Effects of Dehydration during Cycling on Skeletal Muscle Metabolism in Females

Logan-Sprenger, Heather M.; Heigenhauser, George J. F.; Killian, Kieran J.; Spriet, Lawrence L.

doi:10.1249/mss.0b013e31825abc7c

Cited by 59 publications

(75 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Only 2 players in the CES trial had a peak Tc greater than 39°C, compared with 8 players in NF. The 0.3°C difference in Tc is lower than the 0.5-0.6°C difference measured in studies of 2% dehydration during steady-state exercise in the laboratory (Logan-Sprenger et al 2012, 2013Baker et al 2007), but similar to the 0.4°C difference measured during a self-paced soccer game (Edwards et al 2007). During the same period that Tc was reaching its peak in the present study, players in the CES trial had increased skating speed and time at high effort.…”

Section: Discussionsupporting

confidence: 46%

“…Sweat rates in CES and NF were similar, while Tc was lower in CES, suggesting that there was increased heat transfer from the core of the body to the periphery in CES. Logan-Sprenger et al (2012, 2013 reported lower Tc in both men and women while cycling in a temperate environment while staying hydrated with water versus progressive mild dehydration, even though sweat rates were identical. During exercise, the cardiovascular system must provide adequate blood flow to the contracting muscles to maintain the exercise intensity and to the skin for adequate heat dissipation.…”

Section: Discussionmentioning

confidence: 93%

“…The between-trial difference in postgame skating speed was significantly correlated with the difference in peak Tc during the scrimmage. Several studies have reported increased muscle glycogen use with dehydration of 1%-2% BM, which was associated with increased muscle temperature and Tc (Hargreaves et al 1996;Logan-Sprenger et al 2012). A previous study of soccer players demonstrated increased Tc during a soccer game, followed by decreased postgame sprinting ability (Edwards et al 2007).…”

Section: Discussionmentioning

confidence: 95%

See 2 more Smart Citations

Maintaining hydration with a carbohydrate–electrolyte solution improves performance, thermoregulation, and fatigue during an ice hockey scrimmage

Linseman

Palmer

Sprenger

et al. 2014

Appl. Physiol. Nutr. Metab.

Self Cite

View full text Add to dashboard Cite

Research in "stop-and-go" sports has demonstrated that carbohydrate ingestion improves performance and fatigue, and that dehydration of ∼1.5%-2% body mass (BM) loss results in decreased performance, increased fatigue, and increased core temperature. The purpose of this investigation was to assess the physiological, performance, and fatigue-related effects of maintaining hydration with a carbohydrate-electrolyte solution (CES) versus dehydrating by ∼2% BM (no fluid; NF) during a 70-min ice hockey scrimmage. Skilled male hockey players (n = 14; age, 21.3 ± 0.2 years; BM, 80.1 ± 2.5 kg; height, 182.0 ± 1.2 cm) volunteered for the study. Subjects lost 1.94% ± 0.1% BM in NF, and 0.12% ± 0.1% BM in CES. Core temperature (Tc) throughout the scrimmage (10-50 min) and peak Tc (CES: 38.69 ± 0.10 vs. NF: 38.92 ± 0.11 °C; p < 0.05) were significantly reduced in CES compared with NF. Players in CES had increased mean skating speed and time at high effort between 30-50 min of the scrimmage. They also committed fewer puck turnovers and completed a higher percentage of passes in the last 20 min of play compared with NF. Postscrimmage shuttle skating performance was improved in CES versus NF and fatigue was lower following the CES trial. The results indicated that ingesting a CES to maintain BM throughout a 70-min hockey scrimmage resulted in improved hockey performance and thermoregulation, and decreased fatigue as compared with drinking no fluid and dehydrating by ∼2%.

show abstract

Section: Discussionsupporting

confidence: 46%

Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 95%

See 1 more Smart Citation

Maintaining hydration with a carbohydrate–electrolyte solution improves performance, thermoregulation, and fatigue during an ice hockey scrimmage

Linseman

Palmer

Sprenger

et al. 2014

Appl. Physiol. Nutr. Metab.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, water losses ≥ 2% of total body weight impair significantly exercise and skill performance (1, 5) both in laboratories and field studies as well as mental performance in hot environments (7, 27, 28). Moreover, recent studies indicated that even lower levels of dehydration (~ −1%) provoke unfavorable changes in the athletic performance (6, 18). …”

Section: Introductionmentioning

confidence: 99%

Fluid Balance During Training in Elite Young Athletes of Different Sports

Arnaoutis

Kavouras

Angelopoulou

et al. 2015

Journal of Strength and Conditioning Research

View full text Add to dashboard Cite

Although there are many studies demonstrating a high percentage of adult athletes which start exercise in sub-optimal hydration state, limited data concerning hydration levels in athletic youth exists. The purpose of this study was to identify the hydration status of elite young athletes of different sports, during a typical day of training. Fifty-nine young elite men athletes from different sports (basketball, gymnastics, swimming, running, canoeing) participated in the study (age: 15.2±1.3 y, years of training: 7.7±2.0). Hydration status was assessed in the morning, before and immediately after practice. Data collection took place at the same time of the day, with mean environmental temperature and humidity at the time of the measurements at 27.6±0.9 °C and 58±8%, respectively. All athletes trained for approximately 90 min and they were consuming fluids ad libitum throughout their practice. Over 89% of the athletes were hypohydrated (USG≥1.020 mg/dl) based on their first morning urine sample. Pre-training urine samples revealed that 76.3% of the athletes were hypohydrated, while a significant high percent remained hypohydrated even after training according to USG values ≥ 1.020 mg/dl (74.5%) and urine color scale: 5-6 (76.3%). Mean body weight loss during training was −1.1±0.07%. We concluded that the prevalence of hypohydration among elite young athletes is very high, as indicated by the USG and urine color values. The majority of the athletes was hypohydrated throughout the day and dehydrated even more during practice despite fluid availability.

show abstract

“…The reality in sport is that the majority of athletes only replace ∼50% of sweat losses during exercise leading to significant fluid deficits, and as a result experiences amplified physiological responses compared to when drinking enough fluid to replace sweat losses (Burke 1997; Krause and Rodrigues-Krause 2011; Logan-Sprenger et al. 2013a, 2013b). …”

Section: Introductionmentioning

confidence: 99%

The effect of dehydration on muscle metabolism and time trial performance during prolonged cycling in males

Logan-Sprenger¹,

Heigenhauser

Jones

et al. 2015

Physiol Rep

Self Cite

View full text Add to dashboard Cite

This study combined overnight fluid restriction with lack of fluid intake during prolonged cycling to determine the effects of dehydration on substrate oxidation, skeletal muscle metabolism, heat shock protein 72 (Hsp72) response, and time trial (TT) performance. Nine males cycled at ∼65% VO2peak for 90 min followed by a TT (6 kJ/kg BM) either with fluid (HYD) or without fluid (DEH). Blood samples were taken every 20 min and muscle biopsies were taken at 0, 45, and 90 min of exercise and after the TT. DEH subjects started the trial with a −0.6% BM from overnight fluid restriction and were dehydrated by 1.4% after 45 min, 2.3% after 90 min of exercise, and 3.1% BM after the TT. There were no significant differences in oxygen uptake, carbon dioxide production, or total sweat loss between the trials. However, physiological parameters (heart rate [HR], rate of perceived exertion, core temperature [Tc], plasma osmolality [Posm], plasma volume [Pvol] loss, and Hsp72), and carbohydrate (CHO) oxidation and muscle glycogen use were greater during 90 min of moderate cycling when subjects progressed from 0.6% to 2.3% dehydration. TT performance was 13% slower when subjects began 2.3% and ended 3.1% dehydrated. Throughout the TT, Tc, Posm, blood and muscle lactate [La], and serum Hsp72 were higher, even while working at a lower power output (PO). The accelerated muscle glycogen use during 90 min of moderate intensity exercise with DEH did not affect subsequent TT performance, rather augmented Tc, RPE and the additional physiological factors were more important in slowing performance when dehydrated.

show abstract

Effects of Dehydration during Cycling on Skeletal Muscle Metabolism in Females

Cited by 59 publications

References 33 publications

Maintaining hydration with a carbohydrate–electrolyte solution improves performance, thermoregulation, and fatigue during an ice hockey scrimmage

Maintaining hydration with a carbohydrate–electrolyte solution improves performance, thermoregulation, and fatigue during an ice hockey scrimmage

Fluid Balance During Training in Elite Young Athletes of Different Sports

The effect of dehydration on muscle metabolism and time trial performance during prolonged cycling in males

Contact Info

Product

Resources

About