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  • 1.
    Armakolas, Athanasios
    et al.
    Department of Experimental Physiology, Medical School, University of Athens.
    Stathopoulos, George P.
    First Oncology Clinic, Errikos Dunant Hospital, Athens.
    Nezos, Adrianos
    Department of Experimental Physiology, Medical School, University of Athens.
    Theos, Apostolos
    Department of Experimental Physiology, Medical School, University of Athens.
    Stathaki, Martha
    Department of Experimental Physiology, Medical School, University of Athens.
    Koutsilieris, Michael
    Department of Experimental Physiology, Medical School, University of Athens.
    Subdivision of molecularly-classified groups by new gene signatures in breast cancer patients2012In: Oncology Reports, ISSN 1021-335X, E-ISSN 1791-2431, Vol. 28, no 6, p. 2255-2263Article in journal (Refereed)
    Abstract [en]

    Gene expression patterns as well as gene interactions are under investigation for their involvement in tumour heterogeneity. The molecular classification of breast cancer based on hormone receptor expression, grade and HER2 receptor levels, is indicative but not adequate enough to complete the prognostic data. The objectives of this study were to validate the prognostic value of 19 genes, solely, and as parts of classifiers (sets of genes), in breast cancer patients and to determine whether the expression of these genes and classifiers is correlated with breast cancer molecular classification. Gene expression was examined in the blood of 88 breast cancer patients and 50 healthy controls using multiplex quantitative real-time PCR. Patients with a second primary malignancy showed a statistically significant difference when compared with: i) patients with a single breast cancer, for an 8-gene classifier (p<0.02); and ii) healthy individuals (classifier FBX033, FLJ339115) (p<0.01), with respect to gene expression. The classifier ENY2, USP38 was associated with the development of primary breast cancer. A newly established classifier (ENY2, USP38, RPS7, Osbpl-1 and ETF1) indicated a statistically significant association with HER2 subtype patients, compared to patients with a different molecular classification (p<0.04). The gene FLJ33915 was differentially expressed in a subgroup of HER2-positive patients with infiltrated axillary lymph nodes (p<0.028). We validated the prognostic value of 4 classifiers for primary and second primary malignancy. Evidence of a classifier predicting the HER2 subtype and the gene FLJ33915 which subdivides HER2 subtype patients is also presented.

  • 2.
    Bogdanis, Gregory C.
    et al.
    Faculty of Physical Education & Sports Science, University of Athens.
    Papaspyrou, Aggeliki
    Faculty of Physical Education & Sports Science, University of Athens.
    Souglis, Athanasios
    Faculty of Physical Education & Sports Science, University of Athens.
    Theos, Apostolos
    Faculty of Physical Education & Sports Science, University of Athens.
    Sotiropoulos, Aristomenis
    Faculty of Physical Education & Sports Science, University of Athens.
    Maridaki, Maria
    Faculty of Physical Education & Sports Science, University of Athens.
    Effects of a hypertrophy and a maximal training program on speed, force and power of soccer players2008In: Science and Football, VI: The Proceedings of the Sixth World Congress on Science and Football / [ed] Tom Reilly and Feza Korkusuz, Routledge, 2008, p. 290-295Chapter in book (Refereed)
  • 3.
    Bogdanis, Gregory C.
    et al.
    Faculty of Physical Educaation & Sports Science, University of Athens.
    Papaspyrou, Aggeliki
    Faculty of Physical Educaation & Sports Science, University of Athens.
    Souglis, Athanasios
    Faculty of Physical Educaation & Sports Science, University of Athens.
    Theos, Apostolos
    Faculty of Physical Educaation & Sports Science, University of Athens.
    Sotiropoulos, Aristomenis
    Faculty of Physical Educaation & Sports Science, University of Athens.
    Maridaki, Maria
    Faculty of Physical Educaation & Sports Science, University of Athens.
    Effects of two different half-squat training programs on fatigue during repeated cycling sprints in soccer players2011In: Journal of Strength and Conditioning Research, ISSN 1064-8011, E-ISSN 1533-4287, Vol. 5, no 7, p. 1849-1856Article in journal (Refereed)
    Abstract [en]

    This study compared the effects of two different half-squat training programs on the repeated-sprint ability of soccer players during the preseason. Twenty male professional soccer players were divided into 2 groups: One group (S-group) performed 4 sets of 5 repetitions with 90% of their 1-repetition maximum (1RM), and the other group (H-group) performed 4 sets of 12 repetitions with 70% of 1RM, 3 times per week for 6 weeks, in addition to their common preseason training program. Repeated-sprint ability was assessed before and after training by 10 × 6-second cycle ergometer sprints separated by 24 seconds of passive recovery. Maximal half-squat strength increased significantly in both groups (p < 0.01), but this increase was significantly greater in the S-group compared with the H-group (17.3 ± 1.9 vs. 11.0 ± 1.9%, p < 0.05). Lean leg volume (LLV) increased only in the H-group. Total work over the 10 sprints improved in both groups after training, but this increase was significantly greater in the second half (8.9 ± 2.6%) compared with the first half of the sprint test (3.2 ± 1.7%) only in the S-group. Mean power output (MPO) expressed per liter of LLV was better maintained during the last 6 sprints posttraining only in the S-group, whereas there was no change in MPO per LLV in the H-group over the 10 sprints. These results suggest that resistance training with high loads is superior to a moderate-load program, because it increases strength without a change in muscle mass and also results in a greater improvement in repeated sprint ability. Therefore, resistance training with high loads may be preferable when the aim is to improve maximal strength and fatigue during sprinting in professional soccer players.

  • 4.
    Bogdanis, Gregory C.
    et al.
    Faculty of Physical Education & Sport Science, Uniersity of Athens.
    Papaspyrou, Aggeliki
    Faculty of Physical Education & Sport Science, Uniersity of Athens.
    Theos, Apostolos
    Faculty of Physical Education & Sport Science, Uniersity of Athens.
    Maridaki, Maria
    Faculty of Physical Education & Sport Science, Uniersity of Athens.
    Influence of resistive load on power output and fatigue during intermittent sprint cycling exercise in children2007In: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327, Vol. 101, no 3, p. 313-320Article in journal (Refereed)
    Abstract [en]

    This study examined the effects of two resistive loads on fatigue during repeated sprints in children. Twelve 11.8 (0.2) year old boys performed a force-velocity test to determine the load (Fopt) corresponding to the optimal pedal rate. On two separate occasions, ten 6-s sprints interspersed with 24-s recovery intervals were performed on a friction-loaded cycle ergometer, against a load equal to Fopt or 50%Fopt. Although mean power output (MPO) was higher in the Fopt [397 (24) and 356 (19) W, P < 0.01], the decline in MPO over the 10 sprints was similar in Fopt [8.8 (1.9) %] and 50%Fopt [9.0 (2.4) %]. In contrast, peak power (PPO) was not different in sprint 1 between the two conditions [459 (24) and 460 (28) W], but was decreased only in 50%Fopt [11.4 (3.2) %, P < 0.01], while it was maintained in the Fopt despite the higher total work during each sprint. Fatigue within each sprint (percent drop from peak to end power output) was also higher in the 50%Fopt compared with the Fopt [32 (2.5) vs. 10 (1.6) %, P < 0.01]. Peak and mean pedal rate in Fopt condition were close to the optimum (Vopt), while a large part of the sprint time in 50%Fopt was spent far from Vopt. The present study shows that sprinting against Fopt reduces fatigue within and between repeated short sprints in children. It is suggested that fatigue during repeated sprints is modified when pedal rate is not close to Vopt, according to the parabolic power versus pedal rate relationship.

  • 5.
    Giannopoulos, Antonios
    et al.
    Department of Orthopedic Surgery, University of Copenhagen.
    Yeung, Ching-Yan Chloé
    Department of Orthopedic Surgery, University of Copenhagen.
    Theos, Apostolos
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Sports medicine.
    Quantification of Cell Generated Forces: A Tool to Assess Functionality2017In: Journal of Orthopedic Research and Therapy, ISSN 2575-8241, no 8, article id JORT-168Article in journal (Refereed)
  • 6.
    Gortsila, Eugenia
    et al.
    Faculty of Physical Education & Sports Science, University of Athens.
    Theos, Apostolos
    Faculty of Physical Education & Sports Science, University of Athens.
    Nesic, Goran
    Faculty of Sport & Physical Education, University of Belgrade.
    Maridaki, Maria
    Faculty of Physical Education & Sports Science, University of Athens.
    Effect of Training Surface on Agility and Passing Skills of Prepubescent Female Volleyball Players2013In: Journal of Sports Medicine & Doping Studies, ISSN 2332-7839, E-ISSN 2161-0673, Vol. 3, article id 128Article in journal (Refereed)
    Abstract [en]

    The purpose of the present study was to investigate the effect of different training surfaces (hard or sand surface) on agility and passing skills of prepubescent female volleyball players. 45 prepubescent girls (age: 11.1 ± 0.5 years) participated in this study and were separated in three groups. Groups S (N=15) and I (N=15) consisted of volleyball players, while group C (N=15) consisted of girls that had no volleyball training experience. All groups participated in a 10-week (3 days/week) volleyball training program that included technical and passing skills exercises. The program of groups S and I also included jumping and sprinting exercises. The training program of group S was conducted on sand surface, while groups I and C trained on hard surface. Measurements of agility (T-test and 505-test) and passing skills were conducted on both hard and sand surface before, in the middle (5th week) and after the end of the training program for groups S and I. Group C was tested only on hard surface before and after the training period. Data were analyzed using two-way ANOVA for independent samples. Agility T-test and 505-test were significantly (p<0.001) improved in all three groups after the 10-week training program. Agility improvement of group S was significantly (p<0.001) greater than the other two groups (I and C), regardless of the surface (hard or sand) that the test was executed. Group S achieved greater improvements than the other two groups in passing skills too. All three groups were significantly (p<0.001) improved in overhead and forearm passing accuracy after the 10-week training period, but it was group S that achieved the greatest improvement, regardless of the (hard or sand) that the test was executed. In conclusion training on sand surface could be a useful and effective tool for improving agility and passing skills in prepubescent female volleyball players

  • 7.
    Krooks, Daniela
    et al.
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Sports medicine.
    Johansson, Malin
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Sports medicine.
    Theos, Apostolos
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Sports medicine.
    Cancer cachexia and the effects of physical activity2016In: Gavin Journal of Orthopedic Research and Therapy, ISSN 2575-8241, no 3, article id J125Article in journal (Refereed)
    Abstract [en]

    Physical activity is, among other things, characterized by an increased quality of life and several physiological positive results such as hypertrophy and counteracting atrophy. Cachexia has been proven to degradate muscle proteins and seems to be a death contributing factor during cancer.Cachectic muscles are resistant to anabolic effects, and this knowledge combined with the many proven positive outcomes on muscle hypertrophy by exercise led this study to investigate the previous studies conducted on this subject further. The Ubiquitin-Proteasome System (UPS) plays a significant role in protein degradation, more specifically the E3 ubiquitin ligases MuRF-1 (Muscle RING Finger protein-1) and MaFbx (Muscle atrophy F-box), which are FoxO (forkhead box-O) transcription factors. The UPS can be inhibited by substrates upregulated by physical activity, such as IGF-1 (Insulin-like Growth Factor-1) and PGC-1α (Peroxisome proliferator-activated receptor gamma coactivator 1-alpha). In conclusion, there are a lot of pathways in both cancer cachexia and physical activity that border on each other, but the molecular mechanisms are complex and not always clear.

  • 8.
    Nilsson, Robert
    et al.
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Sports Medicine.
    Lindberg, Ann-Sofie
    Theos, Apostolos
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Sports Medicine.
    Ferguson, Richard A.
    School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, United Kingdom.
    Malm, Christer
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Sports Medicine.
    Aerobic Variables for Prediction of Alpine Skiing Performance: A Novel Approach2018In: Sports Medicine International Open, ISSN 2367-1890, Vol. 2, no 4, p. E105-E112Article in journal (Refereed)
    Abstract [en]

    The aim of this study was to investigate the predictive power of aerobic test results and anthropometric variables on FIS-ranking of junior elite alpine skiers. Results from twenty-three male and female adolescent elite alpine skiers from two seasons were included in the multivariate statistical models. Physical work capacity was determined by V̇O2peak, blood lactate concentration ([HLa]b), and heart rate (HR) during ergometer cycling. Anthropometric variables were body stature, body weight and calculated BMI. No significant correlation between competitive performance and aerobic work capacity or anthropometric data was observed neither in male nor female adolescent skiers. Pre-season physical tests and anthropometric data could therefore not predict end-season FIS-ranking. The best regression (R2) and prediction (Q2) models of FIS slalom (SL) and giant slalom (GS) rank reached R2=0.51 to 0.86, Q2=−0.73 to 0.18, indicating no valid models. This study could not establish V̇O2peak and other included variables as predictors of competitive performance. When combining results from commonly used tests for alpine skiers, and applying multivariate statistical models, investigated tests seems of limited used for athletes, coaches, and ski federations. Performance-specific pre-season tests must be developed and validated for prediction of performance and guidance of exercise training.

  • 9.
    Nilsson, Robert
    et al.
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Section of Sports Medicine.
    Theos, Apostolos
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Section of Sports Medicine.
    Lindberg, Ann-Sofie
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Section of Sports Medicine. Winternet, Boden, Sweden.
    Ferguson, Richard A.
    School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, United Kingdom.
    Malm, Christer B.
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Section of Sports Medicine.
    Individual Profiling for Prediction of Competitive Performance in Alpine SkiingManuscript (preprint) (Other academic)
  • 10.
    Nilsson, Robert
    et al.
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Section of Sports Medicine.
    Theos, Apostolos
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Section of Sports Medicine.
    Lindberg, Ann-Sofie
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Section of Sports Medicine. Winternet, Boden, Sweden.
    Ferguson, Richard A.
    School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, United Kingdom.
    Malm, Christer B.
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Section of Sports Medicine.
    Lack of Predictive Power in Commonly Used Tests for Performance in Alpine SkiingManuscript (preprint) (Other academic)
  • 11.
    Philippou, Anastassios
    et al.
    Department of Experimental Physiology, Medical School, University of Athens.
    Armakolas, Athanasios
    Department of Experimental Physiology, Medical School, University of Athens.
    Panteleakou, Zacharoula
    Department of Experimental Physiology, Medical School, University of Athens.
    Pissimissis, Nikos
    Nezos, Adrianos
    Department of Experimental Physiology, Medical School, University of Athens.
    Theos, Apostolos
    Department of Experimental Physiology, Medical School, University of Athens.
    Kaparelou, Maria
    Department of Experimental Physiology, Medical School, University of Athens.
    Armakolas, Nikos
    Department of Experimental Physiology, Medical School, University of Athens.
    Pneumatikos, Spyridon G.
    Department of Orthopaedics, Medical School, University of Athens.
    Koutsilieris, Michael
    Department of Experimental Physiology, Medical School, University of Athens.
    IGF1Ec Expression in MG-63 Human Osteoblast-like Osteosarcoma Cells2011In: Anticancer Research, ISSN 0250-7005, E-ISSN 1791-7530, Vol. 31, no 12, p. 4259-4265Article in journal (Refereed)
    Abstract [en]

    AIM: The insulin-like growth factor 1 (IGF1) gene gives rise to multiple transcripts, using an elaborate alternative splicing mechanism. The aim of this study was to shed light on the expression and role of the IGF1 system in human MG-63 osteoblast-like osteosarcoma cells.

    MATERIALS AND METHODS: The expression of the IGF1Ea, IGF1Eb and IGF1Ec isoforms was characterized using reverse transcription polymerase chain reaction (RT-PCR), quantitative real time-PCR (qRT-PCR) and western blot analysis. Using trypan blue exclusion assays, we also examined the mitogenic effects of IGF1 and of a synthetic peptide related to the E domain of IGF1Ec (synthetic E peptide) on MG-63 cells, as well as on MG-63 cells which had been molecularly modified to restrain the expression of type I IGF receptor (IGF1R) and of insulin receptor (INSR) by siRNA techniques (IGF1R KO or INSR KO MG-63 cells).

    RESULTS: MG-63 cells express only the IGF1Ea and IGF1Ec transcripts. Exogenous administration of dihydrotestosterone (DHT) significantly increased the expression of IGF1Ea and IGF1Ec mRNA and it induced the previously undetectable expression of IGF1Eb transcript. Exogenous administration of IGF1, insulin and the synthetic E peptide stimulated the growth of MG-63 cells, while only E peptide stimulated the growth of IGF1R KO and INSR KO MG-63 cells.

    CONCLUSION: These data suggest that the expression of all IGF1 isoforms is hormonally regulated in MG-63 cells and that the expression of IGF1Ec may be involved in osteosarcoma biology by generating the Ec peptide which acts via an IGF1R-independent and INSR-independent mechanism.

  • 12.
    Philippou, Anastassios
    et al.
    Department of Experimental Physiology, Medical School, University of Athens.
    Maridaki, Maria
    Faculty of Physical Education & Sports Science, University of Athens.
    Theos, Apostolos
    Department of Experimental Physiology, Medical School, University of Athens.
    Koutsilieris, Michael
    Department of Experimental Physiology, Medical School, University of Athens.
    Cytokines in muscle damage2012In: Advances in Clinical Chemistry, ISSN 0065-2423, E-ISSN 2162-9471, Vol. 58, p. 49-87Article in journal (Refereed)
    Abstract [en]

    Multiple cellular and molecular processes are rapidly activated following skeletal muscle damage to restore normal muscle structure and function. These processes typically involve an inflammatory response and potentially the consequent occurrence of secondary damage before their resolution and the completion of muscle repair or regeneration. The overall outcome of the inflammatory process is potentially divergent, with the induction of prolonged inflammation and further muscle damage, or its active termination and the promotion of muscle repair and regeneration. The final, detrimental, or beneficial effect of the inflammatory response on muscle repair is influenced by specific interactions between inflammatory and muscle cell-derived cytokines that act as positive and/or negative regulators to coordinate local and systemic inflammatory-related events and modulate muscle repair process. A crucial balance between proinflammatory and anti-inflammatory cytokines appears to attenuate an excessive inflammatory reaction, prevent the development of muscle fibrosis, and adequately promote the regenerative process. In this review, we address the interactive cytokine responses following muscle damage, in the context of induction and progression, or resolution of muscle inflammation and the promotion of muscle repair.

  • 13.
    Theos, Apostolos
    et al.
    Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Sports medicine. Idrottshögskolan.
    Gortsila, Eugenia
    Faculty of Physical Education and Sport Science, University of Athens.
    Maridaki, Maria
    Faculty of Physical Education and Sport Science, University of Athens.
    Effects of Training Surface on Physiological Characteristics of Prepubescent Female Volleyball Players2017In: International Journal of Pediatric Health Care & Advancements, ISSN 2572-7354, Vol. 4, no 5, p. 48-53Article in journal (Refereed)
    Abstract [en]

    Purpose: The present study investigated the effects of different training surfaces on physiological characteristics of prepubescent female volleyball players.

    Method: 45 prepubescent girls (age: 11.1 ± 0.5 years) were separated in groups S (N=15) and H (N=15) that consisted of volleyball players, while group C (N=15) consisted of girls that had no volleyball training experience. Groups S and H participated in a 10-week volleyball training program including sprints, jumps and technical exercises, while group C executed only technical skills exercises. Group S trained on sand surface, while groups H and C trained on hard surface indoors. Aerobic capacity (20m shuttle run), agility (Illinois test), countermovement (CMJ) and squat jump (SJ) as well as 10m sprint test were conducted before, in the middle (5th week) and after the end of the training program for groups S and H. Group C was tested only before and after the training period.

    Results: Aerobic capacity, agility, jumping and sprinting ability were significantly (p<0.01) improved in groups S and H even from the 5th week of training. Group S achieved greater improvements than group H in all tested variables.

    Conclusion: Training on sand surface seems to promote training adaptations improving the physiological characteristics of prepubescent female volleyball players.

1 - 13 of 13
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