Results 1 to 9 of 9
  1. #1
    Banned Rat Scum
    Join Date
    Feb 2009
    Posts
    432
    Rep Power
    0

    Default dehydration increases cortisol, decreases test response, alters carb metabolism

    Do yoursef a favor, take fluid and electrolytes in during your workout. Pretty simple stuff.


    See below:


    J Appl Physiol. 2008 Sep;105(3):816-24. Epub 2008 Jul 10.
    Effect of hydration state on resistance exercise-induced endocrine markers of anabolism, catabolism, and metabolism.

    Judelson DA, Maresh CM, Yamamoto LM, Farrell MJ, Armstrong LE, Kraemer WJ, Volek JS, Spiering BA, Casa DJ, Anderson JM.
    Dept. of Kinesiology, California State Univ., Fullerton, CA 92834, USA. [email protected]
    Hypohydration (decreased total body water) exacerbates the catabolic hormonal response to endurance exercise with unclear effects on anabolic hormones. Limited research exists that evaluates the effect of hypohydration on endocrine responses to resistance exercise; this work merits attention as the acute postexercise hormonal environment potently modulates resistance training adaptations. The purpose of this study was to examine the effect of hydration state on the endocrine and metabolic responses to resistance exercise. Seven healthy resistance-trained men (age = 23 +/- 4 yr, body mass = 87.8 +/- 6.8 kg, body fat = 11.5 +/- 5.2%) completed three identical resistance exercise bouts in different hydration states: euhydrated (EU), hypohydrated by approximately 2.5% body mass (HY25), and hypohydrated by approximately 5.0% body mass (HY50). Investigators manipulated hydration status via controlled water deprivation and exercise-heat stress. Cortisol, epinephrine, norepinephrine, testosterone, growth hormone, insulin-like growth factor-I, insulin, glucose, lactate, glycerol, and free fatty acids were measured during euhydrated rest, immediately preceding resistance exercise, immediately postexercise, and during 60 min of recovery. Body mass decreased 0.2 +/- 0.4, 2.4 +/- 0.4, and 4.8 +/- 0.4% during EU, HY25, and HY50, respectively, supported by humoral and urinary changes that clearly indicated subjects achieved three distinct hydration states. Hypohydration significantly 1) increased circulating concentrations of cortisol and norepinephrine, 2) attenuated the testosterone response to exercise, and 3) altered carbohydrate and lipid metabolism. These results suggest that hypohydration can modify the hormonal and metabolic response to resistance exercise, influencing the postexercise circulatory milieu.

    PMID: 18617629 [PubMed - indexed for MEDLINE]

  2. #2
    NOVICE
    Join Date
    Oct 2009
    Location
    Wienna, Austria
    Posts
    30
    Rep Power
    0

    Default

    hat does that mean in practice?

  3. #3
    Banned Rat Scum
    Join Date
    Feb 2009
    Posts
    432
    Rep Power
    0

    Default

    Quote Originally Posted by FlexMasterSexy View Post
    hat does that mean in practice?

    it means you should stay well-hydrated while you're working out. If you're losing several pounds of water, you will blunt your recovery and muscle gains, as cort levels stay high and test levels stay low.

  4. #4
    RX MEMBER Ryan Wacht's Avatar
    Join Date
    Aug 2009
    Location
    Michigan
    Posts
    1,201
    Rep Power
    84694

    Default

    Quote Originally Posted by Dr Pangloss View Post
    it means you should stay well-hydrated while you're working out. If you're losing several pounds of water, you will blunt your recovery and muscle gains, as cort levels stay high and test levels stay low.
    This is so true, I've noticed that my progress completely comes to a halt when I don't drink enough fluids, even if on cycle.

  5. #5
    RX MEMBER nitrous's Avatar
    Join Date
    Aug 2009
    Location
    Abby, BC
    Posts
    1,174
    Rep Power
    15254

    Default

    very cool thanks for posting that

  6. #6
    NOVICE
    Join Date
    Feb 2009
    Posts
    39
    Rep Power
    0

    Default

    Physical stress is a stimulus for the release of cortisol which is a trigger for gluconeogenesis. I guess since gluconeogenesis causes cells to use other forms of energy besides glucose, the result is impaired carbohydrate metabolism.

    Dr. P, I remember hearing Scott Connelly say that gluconeogenesis occurs at 80% rate. What other mechanisms cause gluconeogenesis and at what rate does it occur during rest and physical activity.

    I'm trying to find out more about gluconeogenesis, since Dr. Connelly is an advocate of a low carb diet and says the body can effectively use other molecules besides glucose for energy metabolism.

  7. #7
    BARBARIAN BROTHER juggernaut's Avatar
    Join Date
    May 2009
    Location
    NJ
    Posts
    932
    Rep Power
    21698

    Default

    Interesting stuff. I do question and I get this question a lot from my clients, how much is needed during the day and does it require replenishment after the workout. Does the standard of half your weight in ounces apply?

  8. #8
    Banned Rat Scum
    Join Date
    Feb 2009
    Posts
    432
    Rep Power
    0

    Default

    Quote Originally Posted by juggernaut View Post
    Interesting stuff. I do question and I get this question a lot from my clients, how much is needed during the day and does it require replenishment after the workout. Does the standard of half your weight in ounces apply?

    Have them get on the scale before and after the workout. If they're losing more than a pound afterward, they should hydrate more.

  9. #9
    BARBARIAN BROTHER juggernaut's Avatar
    Join Date
    May 2009
    Location
    NJ
    Posts
    932
    Rep Power
    21698

    Default

    Thanks doc. Now what about during the day? What's a good ratio to go by? Like I said, I always told people to get in at least half your body weight in ounces. Is that acceptable?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

X vBulletin 4.2.3 Debug Information

  • Page Generation 0.13105 seconds
  • Memory Usage 7,071KB
  • Queries Executed 25 (?)
More Information
Template Usage (40):
  • (1)SHOWTHREAD
  • (1)ad_footer_end
  • (1)ad_footer_start
  • (1)ad_global_above_footer
  • (1)ad_global_below_navbar
  • (1)ad_global_header1
  • (1)ad_global_header2
  • (1)ad_navbar_below
  • (1)ad_showthread_firstpost_sig
  • (1)ad_showthread_firstpost_start
  • (1)ad_thread_first_post_content
  • (1)ad_thread_last_post_content
  • (3)bbcode_quote
  • (4)block_html
  • (1)block_threads
  • (1)facebook_footer
  • (1)facebook_header
  • (1)facebook_likebutton
  • (1)facebook_opengraph
  • (1)footer
  • (1)forumjump
  • (1)forumrules
  • (1)gobutton
  • (1)header
  • (1)headinclude
  • (1)headinclude_bottom
  • (9)memberaction_dropdown
  • (1)navbar
  • (4)navbar_link
  • (1)navbar_noticebit
  • (1)navbar_tabs
  • (3)option
  • (9)postbit_legacy
  • (9)postbit_onlinestatus
  • (9)postbit_wrapper
  • (3)showthread_bookmarksite
  • (1)sidebarext_temp
  • (1)spacer_close
  • (1)spacer_open
  • (1)tagbit_wrapper 

Phrase Groups Available (6):
  • global
  • inlinemod
  • postbit
  • posting
  • reputationlevel
  • showthread
Included Files (37):
  • ./showthread.php
  • ./global.php
  • ./includes/class_bootstrap.php
  • ./includes/init.php
  • ./includes/class_core.php
  • ./includes/config.php
  • ./includes/functions.php
  • ./includes/functions_navigation.php
  • ./includes/class_friendly_url.php
  • ./includes/class_hook.php
  • ./includes/class_bootstrap_framework.php
  • ./vb/vb.php
  • ./vb/phrase.php
  • ./includes/class_facebook.php
  • ./includes/facebook/facebook.php
  • ./includes/facebook/base_facebook.php
  • ./includes/functions_facebook.php
  • ./includes/functions_bigthree.php
  • ./includes/class_postbit.php
  • ./includes/class_bbcode.php
  • ./includes/functions_reputation.php
  • ./includes/class_block.php
  • ./includes/block/html.php
  • ./vb/context.php
  • ./vb/cache.php
  • ./vb/cache/db.php
  • ./vb/cache/observer/db.php
  • ./vb/cache/observer.php
  • ./includes/functions_notice.php
  • ./includes/block/threads.php
  • ./packages/vbattach/attach.php
  • ./vb/types.php
  • ./packages/skimlinks/hooks/postbit_display_complete.php
  • ./packages/skimlinks/hooks/showthread_complete.php
  • ./mobiquo/smartbanner.php
  • ./mobiquo/include/classTTConnection.php
  • ./mobiquo/smartbanner/head.inc.php 

Hooks Called (74):
  • init_startup
  • database_pre_fetch_array
  • database_post_fetch_array
  • friendlyurl_resolve_class
  • global_bootstrap_init_start
  • global_bootstrap_init_complete
  • cache_permissions
  • fetch_threadinfo_query
  • fetch_threadinfo
  • fetch_foruminfo
  • load_show_variables
  • load_forum_show_variables
  • global_state_check
  • global_bootstrap_complete
  • global_start
  • style_fetch
  • global_setup_complete
  • showthread_start
  • cache_templates
  • cache_templates_process
  • template_register_var
  • template_render_output
  • fetch_template_start
  • fetch_template_complete
  • friendlyurl_clean_fragment
  • friendlyurl_geturl
  • fb_canonical_url
  • fb_opengraph_array
  • parse_templates
  • fetch_musername
  • notices_check_start
  • notices_noticebit
  • process_templates_complete
  • showthread_getinfo
  • strip_bbcode
  • forumjump
  • friendlyurl_redirect_canonical
  • showthread_post_start
  • showthread_query_postids
  • showthread_query
  • bbcode_fetch_tags
  • bbcode_create
  • showthread_postbit_create
  • postbit_factory
  • postbit_display_start
  • reputation_power
  • reputation_image
  • postbit_imicons
  • bbcode_parse_start
  • bbcode_parse_complete_precache
  • bbcode_parse_complete
  • postbit_display_complete
  • memberaction_dropdown
  • tag_fetchbit_complete
  • forumrules
  • showthread_bookmarkbit
  • navbits
  • navbits_complete
  • build_navigation_data
  • build_navigation_array
  • check_navigation_permission
  • process_navigation_links_start
  • process_navigation_links_complete
  • set_navigation_menu_element
  • build_navigation_menudata
  • build_navigation_listdata
  • build_navigation_list
  • set_navigation_tab_main
  • set_navigation_tab_fallback
  • navigation_tab_complete
  • fb_publish_checkbox
  • fb_like_button
  • showthread_complete
  • page_templates