• Bradykinin receptor gene variant and human physical performance.

      Williams, Alun G.; Dhamrait, Sukhbir S.; Wootton, Peter T. E.; Day, Stephen H.; Hawe, Emma; Payne, John R.; Myerson, Saul G.; World, Michael; Budgett, Richard; Humphries, Steve E.; et al. (The American Physiological Society/HighWire Press, 2004)
      Accumulating evidence suggests that athletic performance is strongly influenced by genetic variation. One such locus of influence is the gene for angiotensin-I converting enzyme (ACE), which exhibits a common variant [ACE insertion (I)/deletion (D)]. ACE can drive formation of vasoconstrictor ANG II but preferentially degrades vasodilator bradykinin. The ACE I allele is associated with higher kinin activity. A common gene variant in the kinin beta(2) receptor (B(2)R) exists: the -9 as opposed to +9 allele is associated with higher receptor mRNA expression. We tested whether this variant was associated with the efficiency of muscular contraction [delta efficiency (DE)] in 115 healthy men and women, or with running distance among 81 Olympic standard track athletes. We further sought evidence of biological interaction with ACE I/D genotype. DE was highly significantly associated with B(2)R genotype (23.84 +/- 2.41 vs. 24.25 +/- 2.81 vs. 26.05 +/- 2.26% for those of +9/+9 vs. +9/-9 vs. -9/-9 genotype; n = 25, 61, and 29, respectively; P = 0.0008 for ANOVA adjusted for sex). There was evidence for interaction with ACE I/D genotype, with individuals who were ACE II, with B(2)R -9/-9 having the highest DE at baseline. The ACE I/B(2)R -9 "high kinin receptor activity" haplotype was significantly associated with endurance (predominantly aerobic) event among elite athletes (P = 0.003). These data suggest that common genetic variation in the B(2)R is associated with efficiency of skeletal muscle contraction and with distance event of elite track athletes and that at least part of the associations of ACE and fitness phenotypes is through elevation of kinin activity.
    • Effect of seasonal programming on fetal development and longevity: links with environmental temperature.

      Flouris, Andreas D; Spiropoulos, Yiannis; Sakellariou, Giorgos J.; Koutedakis, Yiannis (Wiley, 2009)
      This study examined the effect of birth season on fetal development and longevity using two independent databases of all Greek citizens that were born (total: 516,874) or died (total: 554,101) between 1999 and 2003. We found significantly increased birth weight, gestational age, and longevity in individuals born during the autumn and winter seasons of the year. These individuals also demonstrated statistically significantly lower prevalence rates for fetal growth restriction and premature birth. Furthermore, we found that increased temperature at birth was associated with adverse effects on fetal development and longevity. In conclusion, our results show strong effects of season of birth on fetal development and longevity mediated, at least in part, by environmental temperature at time of birth.
    • Instruments to assess secondhand smoke exposure in large cohorts of never smokers: The smoke scales

      Misailidi, M; Tzatzarakis, MN; Kavvalakis, MP; Koutedakis, Y; Tsatsakis, AM; Flouris, AD; FAME Laboratory, Centre for Research and Technology Hellas, Trikala, Greece ; Department of Exercise Sciences, University of Thessaly, Trikala, Greece ; Regional Directorate of Primary and Secondary Education of Western Greece, Patras, Greece. (Public Library of Science (PLoS), 2014-01-21)
      The objectives of this study were to: (i) to develop questionnaires that can identify never-smoking children and adults experiencing increased exposure to secondhand smoke (SHS+), (ii) to determine their validity against hair nicotine, and (iii) assess their reliability. A sample of 191 children (85 males; 106 females; 7-18 years) and 95 adult (23 males; 72 females; 18- 62 years) never-smokers consented to hair nicotine analysis and answered a large number of questions assessing all sources of SHS. A randomly-selected 30% answered the questions again after 20-30 days. Prevalence of SHS+ in children and adults was 0.52±0.07 and 0.67±0.10, respectively (p<0.05). The Smoke Scale for Children (SS-C) and the Smoke Scale for Adults (SS-A) were developed via factor analysis and included nine questions each. Positivity criteria for SS-C and SS-A via receiver operating characteristics curve analysis were identified at >16.5 and >16, respectively. Significant Kappa agreement (p<0.05) was confirmed when comparing the SS-C and SS-A to hair nicotine concentration. Reliability analyses demonstrated that the SS-C and SS-A scores obtained on two different days are highly correlated (p<0.001) and not significantly different (p>0.05). Area under the curve and McNemar's Chi-square showed no pair-wise differences in sensitivity and specificity at the cutoff point between the two different days for SS-C and SS-A (p>0.05). We conclude that the SS-C and the SS-A represent valid, reliable, practical, and inexpensive instruments to identify children and adult never-smokers exposed to increased SHS. Future research should aim to further increase the validity of the two questionnaires. © 2014 Misailidi et al.
    • Preserved quality of life in octogenarians at early, mid, and late follow-up intervals irrespective of cardiac procedure.

      Luckraz, Heyman; Nagarajan, Kumaresan; Chnaris, Akis; Jayia, Parminderjit Kaur; Muhammed, Israr; Mahboob, Sophia; Nevill, Alan M. (Elsevier, 2016-02-06)
      Cardiac surgery has become established in octogenarians over the past decade. This study assessed the quality of life (QOL) and survival in patients undergoing various cardiac procedures at various time intervals postoperative. Patients older than 80 years at the time of their cardiac procedure were initially included (n = 427). Patients were grouped according to the time interval from their operations namely as within 3 years postoperative (Group A), 3-5 years postoperative (Group B), and older than 5 years postoperative (Group C). Patients who were at least 2 years postoperative and who were still alive were sent the Medical Outcomes Study Short Form 12 Health Survey version 2 QOL questionnaire (n = 308). In results, there were no significant differences in the preoperative characteristics among the groups including type of surgery and logistic Euroscore. There were also no significant differences in the immediate postoperative phase in the complication rates except for renal replacement therapy (P < 0.01). At follow-up, a further 20 patients had died, and for those still alive 87% (61 of 70), 86% (86 of 100), and 74% (87 of 118) of patients returned questionnaire for each group, respectively. There were no significant differences in mental scores (P = 0.3) and physical scores (P = 0.07) among the groups at the various time intervals. This was irrespective of the type of surgery performed on multivariate analysis. Moreover, most octogenarians who underwent cardiac surgery had equivalent or better QOL than expected when compared with the general population of the same age and sex. In conclusion, the QOL in octogenarians undergoing cardiac surgery is preserved, irrespective of the interval from and the type of procedure. Octogenarians enjoy a good QOL, both physical and mental performance, irrespective of the time interval after surgery and the type of cardiac surgery that they have undergone. Based on these data, any type of cardiac surgery should still be an option in this age group including complex cardiac procedures.