ENDURANCE – TRIATHLON – MUSCLE PROTEIN SYNTHESIS – AGING


2 RESEARCH ARTICLES


THE EFFECT OF HIGHER PROTEIN FEEDINGS ON RECOVERY FOLLOWING DOWNHILL RUNNING IN MASTERS TRIATHLETES – 2016


Doering TM1, Reaburn PR, Borges NR, Cox GR, Jenkins DG.
PURPOSE
– Following exercise-induced muscle damage (EIMD), masters athletes take longer to recover than younger athletes
– Purpose: determine effect of higher than recommended post-exercise protein feedings on the recovery of knee extensor peak isometric torque (PIT), perceptions of recovery, and cycling time trial (TT) performance following EIMD in masters triathletes
METHOD
– 8 masters triathletes (52±2 y, VO2max, 51.8±4.2 mL·kg-1·min-1) completed two trials separated by 7 days
– Trials consisted of morning PIT testing and a 30-min downhill run followed by an 8-hour recovery
– During recovery,
(a) a moderate (MPI; 0.3 g·kg-1·bolus-1) 176lbs or 80kg x 0.3 = 24g PRO
(b) a high (0.6 g·kg-1·bolus-1) protein intake (HPI) 176lbs or 80kg = 48g PRO
– 3 bolus feedings at 2 hr intervals commencing immediately post-exercise
– PIT testing and a 7 kJ·kg-1 cycling TT were completed post-intervention
– Perceptions of recovery were assessed pre- and post-exercise
RESULTS 
1. The HPI did not significantly improve recovery compared with MPI
2. However, comparison of within-treatment change shows the HPI provided a moderate beneficial effect, attenuating the loss of afternoon PIT compared to the MPI
3. The HPI provided a large beneficial effect, reducing perceived fatigue over the 8-hour recovery compared to the MPI
4. Despite these effects, cycling performance was unchanged
CONCLUSION
– Doubling the recommended post-exercise protein intake did not significantly improve recovery in masters athletes
– However, HPI provided moderate to large beneficial effects on recovery that may be meaningful following EIMD.


LOWER INTEGRATED MUSCLE PROTEIN SYNTHESIS IN MASTERS COMPARED TO YOUNGER ATHLETES – 2016


Doering, Thomas M.; Jenkins, David G.; Reaburn, Peter R.; Borges, Nattai R.; Hohmann, Erik; Phillips, Stuart M.
PURPOSE:
– To compare the integrated muscle protein synthesis (MPS) rates of masters and younger triathletes over 3 consecutive days of intense endurance training
– Recovery of cycling performance, following muscle-damaging running, was also compared between groups
METHODS:
5 masters (age, 53+/-2 y, VO2max, 55.7+/-6.9 mL·kg-1·min-1) and 6 younger (age, 27+/-2 y, VO2max, 62.3+/-1.5 mL·kg-1·min-1) trained triathletes
They then completed a 30 min downhill run; three 20 km cycling time trials were completed 10, 24 and 48 h following the run
RESULTS:
Over the 3 days, masters triathletes showed a significantly lower myofibrillar fractional synthetic rate
The masters triathletes produced a slower cycle time trial at 10 h post-run, in comparison to baseline
– The between-group comparison of change was moderate, suggesting slower acute recovery among masters triathletes
CONCLUSIONS:
Data shows lower MPS rates in well-trained masters and this likely contributes to poorer muscle protein repair and remodeling
– Acute recovery of cycle time trial performance tended to be poorer in the masters triathletes


 

Comments are closed.