Failure of weight training to affect urinary indices of protein metabolism in men

Hickson, James F.; Wolinsky, Ira; Rodriguez, Gladys P.; Pivarnik, James M.; Kent, Mary C.; Shier, Nathan W.

doi:10.1249/00005768-198610000-00012

Cited by 31 publications

(6 citation statements)

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“…The exercise treatment is another factor. Intensity, duration, and the type of muscle contractions vary in the previous studies (2,6,7,8,13,21,22,23,27); thus, different exercise protocols may elicit differences in the muscle protein breakdown.…”

Section: Resultsmentioning

confidence: 97%

“…These studies are supported by a muscle biopsy study on an acute bout of exercise in humans (23) and a protein kinetics study on training subjects (2) in which there was a decrease in free intramuscle 3MH and plasma 3MH efflux from the muscle, respectively. Additionally, no changes in urine 3MH have been reported as a result of running (22,27), cycling (6), or acute bouts of weight training (13). Several factors exist that could produce the different responses of urine 3MH after exercise.…”

Section: Resultsmentioning

confidence: 99%

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Excretion of 3-Methylhistidine and Hydroxyproline Following Acute Weight-Training Exercise

Horswill¹,

Layman²,

Boileau³

et al. 1988

Int J Sports Med

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Changes in urine excretion of 3-methylhistidine (3MH) and hydroxyproline (OHP) were investigated following a single session of weight training that produced delayed onset muscle soreness (DOMS). The subjects (n = 18) maintained meat-free diets for 6 days and collected 24-h urine volume on day 4 (PRE), day 5 (POST1), and day 6 (POST2) for analysis of 3MH, OHP, and creatinine (CRE). At the end of PRE, nine subjects (EX) performed intensive weight-training exercises. The remaining subjects (NE) served as a nonexercised group. All subjects were measured for fat free weight (FFW) and rated DOMS at the end of each urine collection period, i.e., PRE, POST1, and POST2. The results were significant DOMS ratings on POST1 and POST2 compared with PRE2 for EX only. Excretion of 3MH (x +/- SE in mumol/day) by group were, for EX, PRE 271 +/- 18, POST1 243 +/- 16, POST2 259 +/- 23; for NE, PRE 203 +/- 23, POST1 209 +/- 27, POST2 225 +/- 32. Excretion of OHP (x +/- SE in mg/day) were, for EX, PRE 30.0 +/- 5.4, POST1 32.8 +/- 6.4, POST2 29.6 +/- 6.1; for NE, PRE 22.5 +/- 5.2, POST1 21.6 +/- 6.0, POST2 22.7 +/- 6.0. Changes in urine 3MH and OHP were not statistically significant, whether analyzed in absolute terms or relative to CRE and FFW. It was concluded that the acute session of weight training which produced muscle soreness did not effect excretion of 3MH or OHP.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Excretion of 3-Methylhistidine and Hydroxyproline Following Acute Weight-Training Exercise

Horswill¹,

Layman²,

Boileau³

et al. 1988

Int J Sports Med

View full text Add to dashboard Cite

show abstract

“…The impact of exercise (or conversely hypokinesia) has been suggested to affect creatinine metabolism in humans although not uniformly. Studies have reported that intensive exercise reduces creatinine excretion, 23 whilst others have shown the opposite 24 or no significant effect 25 . Reports detailing the amount of regular exercise and day‐to‐day physical activity levels in PDD are sparse at present, although a high comorbidity rate with activity‐related disorders such as Attention Deficit Hyperactivity Disorder (ADHD) 26 would suggest that at least in a proportion of cases, activity levels will be high.…”

Section: Discussionmentioning

confidence: 99%

“…Studies have reported that intensive exercise reduces creatinine excretion, 23 whilst others have shown the opposite 24 or no signifi cant effect. 25 Reports detailing the amount of regular exercise and day-to-day physical activity levels in PDD are sparse at present, although a high comorbidity rate with activity-related disorders such as Attention Defi cit Hyperactivity Disorder (ADHD) 26 would suggest that at least in a proportion of cases, activity levels will be high. No measure of physical activity level was included in the current study, and hence we cannot rule out a possible effect from this variable in our sample.…”

Section: Discussionmentioning

confidence: 99%

Spot urinary creatinine excretion in pervasive developmental disorders

Whiteley¹,

Waring²,

Williams³

et al. 2006

Pediatrics International

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Further studies of protein catabolism and renal function in autism are required to ascertain the relevance of decreased spot urinary creatinine excretion identified in this preliminary study. Issues regarding the use of single urine creatinine measurements and associated confounding variables are discussed in light of the findings, together with recommendations to use other internal or external standards for the quantification of urinary compounds in PDD research.

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“…Each diet treatment was 6 days in duration separated by at least 2 weeks and the treatments were systematically rotated to avoid any order effects. The 6-day dietary periods were chosen to allow sufficient time for achieving a new equilibrium in body N balance (25,37) but without potentially creating a significant depletion of body protein on the REC-PRO diet. Urine collections (24 h) were made on days 4, 5, and 6.…”

Section: Dietary Protocolmentioning

confidence: 99%

Effect of Chronic Endurance Exercise on Retention of Dietary Protein

Friedman¹,

Lemon²

1989

Int J Sports Med

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On two separate occasions, five well-trained endurance runners (VO2max = 71 +/- 5 ml/kg/min; means +/- SD) consumed a meat-free diet for 6 days. For one trial the subjects consumed the recommended dietary allowance (RDA) of protein (REC-PRO = 0.86 +/- 0.23 g/kg body wt/day). Protein intake for the other trial was 1.7 times higher (HI-PRO = 1.49 +/- 0.29 g/kg body wt/day). Each subject followed his regular training program (12-16 km running/day), and on day 5 of each diet completed a treadmill run at a similar intensity and duration (75 min at 72% VO2max). Seventy-two hour urinary urea N loss (days 4, 5, and 6 of each diet) and day 5 exercise sweat urea N excretion were measured. Serum urea N and creatinine increased significantly during the treadmill run under both dietary conditions (P less than 0.05). No significances between diet differences were observed in sweat or urinary urea N excretion; however, excretion of both tended to be higher on the REC-PRO diet than on the HI-PRO diet. The differences in protein intake combined with the nitrogen excretion measures resulted in significant differences in estimated whole-body nitrogen retention between the two treatments. Nitrogen retention (means +/- SE) remained positive during the HI-PRO trial (2.41 +/- 1.99 g/day) but was significantly (P less than 0.005) reduced to -5.29 +/- 2.58 g/day during the REC-PRO trial. These results suggest that the current protein RDA may be inadequate for athletes engaging in chronic high-intensity endurance exercise. Future studies are needed to confirm this observation.

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Failure of weight training to affect urinary indices of protein metabolism in men

Cited by 31 publications

References 0 publications

Excretion of 3-Methylhistidine and Hydroxyproline Following Acute Weight-Training Exercise

Excretion of 3-Methylhistidine and Hydroxyproline Following Acute Weight-Training Exercise

Spot urinary creatinine excretion in pervasive developmental disorders

Effect of Chronic Endurance Exercise on Retention of Dietary Protein

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