing methods in measuring body composition in Caucasian and African American football athletes","authors":"D. Brock, D. Nieman, A. Utter, Gregory S Harris, Stephen J. Rossi","doi":"10.1080/15438620109512100","DOIUrl":"https://doi.org/10.1080/15438620109512100","url":null,"abstract":"The purpose of this study was to validate leg‐to‐leg bioelectrical impedance analysis (BIA) methodology for estimating body composition in ethnically mixed football athletes. Sixty‐four Caucasian and 36 African American Division 1AA football athletes took part in this study. Their mean age ± SD was 20.2 ± 1.9 yr and their body mass index was 29.2 ± 4.8 kg/m2. Age, body mass index, and percent body fat did not differ significantly between ethnic groups. Fat free mass (FFM) and percent body fat was also estimated from underwater weighing (UW), seven‐site skinfold measurement (SK), and B1A. A significant correlation in estimating FFM was found between underwater weighing and BIA (r = 0.94, p< 0.001; SEE 3.7 kg), and between underwater weighing and skinfold thickness measurement (r = 0.97, p < 0.001; SEE 2.6 kg). The mean difference in estimation of FFM between underwater weighing and BIA was — 0.46±3.8kg. No significant correlation (r = 0.10, p = .166) was found between the estimation of FFM from underwater weighing and the difference in estimation of FFM between underwater weighing and BIA. This indicated there was no systematic underestimation or overestimation of FFM in either Caucasian or African American athletes. In conclusion, the leg‐to‐leg BIA system provided a quick and accurate method of determining body composition in football athletes compared to conventional underwater weighing.","PeriodicalId":403174,"journal":{"name":"Sports Medicine, Training and Rehabilitation","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129764403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

A Comparison of Ratings of Perceived Exertion During Deep Water Running and Treadmill Running: Considerations in the Prescription of Exercise Intensity 深水跑步和跑步机跑步中感知力量等级的比较:运动强度处方的考虑

Sports Medicine, Training and Rehabilitation Pub Date : 2001-01-01 DOI: 10.1080/10578310127608

Martyn J. Matthews, N. Airey

{"title":"A Comparison of Ratings of Perceived Exertion During Deep Water Running and Treadmill Running: Considerations in the Prescription of Exercise Intensity","authors":"Martyn J. Matthews, N. Airey","doi":"10.1080/10578310127608","DOIUrl":"https://doi.org/10.1080/10578310127608","url":null,"abstract":"Deep water running (DWR) is a form a aquatic exercise that simulates the action of land based running (LBR), but appears to cause less musculo-skeletal stress. Consequently, it has become a popular training modality for athletes recovering from injury. The psychophysical effects of DWR and LBR respectively were investigated at three exercise intensities. Maximum heart rate (HR max ) was established using a Cooper 1.5 mile run test and the Karvonen Heart Rate Reserve (HRR) method was used to calculate exercise intensity at 60%, 70%, and 80% HRR, respectively. Six males and four females with a mean age (‐SD) of 28.1 ‐ 4.9 years and unfamiliar with DWR undertook a 30-minute test in both DWR and LBR conditions. Each test consisted of 3 x 10 minute periods at 60%, 70%, and 80% HRR respectively. Rating of Perceived Exertion (RPE) was recorded during the last minute of each period. A difference in RPE was found between LBR and DWR at 60% (11.4 Vs 12.8, p < 0.001), 70% (12.9 Vs 15.2, p < 0.001), and 80% HRR (14.5 Vs 17.7, p < 0.001). A significant difference in RPE was attributed to localized fatigue associated with the unfamiliarity of the task, reflected by increased cardiovascular stress at any given heart rate. Athletes and trainers should exhibit caution when prescribing a specific DWR exercise intensity based on HR max date obtained from a land based test. A downward adjustment of 12n17 beats per minute is considered prudent to ensure that exercise intensity is appropriate to the goal of the training program and to the traineeis current ability.","PeriodicalId":403174,"journal":{"name":"Sports Medicine, Training and Rehabilitation","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121724594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7