Abstract
This study examined whether consuming collagen peptides (CP) before and after strenuous exercise alters markers of muscle damage, inflammation and bone turnover. Using a double-blind, independent group’s design, 24 recreationally active males consumed either 20 g day−1 of CP or a placebo control (CON) for 7 days before and 2 days after performing 150 drop jumps. Maximal isometric voluntary contractions, countermovement jumps (CMJ), muscle soreness (200 mm visual analogue scale), pressure pain threshold, Brief Assessment of Mood Adapted (BAM +) and a range of blood markers associated with muscle damage, inflammation and bone turnover C-terminal telopeptide of type 1 collagen (β-CTX) and N-terminal propeptides of type 1 pro-collagen (P1NP) were measured before supplementation (baseline; BL), pre, post, 1.5, 24 and 48 h post-exercise. Muscle soreness was not significantly different in CP and CON (P = 0.071) but a large effect size was evident at 48 h post-exercise, indicative of lower soreness in the CP group (90.42 ± 45.33 mm vs. CON 125.67 ± 36.50 mm; ES = 2.64). CMJ height recovered quicker with CP than CON at 48 h (P = 0.050; CP 89.96 ± 12.85 vs. CON 78.67 ± 14.41% of baseline values; ES = 0.55). There were no statistically significant effects for the other dependent variables (P > 0.05). β-CTX and P1NP were unaffected by CP supplementation (P > 0.05). In conclusion, CP had moderate benefits for the recovery of CMJ and muscle soreness but had no influence on inflammation and bone collagen synthesis.
Highlights
Strenuous exercise involving repetitive lengthening muscle contractions can result in ultrastructural damage to the myofibrils and surrounding extracellular matrix (ECM) (Clarkson and Sayers 1999; Hyldahl and Hubal 2014)
There were notable changes in the collagen peptides (CP) vs. CON group at various time points post-exercise; the mean changes, along with the 90% confidence intervals (CI) for these variables are displayed in Tables 2, 3, 4
There was no group × time interaction (P = 0.202) but muscle soreness did tend to be lower in the CP group
Summary
Strenuous exercise involving repetitive lengthening muscle contractions can result in ultrastructural damage to the myofibrils and surrounding extracellular matrix (ECM) (Clarkson and Sayers 1999; Hyldahl and Hubal 2014). This damage manifests as swelling, pain, soreness, and a loss of function in the damaged limbs (Clarkson and Sayers 1999; Hyldahl and Hubal 2014). Tasks required for daily living, such as stair climbing and walking might be affected (Dannecker and Koltyn 2014).
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