PMID- 28912725
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20201001
IS  - 1664-042X (Print)
IS  - 1664-042X (Electronic)
IS  - 1664-042X (Linking)
VI  - 8
DP  - 2017
TI  - Enhanced Strength and Sprint Levels, and Changes in Blood Parameters during a 
      Complete Athletics Season in 800 m High-Level Athletes.
PG  - 637
LID - 10.3389/fphys.2017.00637 [doi]
LID - 637
AB  - The purpose of this study was to analyze changes in sprint, strength, 
      hematological, and hormonal parameters in high-level 800 m athletes during a 
      complete athletics season. Thirteen male athletes of national and international 
      level in 800 m (personal best ranging from 1:43 to 1:58 min:ss) participated in 
      this study. A total of 5 tests were conducted during a complete athletics season. 
      Athletes performed sprint tests (20 and 200 m), countermovement jump (CMJ), jump 
      squat (JS), and full squat (SQ) tests. Blood samples (red and white blood 
      profile) and hormones were collected in test 1 (T1), test 3 (T3), and test 5 
      (T5). A general increase in the performance of the strength and sprint parameters 
      analyzed (CMJ, JS, SQ, 20 m, and 200 m) during the season was observed, with a 
      significant time effect in CMJ (P < 0.01), SQ (P < 0.01), and 200 m (P < 0.05). 
      This improvement was accompanied by a significant enhancement of the 800 m 
      performance from T3 to T5 (P < 0.01). Significant changes in some hematological 
      variables: hematocrit (Hct) (P < 0.01), mean corpuscular volume (MCV) (P < 
      0.001), mean corpuscular hemoglobin content (MCHC) (P < 0.001), white blood cells 
      count (WBC) (P < 0.05), neutrophils (P < 0.05), monocytes (P < 0.05), and mean 
      platelet volume (MPV) (P < 0.05) were observed throughout the season. The 
      hormonal response and creatin kinase (CK) did not show significant variations 
      during the season, except for insulin-like growth factor I (IGF-1) (P < 0.05). In 
      conclusion, our results suggest the importance of strength levels in 
      middle-distance athletes. On the other hand, variations in some hematological 
      parameters and a depression of the immune system occurred during the season. 
      Therefore, monitoring of the mechanical, hematological and hormonal response in 
      athletes may help coaches and athletes to optimize the regulation of training 
      contents and may be useful to diagnose states of overreaching or overtraining in 
      athletes throughout the season.
FAU - Bachero-Mena, Beatriz
AU  - Bachero-Mena B
AD  - Faculty of Sport, Pablo de Olavide UniversitySevilla, Spain.
AD  - Physical and Athletic Performance Research Centre, Pablo de Olavide 
      UniversitySevilla, Spain.
FAU - Pareja-Blanco, Fernando
AU  - Pareja-Blanco F
AD  - Faculty of Sport, Pablo de Olavide UniversitySevilla, Spain.
AD  - Physical and Athletic Performance Research Centre, Pablo de Olavide 
      UniversitySevilla, Spain.
FAU - Gonzalez-Badillo, Juan J
AU  - Gonzalez-Badillo JJ
AD  - Physical and Athletic Performance Research Centre, Pablo de Olavide 
      UniversitySevilla, Spain.
LA  - eng
PT  - Journal Article
DEP - 20170831
PL  - Switzerland
TA  - Front Physiol
JT  - Frontiers in physiology
JID - 101549006
PMC - PMC5583192
OTO - NOTNLM
OT  - IGF-1
OT  - competition
OT  - countermovement jump
OT  - hematocrit
OT  - middle-distance
OT  - resistance-training
EDAT- 2017/09/16 06:00
MHDA- 2017/09/16 06:01
PMCR- 2017/08/31
CRDT- 2017/09/16 06:00
PHST- 2016/09/30 00:00 [received]
PHST- 2017/08/14 00:00 [accepted]
PHST- 2017/09/16 06:00 [entrez]
PHST- 2017/09/16 06:00 [pubmed]
PHST- 2017/09/16 06:01 [medline]
PHST- 2017/08/31 00:00 [pmc-release]
AID - 10.3389/fphys.2017.00637 [doi]
PST - epublish
SO  - Front Physiol. 2017 Aug 31;8:637. doi: 10.3389/fphys.2017.00637. eCollection 
      2017.