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

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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.


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Heart Rate Responses (Mean ± SD) during Constant-Load Cycling (50% Wmax). Within-treatment effects: P-N = Possibly different than NT; L-I = Likely different than ICT. Between-treatment effects: NT-ICT = Unclear (% chance of larger/trivial/smaller attenuation in heart rate with CP, compared to CHO = 51/39/10), ICT-RVT = Possible (74/24/2), NT-RVT = Likely (85/12/2). NT = normal training; ICT = intensified cycle training; RVT = reduced volume training; CHO = carbohydrate supplementation; CP = carbohydrate + protein supplementation.
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nutrients-08-00550-f003: Heart Rate Responses (Mean ± SD) during Constant-Load Cycling (50% Wmax). Within-treatment effects: P-N = Possibly different than NT; L-I = Likely different than ICT. Between-treatment effects: NT-ICT = Unclear (% chance of larger/trivial/smaller attenuation in heart rate with CP, compared to CHO = 51/39/10), ICT-RVT = Possible (74/24/2), NT-RVT = Likely (85/12/2). NT = normal training; ICT = intensified cycle training; RVT = reduced volume training; CHO = carbohydrate supplementation; CP = carbohydrate + protein supplementation.

Mentions: Physiological responses during constant-load cycling were examined at 50% Wmax, corresponding to 57%–62% VO2peak. Heart rate responses are shown in Figure 3. Briefly, heart rate was possibly decreased following ICT with CP, but not altered in CHO. Following RVT, heart rates possibly increased in the CHO condition (versus ICT and NT), while heart rate remained attenuated with CP (versus NT). As a result of these combined effects, reductions in heart rate between NT-RVT with CP were likely greater than CHO.


Supplemental Protein during Heavy Cycling Training and Recovery Impacts Skeletal Muscle and Heart Rate Responses but Not Performance
Heart Rate Responses (Mean ± SD) during Constant-Load Cycling (50% Wmax). Within-treatment effects: P-N = Possibly different than NT; L-I = Likely different than ICT. Between-treatment effects: NT-ICT = Unclear (% chance of larger/trivial/smaller attenuation in heart rate with CP, compared to CHO = 51/39/10), ICT-RVT = Possible (74/24/2), NT-RVT = Likely (85/12/2). 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-f003: Heart Rate Responses (Mean ± SD) during Constant-Load Cycling (50% Wmax). Within-treatment effects: P-N = Possibly different than NT; L-I = Likely different than ICT. Between-treatment effects: NT-ICT = Unclear (% chance of larger/trivial/smaller attenuation in heart rate with CP, compared to CHO = 51/39/10), ICT-RVT = Possible (74/24/2), NT-RVT = Likely (85/12/2). NT = normal training; ICT = intensified cycle training; RVT = reduced volume training; CHO = carbohydrate supplementation; CP = carbohydrate + protein supplementation.
Mentions: Physiological responses during constant-load cycling were examined at 50% Wmax, corresponding to 57%–62% VO2peak. Heart rate responses are shown in Figure 3. Briefly, heart rate was possibly decreased following ICT with CP, but not altered in CHO. Following RVT, heart rates possibly increased in the CHO condition (versus ICT and NT), while heart rate remained attenuated with CP (versus NT). As a result of these combined effects, reductions in heart rate between NT-RVT with CP were likely greater than CHO.

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.


Related in: MedlinePlus