Time course changes in hand grip strength performance and hand position sense in climbing

The aim of the present study was to determine the time course changes in hand grip strength performance and hand position sense in novice climbers after one bout of two minutes continuing climbing on an artificial vertical wall. In addition, the rate of perceived fatigue of the participant felt right after the trial was recorded. Sixty five novice climbers aged 20 to 22 years (age 20.50± 0.65 years), were randomly assigned into two training groups with different tests protocols, the Grip strength test group (n=23), versus Joint position sense test group (n=14), and two control groups (n=14 each). The training protocol included one bout of two minutes continuing climbing on an artificial wall for both training groups whereas the control groups did not receive any kind of training during the study. Subjects were pre and post-tested for the selected variables. Statistical analysis showed that the grip strength was significantly decreased only for the training group F(6,216) = 30.460, p < .0005, partial η2 = .489. Similarly, the rate of perceived exertion changed significant F(2,563, 41,001) = 24.397, p < .0005, partial η2 = 0.604, with the training group to be more tired than the control after two minutes continuing climbing. Also, the wrist position sense of training group significantly deteriorated at post-test with F(3,78)=2,977, p<.05, partial η2 = .103. In conclusion, the performance of novice climbers is affected by hand grip strength performance and joint position sense of the hand. In addition it was required almost ten minutes of rest for partial recovery. These variables can be addressed through training design giving attention to those physical abilities

Recovery kinetics of knee flexor and extensor strength after a football match

© 2015 The Authors. Published by PLOS. This is an open access article available under a Creative Commons licence. The published version can be accessed at the following link on the publisher’s website: https://doi.org/10.1371/journal.pone.0128072We examined the temporal changes of isokinetic strength performance of knee flexor (KF) and extensor (KE) strength after a football match. Players were randomly assigned to a control (N = 14, participated only in measurements and practices) or an experimental group (N = 20, participated also in a football match). Participants trained daily during the two days after the match. Match and training overload was monitored with GPS devices. Venous blood was sampled and muscle damage was assessed pre-match, post-match and at 12h, 36h and 60h post-match. Isometric strength as well as eccentric and concentric peak torque of knee flexors and extensors in both limbs (dominant and non-dominant) were measured on an isokinetic dynamometer at baseline and at 12h, 36h and 60h after the match. Functional (KFecc/KEcon) and conventional (KFcon/KEcon) ratios were then calculated. Only eccentric peak torque of knee flexors declined at 60h after the match in the control group. In the experimental group: a) isometric strength of knee extensors and knee flexors declined (P<0.05) at 12h (both limbs) and 36h (dominant limb only), b) eccentric and concentric peak torque of knee extensors and flexors declined (P<0.05) in both limbs for 36h at 60°/s and for 60h at 180°/s with eccentric peak torque of knee flexors demonstrating a greater (P<0.05) reduction than concentric peak torque, c) strength deterioration was greater (P<0.05) at 180°/s and in dominant limb, d) the functional ratio was more sensitive to match-induced fatigue demonstrating a more prolonged decline. Discriminant and regression analysis revealed that strength deterioration and recovery may be related to the amount of eccentric actions performed during the match and athletes' football-specific conditioning. Our data suggest that recovery kinetics of knee flexor and extensor strength after a football match demonstrate strength, limb and velocity specificity and may depend on match physical overload and players' physical conditioning level.Published versio

Effects of a soccer training session fatigue on balance ability

The purpose of the present study was to investigate the effects of a soccer training session on the balance ability of the young soccer players. Participants were twenty-six young soccer players. Standard testing balance boards and Biodex Stability System were used to assess balance ability before (pre-training) and immediately after (post-training) the completion of a soccer training session. Also, Isokinetic knee joint moment measurements (60°/sec and 180°/sec) were carried out pre- and post-soccer training. The results revealed that no differences (p>0.05) were found in balance ability and knee joint moment production between pre- and post-soccer training. Result is in contrast to the notion of a link between fatigue induced by a soccer training session or game and injury caused by impaired balance

Profile of dance aerobic instructors’ injuries, part I

Dance aerobic has been increasingly popular in the last years, engaging people of all ages, improving cardiovascular system and ameliorating psychological mood. Dance aerobic instructors guide, organize and entertain all classes suffering, thus, from a number of frequently appearing injuries. The purpose of this study was to investigate the incidence of muscular-skeletal injuries in female dance aerobic instructors in Greece. The sample of the study was constituted of 273 female aerobic instructors who were educated in public and state colleges of physical education and sports in Greece and were observed over a period of three years (2006-2009). For the statistical treatment of the data, the method used was the analysis of frequencies and the nonparametric test X2. According to the results, 57.1% of the instructors were injured, most of them (19.8%) were injured once, 69.2% twice and 11% three times. The injury rate was 0.18 injuries per aerobic instructor per year. Out of all injuries, 79.5% was overuse syndromes. The most frequent site of injury was the leg (33.7%) followed by the knee (27.5%) and the back (22.9%). Tendonitis (22.1%), compartment syndrome (15.6%), low back pain (13.4%), and sprain (16.3%), were the most common diagnoses. Further research is needed to correlate the injury rate in aerobic instructors to the external risk factors, in order to prevent the high injury rate that the present study has recorded. In conclusion lowering the risk of injuries still further will benefit both female dance aerobic instructors and participants by enabling a greater enjoyment of the sport, better fitness, and less cost to the individual and the community

Different isokinetic training frequencies for strengthening the knee extensors in novice collegiate downhill skiers

Comparaison des effets de trois protocoles de musculation isocinétique : 2 fois par jour, 1 séance quotidienne, 3 fois par semain

An Intelligent Injury Rehabilitation Guidance System for Recreational Runners Using Data Mining Algorithms

In recent years the number of people who exercise every day has increased dramatically. More precisely, due to COVID period many people have become recreational runners. Recreational running is a regular way to keep active and healthy at any age. Additionally, running is a popular physical exercise that offers numerous health advantages. However, recreational runners report a high incidence of musculoskeletal injuries due to running. The healthcare industry has been compelled to use information technology due to the quick rate of growth and developments in electronic systems, the internet, and telecommunications. Our proposed intelligent system uses data mining algorithms for the rehabilitation guidance of recreational runners with musculoskeletal discomfort. The system classifies recreational runners based on a questionnaire that has been built according to the severity, irritability, nature, stage, and stability model and advise them on the appropriate treatment plan/exercises to follow. Through rigorous testing across various case studies, our method has yielded highly promising results, underscoring its potential to significantly contribute to the well-being and rehabilitation of recreational runners facing musculoskeletal challenges