Professor Sam Oliver
Athro mewn Gwyddorau Chwaraeon ac Ymarfer Corff
Contact info
Position: Professor
Email: s.j.oliver@bangor.ac.uk
Phone: (01248) 38 3965
Location: Room 301, George Building, Normal Site
To book a student tutorial please visit: https://outlook.office365.com/owa/calendar/SHESStaffTutorialandDropInHours@bangoroffice365.onmicrosoft.com/bookings/
- 2024
- Wedi ei Dderbyn / Yn y wasg
Thirty years of longitudinal talent development research: A systematic review and meta-aggregation
Lawrence, G., Dunn, E., Gottwald, V., Oliver, S., Roberts, R., Hardy, J. & Woodman, T., 16 Ion 2024, (Wedi ei Dderbyn / Yn y wasg) Yn: International Review of Sport and Exercise Psychology.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- 2023
- Cyhoeddwyd
Greater post-exercise hypotension in healthy young untrained men after exercising in a hot compared to a temperate environment
Horiuchi, M. & Oliver, S., Hyd 2023, Yn: Journal of Thermal Biology. 117, 103683.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- E-gyhoeddi cyn argraffu
Sex differences in iron status during military training: a prospective cohort study of longitudinal changes and associations with endurance performance and musculoskeletal outcomes
O'Leary, T. J., Jackson, S., Izard, R. M., Walsh, N. P., Coombs, C., Carswell, A. T., Oliver, S., Tang, J., Fraser, W. & Greeves, J. P., 21 Medi 2023, (E-gyhoeddi cyn argraffu) Yn: British Journal of Nutrition.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- E-gyhoeddi cyn argraffu
Vitamin D metabolites are associated with musculoskeletal injury in young adults: a prospective cohort study
Carswell, A., O'Leary, T. J., Swinton, P., Jackson, S., Tang, J., Oliver, S., Izard, R. M., Walsh, N. P., Fraser, W. & Greeves, J. P., 1 Awst 2023, (E-gyhoeddi cyn argraffu) Yn: Journal of Bone and Mineral Research.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Hypoxia-induced endothelial dysfunction: Could targeting oxidative stress provide protection?
Rossetti, G., Oliver, S., Sandoo, A. & Macdonald, J., 26 Mai 2023, Yn: Experimental Physiology. 108, 8, t. 1026-1028 3 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Five days of tart cherry supplementation improves exercise performance in normobaric hypoxia
Horiuchi, M., Fukuoka, Y., Koyama, K. & Oliver, S., 12 Ion 2023, Yn: Nutrients. 15, 2, 388.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Control of blood pressure in the cold: Differentiation of skin and skeletal muscle vascular resistance
Mugele, H., Marume, K., Amin, S., Possnig, C., Kuhn, L., Riehl, L., Pieper, R., Schabbehard, E-L., Oliver, S., Gagnon, D. & Lawley, J., 1 Ion 2023, Yn: Experimental Physiology. 108, 1, t. 38-49 12 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Good perceived sleep quality protects against the raised risk of respiratory infection during sleep restriction in young adults
Walsh, N., Kashi, D. S., Edwards, J., Richmond, C., Oliver, S., Roberts, R., Izard, R., Jackson, S. & Greeves, J., Ion 2023, Yn: SLEEP. 46, 1, zsac222.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- 2022
- Cyhoeddwyd
A comparison of medium-term heat acclimation by post-exercise hot water immersion or exercise in the heat: Adaptations, overreaching, and thyroid hormones
McIntyre, R., Zurawlew, M., Mee, J., Walsh, N. & Oliver, S., 1 Tach 2022, Yn: American Journal of Physiology - Regulatory Integrative and Comparative Physiology. 323, 5, t. R601-R615Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Vitamin D metabolites are associated with physical performance in young healthy adults
Carswell, A., Jackson, S., Swinton, P., O'Leary, T. J., Tang, J., Oliver, S., Sale, C., Izard, R. M., Walsh, N., Fraser, W. & Greeves, J., Tach 2022, Yn: Medicine and Science in Sports and Exercise. 54, 11, t. 1982-1989 8 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Hypoxia alters posterior cingulate cortex metabolism during a memory task: a 1H fMRS study
Rogan, M., Friend, A., Rossetti, G. M. K., Edden, R. A. E., Mikkelsen, M., Oliver, S., Macdonald, J. & Mullins, P., 15 Hyd 2022, Yn: Neuroimage. 260, 119397.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Dietary nitrate supplementation effect on dynamic cerebral autoregulation in normoxia and acute hypoxia
Horiuchi, M., Rossetti, G. & Oliver, S., Maw 2022, Yn: Journal of Cerebral Blood Flow and Metabolism. 42, 3, t. 486-494Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- 2021
- Cyhoeddwyd
The influence of short-term high-altitude acclimatization on cerebral and leg tissue oxygenation post orthostasis
Horiuchi, M., Okazaki, K., Asano, K., Friend, A., Rossetti, G. & Oliver, S., Tach 2021, Yn: European Journal of Applied Physiology. 121, 11, t. 3095-3102Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
A comparison of heat acclimation by post-exercise hot water immersion and exercise in the heat
McIntyre, R., Mee, J., Zurawlew, M., Oliver, S., Cox, A. & Walsh, N., 1 Awst 2021, Yn: Journal of Science and Medicine in Sport. 24, 8, t. 729-734Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
The deleterious effects of acute hypoxia on microvascular and large vessel endothelial function
Jones, D., Macdonald, J., Sandoo, A., Oliver, S. & Rossetti, G., 1 Awst 2021, Yn: Experimental Physiology. 106, 8, t. 1699-1709Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Bilateral regional extracranial blood flow regulation to hypoxia and unilateral duplex ultrasound measurement error
Friend, A., Rogan, M., Rossetti, G., Lawley, J., Mullins, P., Sandoo, A., Macdonald, J. & Oliver, S., 1 Gorff 2021, Yn: Experimental Physiology. 106, 7, t. 1535-1548 14 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Influence of Vitamin D Supplementation by Simulated Sunlight or Oral D3 on Respiratory Infection during Military Training
Harrison, S., Oliver, S., Kashi, D., Carswell, A., Edwards, J., Wentz, L., Roberts, R., Tang, J., Izard, R., Jackson, S., Allan, D., Rhodes, L., Fraser, W., Greeves, J. & Walsh, N., 1 Gorff 2021, Yn: Medicine and Science in Sports and Exercise. 53, 7, t. 1505-1516 12 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
The role of dietary nitrate supplementation in neurovascular function
Horiuchi, M., Rossetti, G. & Oliver, S., Gorff 2021, Yn: Neural Regeneration Research. 16, 7, t. 1419-1420 2 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Reversal of neurovascular coupling in the default mode network: Evidence from hypoxia
Rossetti, G., d'Avossa, G., Rogan, M., Macdonald, J., Oliver, S. & Mullins, P., Ebr 2021, Yn: Journal of Cerebral Blood Flow and Metabolism. 41, 4, t. 805–818 14 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Vitamin D and the hepatitis B vaccine response: A prospective cohort study and a randomized, placebo-controlled oral vitamin D3 and simulated sunlight supplementation trial in healthy adults
Kashi, D., Oliver, S., Wentz, L., Roberts, R., Carswell, A., Tang, J., Jackson, S., Izard, R. M., Allan, D., Rhodes, L., Fraser, W., Greeves, J. P. & Walsh, N., Chwef 2021, Yn: European Journal of Nutrition. 60, 1, t. 475-491 17 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Global REACH 2018: Andean highlanders, chronic mountain sickness and the integrative regulation of resting blood pressure
Simpson, L., Meah, V., Steele, A., Gasho, C., Howe, C., Dawkins, T., Busch, S., Oliver, S., Moralez, G., Lawley, J., Tymko, MI., Vizcardo-Galindo, G. A., Figueroa-Mujíca, R. J., Villafuerte, F., Ainslie, P., Stembridge, M., Steinback, C. & Moore, J., 1 Ion 2021, Yn: Experimental Physiology. 106, 1, t. 104-116Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Integrative crosstalk between hypoxia and the cold: old data and new opportunities
Mugele, H., Oliver, S., Gagnon, D. & Lawley, J., 1 Ion 2021, Yn: Experimental Physiology. 106, 1, t. 350-358Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- 2020
- Cyhoeddwyd
Validation of a Noninvasive Assessment of Pulmonary Gas Exchange During Exercise in Hypoxia
Howe, C., MacLeod, D., Wainman, L., Oliver, S. & Ainslie, P., 1 Hyd 2020, Yn: Chest. 158, 4, t. 1644-1650Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Evidence for a physiological role of pulmonary arterial baroreceptors in sympathetic neural activation in healthy humans
Simpson, L., Meah, V., Steele, A., Thapamagar, S., Gasho, C., Anholm, J., Drane, A., Dawkins, T., Busch, S., Oliver, S., Lawley, J., Tymko, M., Ainslie, P., Steinback, C., Stembridge, M. & Moore, J., Maw 2020, Yn: Journal of Physiology. 598, 5, t. 955-965Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Lets go Surfing now, everybody's learning how; attentional strategies on expert and novice surfing performance under both practice and competition conditions
Lawrence, G. P., Virian, J., Oliver, S. J. & Gottwald, V. M., 2020, Yn: European Journal of Sport Science. 20, 2, t. 229-239 11 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- 2019
- Cyhoeddwyd
Hydration marker diagnostic accuracy to identify mild intracellular and extracellular dehydration
Owen, J. A., Fortes, M. B., Ur Rahman, S., Jibani, M., Walsh, N. P. & Oliver, S. J., Tach 2019, Yn: International Journal of Sport Nutrition and Exercise Metabolism. 29, 6, t. 604-611 23 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Preliminary Validation of the Athlete Development Formulation Survey (ADFS)
Dunn, E., Anderson, D., Langham-Walsh, E., Lowery, M., Hardy, L., Lawrence, G., Woodman, T., Gottwald, V., Hardy, J., Roberts, R. & Oliver, S., 18 Hyd 2019.Allbwn ymchwil: Cyfraniad at gynhadledd › Murlen › adolygiad gan gymheiriaid
- Cyhoeddwyd
Baroreflex Control of Sympathetic Vasomotor Activity and Resting Arterial Pressure at High Altitude: Insight from Lowlanders and Sherpa
Simpson, L., Busch, S., Oliver, S., Ainslie, P., Stembridge, M., Steinback, C. & Moore, J., 1 Mai 2019, Yn: Journal of Physiology. 597, 9, t. 2379-2390 12 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Selective Reductions in Pulmonary Artery Pressure Lowers Sympathetic Neural Activity in Healthy Humans at High Altitude
Simpson, L., Steele, A., Meah, V. L., Thapamagar, S., Gasho, C., Drane, A., Oliver, S., Tymko, M. M., Ainslie, P. N., Steinbeck, C. D., Stembridge, M. & Moore, J., 1 Ebr 2019, Yn: Faseb Journal. 33, Supplement 1, 562.6.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Crynodeb Cyfarfod › adolygiad gan gymheiriaid
- Cyhoeddwyd
Sucrose and sodium but not caffeine content influence the retention of beverages in humans under euhydrated conditions
Maughan, R. J., Watson, P., Cordery, P. A., Walsh, N., Oliver, S., Dolci, A., Rodriguez Sanchez, N. & Galloway, S. D., Ion 2019, Yn: International Journal of Sport Nutrition and Exercise Metabolism. 29, 1, t. 51-60Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Initial steps in the validation of the athlete development formulation survey
Langham-Walsh, E., Anderson, D., Dunn, E., Gottwald, V., Hardy, J., Hardy, L., Lawrence, G., Lowery, M., Oliver, S., Roberts, R. & Woodman, T., 2019, Journal of Exercise, Movement, and Sport (SCAPPS refereed abstracts repository). t. 115Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Cyfraniad i Gynhadledd
- 2018
- Cyhoeddwyd
Influence of vitamin D supplementation by sunlight or oral D3 on exercise performance
Carswell, A. T., Oliver, S. J., Wentz, L. M., Kashi, D. S., Roberts, R., Tang, J. C., Izard, R. M., Jackson, S., Allan, D., Rhodes, L. E., Fraser, W. D., Greeves, J. P. & Walsh, N. P., Rhag 2018, Yn: Medicine and Science in Sports and Exercise. 50, 12, t. 2555-2564Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Increased Risk of Upper Respiratory Infection in Military Recruits Who Report Sleeping Less Than 6 h per night
Wentz, L. M., Ward, M. D., Potter, C., Oliver, S. J., Jackson, S., Izard, R. M., Greeves, J. P. & Walsh, N. P., Tach 2018, Yn: Military Medicine. 183, 11-12, t. e699–e704 22 t.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Heb ei Gyhoeddi
A Prospective Study of The Developmental Biographies of Great British Pathway Athletes: Pathway to Podium
Dunn, E., Langham-Walsh, E., Lowery, M., Hardy, L., Lawrence, G., Gottwald, V., Hardy, J., Oliver, S. & Roberts, R., 8 Meh 2018, (Heb ei Gyhoeddi).Allbwn ymchwil: Cyfraniad at gynhadledd › Murlen
- Cyhoeddwyd
The 2018 Lake Louise Acute Mountain Sickness Score
Roach, R. C., Hackett, P. H., Oelz, O., Bärtsch, P., Luks, A. M., MacInnis, M. J., Baillie, J. K., Macdonald, J. & Oliver, S., Maw 2018, Yn: High Altitude Medicine and Biology. 19, 1Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
The influence of an afternoon nap on the endurance performance of trained runners
Blanchfield, A. W., Lewis-Jones, T. M., Wignall, J. R., Roberts, J. B. & Oliver, S. J., 2018, Yn: European Journal of Sport Science. 18, 9, t. 1177-1184Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- 2017
- Cyhoeddwyd
Dietary nitrate supplementation increases acute mountain sickness severity and sense of effort during hypoxic exercise
Rossetti, G., Macdonald, J., Wylie, L. J., Little, S., Newton, V., Wood, B., Hawkins, K., Beddoe, R., Davies, H. E. & Oliver, S., Hyd 2017, Yn: Journal of Applied Physiology. 123, 4, t. 983-992Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
MEDEX2015: Greater sea-level fitness is associated with lower sense of effort during Himalayan trekking without worse Acute Mountain Sickness
Rossetti, G., Macdonald, J., Smith, M., Jackson, A., Callender, N., Newcombe, H. K., Storey, H., Willis, S., van den Beukel, J., Woodward, J., Pollard, J., Wood, B., Newton, V., Virian, J., Haswell, O. & Oliver, S., 1 Meh 2017, Yn: High Altitude Medicine and Biology. 18, 2, t. 152-162Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Unexpected reductions in regional cerebral perfusion during prolonged hypoxia
Lawley, J., Oliver, S., Macdonald, J. & Mullins, P., 1 Ion 2017, Yn: Journal of Physiology. 595, 3, t. 935-947Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- 2016
- Cyhoeddwyd
Anxiety and motor performance: More evidence for the effectiveness of holistic process goals as a solution to the process goal paradox
Mullen, R., Jones, E., Oliver, S. & Hardy, L., 1 Tach 2016, Yn: Psychology of Sport and Exercise. 27, November 2016, t. 142 149 t., 27.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Portable prehospital methods to treat near-hypothermic shivering cold casualties
Raymond-Barker, P., Dolci, A., Oliver, S. J., Brierley, J. L., Raymond-Barker, P. C., Doci, A. & Walsh, N. P., 1 Maw 2016, Yn: Wilderness and Environmental Medicine. 27, 1, t. 125-130Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
A randomized trial to assess the potential of different beverages to affect hydration status: development of a beverage hydration index
Maughan, R. J., Watson, P., Cordery, P. A. A., Walsh, N. P., Oliver, S. J., Dolci, A., Rodriguez-Sanchez, N. & Galloway, S. D. R., Maw 2016, Yn: American Journal of Clinical Nutrition. 103, 3, t. 717-723Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- 2015
- Cyhoeddwyd
Exercise, immune function and respiratory infection: An update on the influence of training and environmental stress
Walsh, N. P. & Oliver, S. J., 8 Rhag 2015, Yn: Immunology and Cell Biology. 94, 2, t. 132-139Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Development of a hydration index: a randomized trial to assess the potential of different beverages to affect hydration status
Oliver, S. J., Walsh, N. P., Maughan, R. J., Watson, P., Cordery, P. A., Dolci, A., Rodriguez-Sanchez, N. & Galloway, S. D., Rhag 2015, Yn: Nutricion Hospitalaria. 32, 2, t. 7Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Response to the Letter to the Editor by Aaron Spital, “Is This Elderly Patient Dehydrated? Diagnostic Accuracy of Hydration Assessment Using Physical Signs, Urine, and Saliva Markers”
Fortes, M., Owen, J., Oliver, S. & Walsh, N. P., 1 Awst 2015, Yn: Journal of the American Medical Directors Association. 16, 8, t. 708Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Two nights of sleep deprivation with or without energy restriction does not impair the thermal response to cold
Oliver, S. J., Smith, A. D., Costa, R. J., Maassen, N., Bilzon, J. L. & Walsh, N. P., 14 Mai 2015, Yn: European Journal of Applied Physiology.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Beetroot Juice Does Not Enhance Altitude Running Performance in Well-Trained Athletes
Arnold, J. T., Oliver, S. J., Lewis-Jones, T. M., Wylie, L. J. & Macdonald, J. H., 4 Chwef 2015, Yn: Applied Physiology, Nutrition, and Metabolism.Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- 2014
- Cyhoeddwyd
Is This Elderly Patient Dehydrated? Diagnostic Accuracy of Hydration Assessment Using Physical Signs, Urine, and Saliva Markers
Fortes, M. B., Owen, J. A., Raymond-Barker, P., Bishop, C., Elghenzai, S., Oliver, S. J. & Walsh, N. P., 22 Hyd 2014, Yn: Journal of the American Medical Directors Association. 16, 3, t. 221-228Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Prolonged (9 h) poikilocapnic hypoxia (12% O2) augments cutaneous thermal hyperaemia in healthy humans
Lawley, J. S., Oliver, S. J., Mullins, P. G., Macdonald, J. H. & Moore, J. P., 1 Meh 2014, Yn: Experimental Physiology. 99, t. 909-920Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
- Cyhoeddwyd
Normobaric hypoxia and symptoms of acute mountain sickness: Elevated brain volume and intracranial hypertension
Lawley, J. S., Alperin, N., Bagci, A. M., Lee, S. H., Mullins, P. G., Oliver, S. J. & Macdonald, J. H., 20 Mai 2014, Yn: Annals of Neurology. 75, 6, t. 890-898Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid