The Influence of Hydration on Anaerobic Performance

Kraft, Justin A.; Green, James M.; Bishop, Phillip A.; Richardson, Mark T.; Neggers, Yasmin H.; Leeper, James D.

doi:10.1080/02701367.2012.10599859

Cited by 19 publications

(13 citation statements)

References 44 publications

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“…While studies have indicated that dehydration may ( Minshull and James, 2012 ; Rodrigues et al, 2014 ) or may not ( Cheuvront et al, 2006 ; Kraft et al, 2012 ) compromise anaerobic performance, few studies have examined measures of central and peripheral neuromuscular function and performance following rehydration. In the present study we observed no differences in maximal strength between conditions at any timepoint (Tables 2 , 3 ).…”

Section: Discussionmentioning

confidence: 99%

“…As such, the balance of total body water has been the topic of much previous research, with inducing a deficit in total body water (dehydration) and the effects on exercise performance being a large focus ( Horswill and Janas, 2011 ; Cheuvront and Kenefick, 2014 ). Dehydration of 2–3% of body mass (BM) has been found to impair both aerobic exercise performance, especially when convective cooling is minimal ( Barr, 1999 ; Cheuvront et al, 2010 ), and anaerobic performance ( Kraft et al, 2012 ). The research is less clear when examining ultra-endurance performance with studies finding increased dehydration to be associated with improved performance ( Zouhal et al, 2010 ; Knechtle et al, 2012 ).…”

Section: Introductionmentioning

confidence: 99%

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Acute Dehydration Impairs Endurance Without Modulating Neuromuscular Function

et al. 2018

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Introduction/Purpose: This study examined the influence of acute dehydration on neuromuscular function.Methods: On separate days, combat sports athletes experienced in acute dehydration practices (n = 14) completed a 3 h passive heating intervention (40°C, 63% relative humidity) to induce dehydration (DHY) or a thermoneutral euhydration control (25°C, 50% relative humidity: CON). In the ensuing 3 h ad libitum fluid and food intake was allowed, after which participants performed fatiguing exercise consisting of repeated unilateral knee extensions at 85% of their maximal voluntary isometric contraction (MVIC) torque until task failure. Both before and after the fatiguing protocol participants performed six MVICs during which measures of central and peripheral neuromuscular function were made. Urine and whole blood samples to assess urine specific gravity, urine osmolality, haematocrit and serum osmolality were collected before, immediately and 3 h after intervention.Results: Body mass was reduced by 3.2 ± 1.1% immediately after DHY (P < 0.001) but recovered by 3 h. Urine and whole blood markers indicated dehydration immediately after DHY, although blood markers were not different to CON at 3 h. Participants completed 28% fewer knee extensions at 85% MVIC (P < 0.001, g = 0.775) and reported a greater perception of fatigue (P = 0.012) 3 h after DHY than CON despite peak torque results being unaffected. No between-condition differences were observed in central or peripheral indicators of neuromuscular function at any timepoint.Conclusion: Results indicate that acute dehydration of 3.2% body mass followed by 3 h of recovery impairs muscular strength-endurance and increases fatigue perception without changes in markers of central or peripheral function. These findings suggest that altered fatigue perception underpins muscular performance decrements in recovery from acute dehydration.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acute Dehydration Impairs Endurance Without Modulating Neuromuscular Function

et al. 2018

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“…Typically during exercise in temperatures less than 25˚C, team sport athletes appear to lose between ~1% and 1.5% of pre exercise body mass (BM) (Garth and Burke 2013). This magnitude of BM loss is well within the 2% threshold often proposed to impair performance in high-intensity, intermittent sport (Judelson et al 2007), however inconsistencies surrounding this threshold are evident within the literature (Judelson et al 2007;Sawka et al 2007;Kraft et al 2012). Nevertheless, this highlights that team sport athletes in such environmental conditions either do not elicit high fluid losses and/or are capable of offsetting their fluid losses with suitable fluid intake.…”

Section: Introductionmentioning

confidence: 74%

Why do team-sport athletes drink fluid in excess when exercising in cool conditions?

Bargh

King

Gray

et al. 2017

Appl. Physiol. Nutr. Metab.

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This study assessed the potential physiological and perceptual drivers of fluid intake (FI) and thirst sensation (TS) during intermittent exercise. 10 male rugby players (17 ± 1 years, stature:179.1 ± 4.2 cm, body mass (BM): 81.9 ± 8.1 kg) participated in 6x6 min small-sided games, ∆TS and FI was observed (r = 0.085, p = 0.841). These data observed in an ambient temperature of 13.6 ± 0.9C, suggest team sport athletes drink in excess of fluid homeostasis requirements and TS in cool conditions, however this was not influence by thermal discomfort.

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“…A possible explanation for a portion of these equivocal results is the failure of some studies to achieve the level of body water loss (.3%) associated with diminished anaerobic performance (23,45). Other factors may also be influential.…”

Section: Introductionmentioning

confidence: 97%

Effects of Hypohydration on Repeated 40-yd Sprint Performance

Gann

Green

OʼNeal

et al. 2016

Journal of Strength and Conditioning Research

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This study examined the effects of hypohydration on repeated 40-yd sprint performance. Anaerobically fit current and former Division II male athletes (n = 12) completed 2 bouts of 10 × 40-yd sprints followed by an agility test, dehydrated (∼3% body weight [DT]), or hydrated trial (HT). Statistical analysis of group means indicated that hypohydration had little effect on sprint times for either the first (DT= 5.38 ± 0.37; HT = 5.35 ± 0.34) or second (DT = 5.47 ± 0.39; HT = 5.42 ± 0.39) bout of 10 sprints with only sprint number 2, 5, and 6 of bout 2 reaching statistical significance. However, when individual sprint performance was considered, a greater effect was seen. In all, 83% (10 of 12) of subjects experienced a meaningful change (≥0.1 seconds) (positive or negative) in mean sprint time (DT vs. HT) for one or more bout of 10 sprints. Ratings of perceived exertion was significantly higher (∼1 unit on a 10 point scale) for DT in all sprints during bout 1 and the first 2 sprints of bout 2. These results indicate that the effect of hypohydration on repeated sprint performance varies among individuals. Some improved performance with hypohydration, while others experienced detrimental effects. Hypohydration also resulted in a particularly notable negative impact on perceptual measures of exertion even when performance was similar.

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The Influence of Hydration on Anaerobic Performance

Cited by 19 publications

References 44 publications

Acute Dehydration Impairs Endurance Without Modulating Neuromuscular Function

Acute Dehydration Impairs Endurance Without Modulating Neuromuscular Function

Why do team-sport athletes drink fluid in excess when exercising in cool conditions?

Effects of Hypohydration on Repeated 40-yd Sprint Performance

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