Limits...
Supplemental Protein during Heavy Cycling Training and Recovery Impacts Skeletal Muscle and Heart Rate Responses but Not Performance

View Article: PubMed Central - PubMed

ABSTRACT

The effects of protein supplementation on cycling performance, skeletal muscle function, and heart rate responses to exercise were examined following intensified (ICT) and reduced-volume training (RVT). Seven cyclists performed consecutive periods of normal training (NT), ICT (10 days; average training duration 220% of NT), and RVT (10 days; training duration 66% of NT). In a crossover design, subjects consumed supplemental carbohydrate (CHO) or an equal amount of carbohydrate with added protein (CP) during and following each exercise session (CP = +0.94 g/kg/day protein during ICT; +0.39 g/kg/day during RVT). A 30-kilometer time trial performance (following 120 min at 50% Wmax) was modestly impaired following ICT (+2.4 ± 6.4% versus NT) and returned to baseline levels following RVT (−0.7 ± 4.5% versus NT), with similar responses between CHO and CP. Skeletal muscle torque at 120 deg/s benefited from CP, compared to CHO, following ICT. However, this effect was no longer present at RVT. Following ICT, muscle fiber cross-sectional area was increased with CP, while there were no clear changes with CHO. Reductions in constant-load heart rates (at 50% Wmax) following RVT were likely greater with CP than CHO (−9 ± 9 bpm). Overall it appears that CP supplementation impacted skeletal muscle and heart rate responses during a period of heavy training and recovery, but this did not result in meaningful changes in time trial performance.

No MeSH data available.


Effects of Training Periods and Nutritional Supplementation on Peak Knee Extensor Torque. Within-treatment effects: P-N = Possibly different than NT; L-N = Likely different than NT; P-I = Possibly different than ICT. Between-treatment effects at 120 deg/s: NT-ICT = Likely (% chance of smaller/trivial/larger decrease in torque with CP, compared to CHO = 95/5/1), ICT-RVT = Unclear (32/35/33), NT-RVT = Unclear (59/31/10). Between-treatment effects at 240 deg/s: NT-ICT = Unclear (64/25/11), ICT-RVT = Likely (2/14/84), NT-RVT = Unclear (16/29/55). NT = normal training; ICT = intensified cycle training; RVT = reduced volume training; CHO = carbohydrate supplementation; CP = carbohydrate + protein supplementation.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC5037535&req=5

nutrients-08-00550-f004: Effects of Training Periods and Nutritional Supplementation on Peak Knee Extensor Torque. Within-treatment effects: P-N = Possibly different than NT; L-N = Likely different than NT; P-I = Possibly different than ICT. Between-treatment effects at 120 deg/s: NT-ICT = Likely (% chance of smaller/trivial/larger decrease in torque with CP, compared to CHO = 95/5/1), ICT-RVT = Unclear (32/35/33), NT-RVT = Unclear (59/31/10). Between-treatment effects at 240 deg/s: NT-ICT = Unclear (64/25/11), ICT-RVT = Likely (2/14/84), NT-RVT = Unclear (16/29/55). NT = normal training; ICT = intensified cycle training; RVT = reduced volume training; CHO = carbohydrate supplementation; CP = carbohydrate + protein supplementation.

Mentions: Peak torque values for each training period and nutritional treatment are shown in Figure 4. In general, declines in peak torque from NT to ICT tended to be greater with CHO than with CP. However, treatment differences did not persist following RVT (this interpretation is consistent with order-adjusted analyses to account for effects of treatment order from NT-RVT, as all treatment effects at that time point were unclear).


Supplemental Protein during Heavy Cycling Training and Recovery Impacts Skeletal Muscle and Heart Rate Responses but Not Performance
Effects of Training Periods and Nutritional Supplementation on Peak Knee Extensor Torque. Within-treatment effects: P-N = Possibly different than NT; L-N = Likely different than NT; P-I = Possibly different than ICT. Between-treatment effects at 120 deg/s: NT-ICT = Likely (% chance of smaller/trivial/larger decrease in torque with CP, compared to CHO = 95/5/1), ICT-RVT = Unclear (32/35/33), NT-RVT = Unclear (59/31/10). Between-treatment effects at 240 deg/s: NT-ICT = Unclear (64/25/11), ICT-RVT = Likely (2/14/84), NT-RVT = Unclear (16/29/55). NT = normal training; ICT = intensified cycle training; RVT = reduced volume training; CHO = carbohydrate supplementation; CP = carbohydrate + protein supplementation.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5037535&req=5

nutrients-08-00550-f004: Effects of Training Periods and Nutritional Supplementation on Peak Knee Extensor Torque. Within-treatment effects: P-N = Possibly different than NT; L-N = Likely different than NT; P-I = Possibly different than ICT. Between-treatment effects at 120 deg/s: NT-ICT = Likely (% chance of smaller/trivial/larger decrease in torque with CP, compared to CHO = 95/5/1), ICT-RVT = Unclear (32/35/33), NT-RVT = Unclear (59/31/10). Between-treatment effects at 240 deg/s: NT-ICT = Unclear (64/25/11), ICT-RVT = Likely (2/14/84), NT-RVT = Unclear (16/29/55). NT = normal training; ICT = intensified cycle training; RVT = reduced volume training; CHO = carbohydrate supplementation; CP = carbohydrate + protein supplementation.
Mentions: Peak torque values for each training period and nutritional treatment are shown in Figure 4. In general, declines in peak torque from NT to ICT tended to be greater with CHO than with CP. However, treatment differences did not persist following RVT (this interpretation is consistent with order-adjusted analyses to account for effects of treatment order from NT-RVT, as all treatment effects at that time point were unclear).

View Article: PubMed Central - PubMed

ABSTRACT

The effects of protein supplementation on cycling performance, skeletal muscle function, and heart rate responses to exercise were examined following intensified (ICT) and reduced-volume training (RVT). Seven cyclists performed consecutive periods of normal training (NT), ICT (10 days; average training duration 220% of NT), and RVT (10 days; training duration 66% of NT). In a crossover design, subjects consumed supplemental carbohydrate (CHO) or an equal amount of carbohydrate with added protein (CP) during and following each exercise session (CP = +0.94 g/kg/day protein during ICT; +0.39 g/kg/day during RVT). A 30-kilometer time trial performance (following 120 min at 50% Wmax) was modestly impaired following ICT (+2.4 ± 6.4% versus NT) and returned to baseline levels following RVT (−0.7 ± 4.5% versus NT), with similar responses between CHO and CP. Skeletal muscle torque at 120 deg/s benefited from CP, compared to CHO, following ICT. However, this effect was no longer present at RVT. Following ICT, muscle fiber cross-sectional area was increased with CP, while there were no clear changes with CHO. Reductions in constant-load heart rates (at 50% Wmax) following RVT were likely greater with CP than CHO (−9 ± 9 bpm). Overall it appears that CP supplementation impacted skeletal muscle and heart rate responses during a period of heavy training and recovery, but this did not result in meaningful changes in time trial performance.

No MeSH data available.